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Merge branch 'master' into master

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This commit is contained in:
Eric Martin
2020-03-13 22:25:15 -05:00
committed by GitHub
parent a3b011434c 76d60ae6ff
commit 339fe359a6
2722 changed files with 48091 additions and 35611 deletions
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1
core-java-modules/core-java-11/README.md
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@@ -13,3 +13,4 @@ This module contains articles about Java 11 core features
- [Guide to jlink](https://www.baeldung.com/jlink)
- [Negate a Predicate Method Reference with Java 11](https://www.baeldung.com/java-negate-predicate-method-reference)
- [Benchmark JDK Collections vs Eclipse Collections](https://www.baeldung.com/jdk-collections-vs-eclipse-collections)
- [Pre-compile Regex Patterns Into Pattern Objects](https://www.baeldung.com/java-regex-pre-compile)

8
core-java-modules/core-java-11/pom.xml
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@@ -42,12 +42,12 @@
<dependency>
<groupId>org.eclipse.collections</groupId>
<artifactId>eclipse-collections</artifactId>
<version>10.0.0</version>
<version>${eclipse.collections.version}</version>
</dependency>
<dependency>
<groupId>org.eclipse.collections</groupId>
<artifactId>eclipse-collections-api</artifactId>
<version>10.0.0</version>
<version>${eclipse.collections.version}</version>
</dependency>
</dependencies>
@@ -65,7 +65,7 @@
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>3.2.1</version>
<version>${shade.plugin.version}</version>
<executions>
<execution>
<phase>package</phase>
@@ -108,6 +108,8 @@
<assertj.version>3.11.1</assertj.version>
<uberjar.name>benchmarks</uberjar.name>
<jmh.version>1.22</jmh.version>
<eclipse.collections.version>10.0.0</eclipse.collections.version>
<shade.plugin.version>10.0.0</shade.plugin.version>
</properties>
</project>

4
core-java-modules/core-java-13/README.md Normal file
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@@ -0,0 +1,4 @@
### Relevant articles:
- [Java Switch Statement](https://www.baeldung.com/java-switch)
- [New Java 13 Features](https://www.baeldung.com/java-13-new-features)

3
core-java-modules/core-java-13/pom.xml
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@@ -41,7 +41,7 @@
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>3.0.0-M3</version>
<version>${surefire.plugin.version}</version>
<configuration>
<argLine>--enable-preview</argLine>
</configuration>
@@ -53,6 +53,7 @@
<maven.compiler.source.version>13</maven.compiler.source.version>
<maven.compiler.target.version>13</maven.compiler.target.version>
<assertj.version>3.6.1</assertj.version>
<surefire.plugin.version>3.0.0-M3</surefire.plugin.version>
</properties>
</project>

27
core-java-modules/core-java-13/src/test/java/com/baeldung/newfeatures/SwitchExpressionsWithYieldUnitTest.java Normal file
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@@ -0,0 +1,27 @@
package com.baeldung.newfeatures;
import static org.junit.Assert.assertEquals;
import org.junit.Test;
public class SwitchExpressionsWithYieldUnitTest {
@Test
@SuppressWarnings("preview")
public void whenSwitchingOnOperationSquareMe_thenWillReturnSquare() {
var me = 4;
var operation = "squareMe";
var result = switch (operation) {
case "doubleMe" -> {
yield me * 2;
}
case "squareMe" -> {
yield me * me;
}
default -> me;
};
assertEquals(16, result);
}
}

39
core-java-modules/core-java-13/src/test/java/com/baeldung/newfeatures/TextBlocksUnitTest.java Normal file
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@@ -0,0 +1,39 @@
package com.baeldung.newfeatures;
import static org.assertj.core.api.Assertions.assertThat;
import org.junit.Test;
public class TextBlocksUnitTest {
private static final String JSON_STRING = "{\r\n" + "\"name\" : \"Baeldung\",\r\n" + "\"website\" : \"https://www.%s.com/\"\r\n" + "}";
@SuppressWarnings("preview")
private static final String TEXT_BLOCK_JSON = """
{
"name" : "Baeldung",
"website" : "https://www.%s.com/"
}
""";
@Test
public void whenTextBlocks_thenStringOperationsWork() {
assertThat(TEXT_BLOCK_JSON.contains("Baeldung")).isTrue();
assertThat(TEXT_BLOCK_JSON.indexOf("www")).isGreaterThan(0);
assertThat(TEXT_BLOCK_JSON.length()).isGreaterThan(0);
}
@SuppressWarnings("removal")
@Test
public void whenTextBlocks_thenFormattedWorksAsFormat() {
assertThat(TEXT_BLOCK_JSON.formatted("baeldung")
.contains("www.baeldung.com")).isTrue();
assertThat(String.format(JSON_STRING, "baeldung")
.contains("www.baeldung.com")).isTrue();
}
}

1
core-java-modules/core-java-14/.mvn/jvm.config Normal file
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@@ -0,0 +1 @@
--enable-preview

7
core-java-modules/core-java-14/README.md Normal file
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@@ -0,0 +1,7 @@
## Core Java 14
This module contains articles about Java 14.
### Relevant articles
- [Guide to the @Serial Annotation in Java 14](https://www.baeldung.com/java-14-serial-annotation)

106
core-java-modules/core-java-14/pom.xml
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@@ -1,52 +1,66 @@
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.baeldung</groupId>
<artifactId>core-java-14</artifactId>
<version>1.0.0-SNAPSHOT</version>
<name>core-java-14</name>
<packaging>jar</packaging>
<url>http://maven.apache.org</url>
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>core-java-14</artifactId>
<name>core-java-14</name>
<packaging>jar</packaging>
<url>http://maven.apache.org</url>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
<relativePath>../../</relativePath>
</parent>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
<relativePath>../../</relativePath>
</parent>
<dependencies>
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<version>${assertj.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-engine</artifactId>
<version>${junit-jupiter.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-api</artifactId>
<version>${junit-jupiter.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${maven-compiler-plugin.version}</version>
<configuration>
<release>${maven.compiler.release}</release>
<compilerArgs>--enable-preview</compilerArgs>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>${surefire.plugin.version}</version>
<configuration>
<argLine>--enable-preview</argLine>
</configuration>
</plugin>
</plugins>
</build>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${maven-compiler-plugin.version}</version>
<configuration>
<source>${maven.compiler.source.version}</source>
<target>${maven.compiler.target.version}</target>
<compilerArgs>
<compilerArg>
--enable-preview
</compilerArg>
</compilerArgs>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>3.0.0-M3</version>
<configuration>
<argLine>--enable-preview</argLine>
</configuration>
</plugin>
</plugins>
</build>
<properties>
<maven.compiler.source.version>14</maven.compiler.source.version>
<maven.compiler.target.version>14</maven.compiler.target.version>
</properties>
<properties>
<maven.compiler.release>14</maven.compiler.release>
<assertj.version>3.6.1</assertj.version>
<maven-compiler-plugin.version>3.8.1</maven-compiler-plugin.version>
<surefire.plugin.version>3.0.0-M3</surefire.plugin.version>
</properties>
</project>

26
core-java-modules/core-java-14/src/main/java/com/baeldung/java14/patternmatchingforinstanceof/PatternMatchingForInstanceOf.java Normal file
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@@ -0,0 +1,26 @@
package com.baeldung.java14.patternmatchingforinstanceof;
public class PatternMatchingForInstanceOf {
public void performAnimalOperations(Animal animal) {
if (animal instanceof Cat cat) {
cat.meow();
} else if(animal instanceof Dog dog) {
dog.woof();
}
}
abstract class Animal {
}
final class Cat extends Animal {
void meow() {
}
}
final class Dog extends Animal {
void woof() {
}
}
}

46
core-java-modules/core-java-14/src/main/java/com/baeldung/java14/textblocks/TextBlocks13.java Normal file
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@@ -0,0 +1,46 @@
package com.baeldung.java14.textblocks;
public class TextBlocks13 {
public String getBlockOfHtml() {
return """
<html>
<body>
<span>example text</span>
</body>
</html>""";
}
public String getNonStandardIndent() {
return """
Indent
""";
}
public String getQuery() {
return """
select "id", "user"
from "table"
""";
}
public String getTextWithCarriageReturns() {
return """
separated with\r
carriage returns""";
}
public String getTextWithEscapes() {
return """
fun with\n
whitespace\t\r
and other escapes \"""
""";
}
public String getFormattedText(String parameter) {
return """
Some parameter: %s
""".formatted(parameter);
}
}

16
core-java-modules/core-java-14/src/main/java/com/baeldung/java14/textblocks/TextBlocks14.java Normal file
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@@ -0,0 +1,16 @@
package com.baeldung.java14.textblocks;
public class TextBlocks14 {
public String getIgnoredNewLines() {
return """
This is a long test which looks to \
have a newline but actually does not""";
}
public String getEscapedSpaces() {
return """
line 1
line 2 \s
""";
}
}

58
core-java-modules/core-java-14/src/main/java/com/baeldung/serial/MySerialClass.java
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@@ -10,41 +10,41 @@ import java.io.Serializable;
/**
* Class showcasing the usage of the Java 14 @Serial annotation.
*
*
* @author Donato Rimenti
*/
public class MySerialClass implements Serializable {
@Serial
private static final ObjectStreamField[] serialPersistentFields = null;
@Serial
private static final long serialVersionUID = 1;
@Serial
private void writeObject(ObjectOutputStream stream) throws IOException {
// ...
}
@Serial
private static final ObjectStreamField[] serialPersistentFields = null;
@Serial
private void readObject(ObjectInputStream stream) throws IOException, ClassNotFoundException {
// ...
}
@Serial
private static final long serialVersionUID = 1;
@Serial
private void readObjectNoData() throws ObjectStreamException {
// ...
}
@Serial
private void writeObject(ObjectOutputStream stream) throws IOException {
// ...
}
@Serial
private Object writeReplace() throws ObjectStreamException {
// ...
return null;
}
@Serial
private void readObject(ObjectInputStream stream) throws IOException, ClassNotFoundException {
// ...
}
@Serial
private Object readResolve() throws ObjectStreamException {
// ...
return null;
}
@Serial
private void readObjectNoData() throws ObjectStreamException {
// ...
}
@Serial
private Object writeReplace() throws ObjectStreamException {
// ...
return null;
}
@Serial
private Object readResolve() throws ObjectStreamException {
// ...
return null;
}
}

33
core-java-modules/core-java-14/src/test/java/com/baeldung/java14/patternmatchingforinstanceof/PatternMatchingForInstanceOfUnitTest.java Normal file
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@@ -0,0 +1,33 @@
package com.baeldung.java14.patternmatchingforinstanceof;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.verify;
import org.junit.jupiter.api.Test;
import com.baeldung.java14.patternmatchingforinstanceof.PatternMatchingForInstanceOf.Cat;
import com.baeldung.java14.patternmatchingforinstanceof.PatternMatchingForInstanceOf.Dog;
class PatternMatchingForInstanceOfUnitTest {
@Test
void givenAnAnimal_whenTypeIsCat_ThenCatGoesMeow() {
Cat animal = mock(Cat.class);
PatternMatchingForInstanceOf instanceOf = new PatternMatchingForInstanceOf();
instanceOf.performAnimalOperations(animal);
verify(animal).meow();
}
@Test
void givenAnAnimal_whenTypeIsDog_ThenDogGoesWoof() {
Dog animal = mock(Dog.class);
PatternMatchingForInstanceOf instanceOf = new PatternMatchingForInstanceOf();
instanceOf.performAnimalOperations(animal);
verify(animal).woof();
}
}

58
core-java-modules/core-java-14/src/test/java/com/baeldung/java14/textblocks/TextBlocks13UnitTest.java Normal file
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@@ -0,0 +1,58 @@
package com.baeldung.java14.textblocks;
import static org.assertj.core.api.Assertions.assertThat;
import org.junit.jupiter.api.Test;
class TextBlocks13UnitTest {
private TextBlocks13 subject = new TextBlocks13();
@Test
void givenAnOldStyleMultilineString_whenComparing_thenEqualsTextBlock() {
String expected = "<html>\n"
+ "\n"
+ " <body>\n"
+ " <span>example text</span>\n"
+ " </body>\n"
+ "</html>";
assertThat(subject.getBlockOfHtml()).isEqualTo(expected);
}
@Test
void givenAnOldStyleString_whenComparing_thenEqualsTextBlock() {
String expected = "<html>\n\n <body>\n <span>example text</span>\n </body>\n</html>";
assertThat(subject.getBlockOfHtml()).isEqualTo(expected);
}
@Test
void givenAnIndentedString_thenMatchesIndentedOldStyle() {
assertThat(subject.getNonStandardIndent()).isEqualTo(" Indent\n");
}
@Test
void givenAMultilineQuery_thenItCanContainUnescapedQuotes() {
assertThat(subject.getQuery()).contains("select \"id\", \"user\"");
}
@Test
void givenAMultilineQuery_thenItEndWithANewline() {
assertThat(subject.getQuery()).endsWith("\n");
}
@Test
void givenATextWithCarriageReturns_thenItContainsBoth() {
assertThat(subject.getTextWithCarriageReturns()).isEqualTo("separated with\r\ncarriage returns");
}
@Test
void givenAStringWithEscapedWhitespace_thenItAppearsInTheResultingString() {
assertThat(subject.getTextWithEscapes()).contains("fun with\n\n")
.contains("whitespace\t\r\n")
.contains("and other escapes \"\"\"");
}
@Test
void givenAFormattedString_thenTheParameterIsReplaced() {
assertThat(subject.getFormattedText("parameter")).contains("Some parameter: parameter");
}
}

21
core-java-modules/core-java-14/src/test/java/com/baeldung/java14/textblocks/TextBlocks14UnitTest.java Normal file
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@@ -0,0 +1,21 @@
package com.baeldung.java14.textblocks;
import static org.assertj.core.api.Assertions.assertThat;
import org.junit.jupiter.api.Test;
class TextBlocks14UnitTest {
private TextBlocks14 subject = new TextBlocks14();
@Test
void givenAStringWithEscapedNewLines_thenTheResultHasNoNewLines() {
String expected = "This is a long test which looks to have a newline but actually does not";
assertThat(subject.getIgnoredNewLines()).isEqualTo(expected);
}
@Test
void givenAStringWithEscapesSpaces_thenTheResultHasLinesEndingWithSpaces() {
String expected = "line 1\nline 2 \n";
assertThat(subject.getEscapedSpaces()).isEqualTo(expected);
}
}

2
core-java-modules/core-java-8-2/README.md
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@@ -3,7 +3,7 @@
This module contains articles about Java 8 core features
### Relevant Articles:
- [Anonymous Classes in Java](https://www.baeldung.com/java-anonymous-classes)
- [How to Delay Code Execution in Java](https://www.baeldung.com/java-delay-code-execution)
- [Run a Java Application from the Command Line](https://www.baeldung.com/java-run-jar-with-arguments)
- [Java 8 Stream skip() vs limit()](https://www.baeldung.com/java-stream-skip-vs-limit)

21
core-java-modules/core-java-8/pom.xml
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@@ -48,25 +48,6 @@
<filtering>true</filtering>
</resource>
</resources>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>${spring-boot-maven-plugin.version}</version>
<executions>
<execution>
<goals>
<goal>repackage</goal>
</goals>
<configuration>
<classifier>spring-boot</classifier>
<mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
<properties>
@@ -74,8 +55,6 @@
<commons-collections4.version>4.1</commons-collections4.version>
<!-- testing -->
<assertj.version>3.6.1</assertj.version>
<!-- plugins -->
<spring-boot-maven-plugin.version>2.0.4.RELEASE</spring-boot-maven-plugin.version>
</properties>
</project>

1
core-java-modules/core-java-9/README.md
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@@ -9,6 +9,7 @@ This module contains articles about Java 9 core features
- [Iterate Through a Range of Dates in Java](https://www.baeldung.com/java-iterate-date-range)
- [Initialize a HashMap in Java](https://www.baeldung.com/java-initialize-hashmap)
- [Immutable Set in Java](https://www.baeldung.com/java-immutable-set)
- [Immutable ArrayList in Java](https://www.baeldung.com/java-immutable-list)
Note: also contains part of the code for the article
[How to Filter a Collection in Java](https://www.baeldung.com/java-collection-filtering).

6
core-java-modules/core-java-9/pom.xml
View File

@@ -37,6 +37,11 @@
<version>${junit.platform.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-collections4</artifactId>
<version>${commons-collections4.version}</version>
</dependency>
</dependencies>
<build>
@@ -69,6 +74,7 @@
<maven.compiler.source>1.9</maven.compiler.source>
<maven.compiler.target>1.9</maven.compiler.target>
<guava.version>25.1-jre</guava.version>
<commons-collections4.version>4.1</commons-collections4.version>
</properties>
</project>

42
core-java-modules/core-java-collections-array-list/src/test/java/org/baeldung/java/collections/CoreJavaCollectionsUnitTest.java → core-java-modules/core-java-9/src/test/java/com/baeldung/java9/list/immutable/ImmutableArrayListUnitTest.java
View File

@@ -1,56 +1,48 @@
package org.baeldung.java.collections;
package com.baeldung.java9.list.immutable;
import com.google.common.collect.ImmutableList;
import org.apache.commons.collections4.ListUtils;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
public class CoreJavaCollectionsUnitTest {
private static final Logger LOG = LoggerFactory.getLogger(CoreJavaCollectionsUnitTest.class);
// tests -
@Test
public final void givenUsingTheJdk_whenArrayListIsSynchronized_thenCorrect() {
final List<String> list = new ArrayList<String>(Arrays.asList("one", "two", "three"));
final List<String> synchronizedList = Collections.synchronizedList(list);
LOG.debug("Synchronized List is: " + synchronizedList);
}
public class ImmutableArrayListUnitTest {
@Test(expected = UnsupportedOperationException.class)
public final void givenUsingTheJdk_whenUnmodifiableListIsCreatedFromOriginal_thenNoLongerModifiable() {
final List<String> list = new ArrayList<String>(Arrays.asList("one", "two", "three"));
public final void givenUsingTheJdk_whenUnmodifiableListIsCreated_thenNotModifiable() {
final List<String> list = new ArrayList<>(Arrays.asList("one", "two", "three"));
final List<String> unmodifiableList = Collections.unmodifiableList(list);
unmodifiableList.add("four");
}
@Test(expected = UnsupportedOperationException.class)
public final void givenUsingGuava_whenUnmodifiableListIsCreatedFromOriginal_thenNoLongerModifiable() {
final List<String> list = new ArrayList<String>(Arrays.asList("one", "two", "three"));
public final void givenUsingTheJava9_whenUnmodifiableListIsCreated_thenNotModifiable() {
final List<String> list = new ArrayList<>(Arrays.asList("one", "two", "three"));
final List<String> unmodifiableList = List.of(list.toArray(new String[]{}));
unmodifiableList.add("four");
}
@Test(expected = UnsupportedOperationException.class)
public final void givenUsingGuava_whenUnmodifiableListIsCreated_thenNotModifiable() {
final List<String> list = new ArrayList<>(Arrays.asList("one", "two", "three"));
final List<String> unmodifiableList = ImmutableList.copyOf(list);
unmodifiableList.add("four");
}
@Test(expected = UnsupportedOperationException.class)
public final void givenUsingGuavaBuilder_whenUnmodifiableListIsCreatedFromOriginal_thenNoLongerModifiable() {
final List<String> list = new ArrayList<String>(Arrays.asList("one", "two", "three"));
public final void givenUsingGuavaBuilder_whenUnmodifiableListIsCreated_thenNoLongerModifiable() {
final List<String> list = new ArrayList<>(Arrays.asList("one", "two", "three"));
final ImmutableList<String> unmodifiableList = ImmutableList.<String>builder().addAll(list).build();
unmodifiableList.add("four");
}
@Test(expected = UnsupportedOperationException.class)
public final void givenUsingCommonsCollections_whenUnmodifiableListIsCreatedFromOriginal_thenNoLongerModifiable() {
final List<String> list = new ArrayList<String>(Arrays.asList("one", "two", "three"));
public final void givenUsingCommonsCollections_whenUnmodifiableListIsCreated_thenNotModifiable() {
final List<String> list = new ArrayList<>(Arrays.asList("one", "two", "three"));
final List<String> unmodifiableList = ListUtils.unmodifiableList(list);
unmodifiableList.add("four");
}
}

1
core-java-modules/core-java-arrays-2/README.md
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@@ -13,4 +13,5 @@ This module contains articles about Java arrays
- [Removing an Element from an Array in Java](https://www.baeldung.com/java-array-remove-element)
- [Removing the First Element of an Array](https://www.baeldung.com/java-array-remove-first-element)
- [Adding an Element to a Java Array vs an ArrayList](https://www.baeldung.com/java-add-element-to-array-vs-list)
- [Arrays.sort vs Arrays.parallelSort](https://www.baeldung.com/java-arrays-sort-vs-parallelsort)
- [[<-- Prev]](/core-java-modules/core-java-arrays)

3
core-java-modules/core-java-arrays-2/pom.xml
View File

@@ -51,7 +51,7 @@
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>3.2.0</version>
<version>${shade.plugin.version}</version>
<executions>
<execution>
<phase>package</phase>
@@ -79,6 +79,7 @@
<commons-lang3.version>3.9</commons-lang3.version>
<!-- testing -->
<assertj-core.version>3.10.0</assertj-core.version>
<shade.plugin.version>3.2.0</shade.plugin.version>
</properties>
</project>

4
core-java-modules/core-java-arrays-2/src/test/java/com/baeldung/arraysort/SortComparisonUnitTest.java
View File

@@ -69,7 +69,7 @@ public class SortComparisonUnitTest {
}
@Test
public void givenArrayOfIntegers_whenUsingArraysSortMethodWithRange_thenSortRangeOfArrayInAscendingOrder() {
public void givenArrayOfIntegers_whenUsingArraysSortWithRange_thenSortRangeOfArrayAsc() {
int[] array = { 10, 4, 6, 2, 1, 9, 7, 8, 3, 5 };
int[] expected = { 10, 4, 1, 2, 6, 7, 8, 9, 3, 5 };
@@ -89,7 +89,7 @@ public class SortComparisonUnitTest {
}
@Test
public void givenArrayOfIntegers_whenUsingArraysParallelSortMethodWithRange_thenSortRangeOfArrayInAscendingOrder() {
public void givenArrayOfIntegers_whenUsingArraysParallelSortWithRange_thenSortRangeOfArrayAsc() {
int[] array = { 10, 4, 6, 2, 1, 9, 7, 8, 3, 5 };
int[] expected = { 10, 4, 1, 2, 6, 7, 8, 9, 3, 5 };

31
core-java-modules/core-java-arrays-3/pom.xml Normal file
View File

@@ -0,0 +1,31 @@
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>core-java-arrays-3</artifactId>
<version>0.1.0-SNAPSHOT</version>
<name>core-java-arrays-3</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
</parent>
<dependencies>
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<version>${assertj.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<properties>
<assertj.version>3.14.0</assertj.version>
</properties>
</project>

96
core-java-modules/core-java-arrays-3/src/test/java/com/baeldung/arrays/deepequals/ArraysDeepEqualsUnitTest.java Normal file
View File

@@ -0,0 +1,96 @@
package com.baeldung.arrays.deepequals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import java.util.Arrays;
import java.util.Objects;
import org.junit.jupiter.api.Test;
public class ArraysDeepEqualsUnitTest {
class Person {
private int id;
private String name;
private int age;
Person(int id, String name, int age) {
this.id = id;
this.name = name;
this.age = age;
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (!(obj instanceof Person))
return false;
Person person = (Person) obj;
return id == person.id && name.equals(person.name) && age == person.age;
}
@Override
public int hashCode() {
return Objects.hash(id, name, age);
}
}
@Test
void givenTwoUnidimensionalObjectTypeArrays_whenUsingEqualsAndDeepEquals_thenBothShouldReturnTrue() {
Object[] anArray = new Object[] { "string1", "string2", "string3" };
Object[] anotherArray = new Object[] { "string1", "string2", "string3" };
assertTrue(Arrays.equals(anArray, anotherArray));
assertTrue(Arrays.deepEquals(anArray, anotherArray));
}
@Test
void givenTwoUnidimensionalObjectTypeArraysWithNullElements_whenUsingEqualsAndDeepEquals_thenBothShouldReturnTrue() {
Object[] anArray = new Object[] { "string1", null, "string3" };
Object[] anotherArray = new Object[] { "string1", null, "string3" };
assertTrue(Arrays.equals(anArray, anotherArray));
assertTrue(Arrays.deepEquals(anArray, anotherArray));
}
@Test
void givenTwoUnidimensionalObjectTypeArraysWithNestedElements_whenUsingEqualsAndDeepEquals_thenShouldReturnDifferently() {
Object[] anArray = new Object[] { "string1", null, new String[] { "nestedString1", "nestedString2" } };
Object[] anotherArray = new Object[] { "string1", null, new String[] { "nestedString1", "nestedString2" } };
assertFalse(Arrays.equals(anArray, anotherArray));
assertTrue(Arrays.deepEquals(anArray, anotherArray));
}
@Test
void givenTwoMultidimensionalPrimitiveTypeArrays_whenUsingEqualsAndDeepEquals_thenBothShouldReturnDifferently() {
int[][] anArray = { { 1, 2, 3 }, { 4, 5, 6, 9 }, { 7 } };
int[][] anotherArray = { { 1, 2, 3 }, { 4, 5, 6, 9 }, { 7 } };
assertFalse(Arrays.equals(anArray, anotherArray));
assertTrue(Arrays.deepEquals(anArray, anotherArray));
}
@Test
void givenTwoMultidimensionalObjectTypeArrays_whenUsingEqualsAndDeepEquals_thenBothShouldReturnDifferently() {
Person personArray1[][] = { { new Person(1, "John", 22), new Person(2, "Mike", 23) }, { new Person(3, "Steve", 27), new Person(4, "Gary", 28) } };
Person personArray2[][] = { { new Person(1, "John", 22), new Person(2, "Mike", 23) }, { new Person(3, "Steve", 27), new Person(4, "Gary", 28) } };
assertFalse(Arrays.equals(personArray1, personArray2));
assertTrue(Arrays.deepEquals(personArray1, personArray2));
}
@Test
void givenTwoMultidimensionalObjectTypeArrays_whenUsingDeepEqualsFromObjectsAndArraysClasses_thenBothShouldReturnTrue() {
Person personArray1[][] = { { new Person(1, "John", 22), new Person(2, "Mike", 23) }, { new Person(3, "Steve", 27), new Person(4, "Gary", 28) } };
Person personArray2[][] = { { new Person(1, "John", 22), new Person(2, "Mike", 23) }, { new Person(3, "Steve", 27), new Person(4, "Gary", 28) } };
assertTrue(Objects.deepEquals(personArray1, personArray2));
assertTrue(Arrays.deepEquals(personArray1, personArray2));
}
}

210
core-java-modules/core-java-arrays/pom.xml
View File

@@ -66,101 +66,7 @@
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>${maven-jar-plugin.version}</version>
<configuration>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<classpathPrefix>libs/</classpathPrefix>
<mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
<configuration>
<archiveBaseDirectory>${project.basedir}</archiveBaseDirectory>
<archive>
<manifest>
<mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
</manifest>
</archive>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>${maven-shade-plugin.version}</version>
<executions>
<execution>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<shadedArtifactAttached>true</shadedArtifactAttached>
<transformers>
<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
</transformer>
</transformers>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>com.jolira</groupId>
<artifactId>onejar-maven-plugin</artifactId>
<version>${onejar-maven-plugin.version}</version>
<executions>
<execution>
<configuration>
<mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
<attachToBuild>true</attachToBuild>
<filename>${project.build.finalName}-onejar.${project.packaging}</filename>
</configuration>
<goals>
<goal>one-jar</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>${spring-boot-maven-plugin.version}</version>
<executions>
<execution>
<goals>
<goal>repackage</goal>
</goals>
<configuration>
<classifier>spring-boot</classifier>
<mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
@@ -183,8 +89,8 @@
<artifactId>maven-javadoc-plugin</artifactId>
<version>${maven-javadoc-plugin.version}</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
<source>${source.version}</source>
<target>${target.version}</target>
</configuration>
</plugin>
</plugins>
@@ -250,110 +156,6 @@
</build>
</profile>
<!-- java instrumentation profiles to build jars -->
<profile>
<id>buildAgentLoader</id>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>jar</goal>
</goals>
<configuration>
<classifier>agentLoader</classifier>
<classesDirectory>target/classes</classesDirectory>
<archive>
<manifest>
<addClasspath>true</addClasspath>
</manifest>
<manifestFile>${project.build.outputDirectory}/META-INF/MANIFEST.MF</manifestFile>
</archive>
<includes>
<include>com/baeldung/instrumentation/application/AgentLoader.class</include>
<include>com/baeldung/instrumentation/application/Launcher.class</include>
</includes>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</profile>
<profile>
<id>buildApplication</id>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>jar</goal>
</goals>
<configuration>
<classifier>application</classifier>
<classesDirectory>target/classes</classesDirectory>
<archive>
<manifest>
<addClasspath>true</addClasspath>
</manifest>
<manifestFile>${project.build.outputDirectory}/META-INF/MANIFEST.MF</manifestFile>
</archive>
<includes>
<include>com/baeldung/instrumentation/application/MyAtm.class</include>
<include>com/baeldung/instrumentation/application/MyAtmApplication.class</include>
<include>com/baeldung/instrumentation/application/Launcher.class</include>
</includes>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</profile>
<profile>
<id>buildAgent</id>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>jar</goal>
</goals>
<configuration>
<classifier>agent</classifier>
<classesDirectory>target/classes</classesDirectory>
<archive>
<manifest>
<addClasspath>true</addClasspath>
</manifest>
<manifestFile>${project.build.outputDirectory}/META-INF/MANIFEST.MF</manifestFile>
</archive>
<includes>
<include>com/baeldung/instrumentation/agent/AtmTransformer.class</include>
<include>com/baeldung/instrumentation/agent/MyInstrumentationAgent.class</include>
</includes>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</profile>
</profiles>
<properties>
@@ -368,11 +170,9 @@
<!-- maven and spring plugins -->
<maven-javadoc-plugin.version>3.0.0-M1</maven-javadoc-plugin.version>
<maven-jar-plugin.version>3.0.2</maven-jar-plugin.version>
<onejar-maven-plugin.version>1.4.4</onejar-maven-plugin.version>
<maven-shade-plugin.version>3.1.1</maven-shade-plugin.version>
<spring-boot-maven-plugin.version>2.0.3.RELEASE</spring-boot-maven-plugin.version>
<exec-maven-plugin.version>1.6.0</exec-maven-plugin.version>
<source.version>1.8</source.version>
<target.version>1.8</target.version>
</properties>
</project>

20
core-java-modules/core-java-arrays/src/main/java/com/baeldung/array/Find2ndLargestInArray.java
View File

@@ -1,20 +0,0 @@
package com.baeldung.array;
public class Find2ndLargestInArray {
public static int find2ndLargestElement(int[] array) {
int maxElement = array[0];
int secondLargestElement = -1;
for (int index = 0; index < array.length; index++) {
if (maxElement <= array[index]) {
secondLargestElement = maxElement;
maxElement = array[index];
} else if (secondLargestElement < array[index]) {
secondLargestElement = array[index];
}
}
return secondLargestElement;
}
}

22
core-java-modules/core-java-arrays/src/main/java/com/baeldung/array/FindElementInArray.java
View File

@@ -1,22 +0,0 @@
package com.baeldung.array;
import java.util.Arrays;
public class FindElementInArray {
public static boolean findGivenElementInArrayWithoutUsingStream(int[] array, int element) {
boolean actualResult = false;
for (int index = 0; index < array.length; index++) {
if (element == array[index]) {
actualResult = true;
break;
}
}
return actualResult;
}
public static boolean findGivenElementInArrayUsingStream(int[] array, int element) {
return Arrays.stream(array).filter(x -> element == x).findFirst().isPresent();
}
}

16
core-java-modules/core-java-arrays/src/test/java/com/baeldung/array/Find2ndLargestInArrayUnitTest.java
View File

@@ -1,16 +0,0 @@
package com.baeldung.array;
import org.junit.Assert;
import org.junit.Test;
public class Find2ndLargestInArrayUnitTest {
@Test
public void givenAnIntArray_thenFind2ndLargestElement() {
int[] array = { 1, 3, 24, 16, 87, 20 };
int expected2ndLargest = 24;
int actualSecondLargestElement = Find2ndLargestInArray.find2ndLargestElement(array);
Assert.assertEquals(expected2ndLargest, actualSecondLargestElement);
}
}

35
core-java-modules/core-java-arrays/src/test/java/com/baeldung/array/FindElementInArrayUnitTest.java
View File

@@ -1,35 +0,0 @@
package com.baeldung.array;
import org.junit.Assert;
import org.junit.Test;
public class FindElementInArrayUnitTest {
@Test
public void givenAnIntArray_whenNotUsingStream_thenFindAnElement() {
int[] array = { 1, 3, 4, 8, 19, 20 };
int element = 19;
boolean expectedResult = true;
boolean actualResult = FindElementInArray.findGivenElementInArrayWithoutUsingStream(array, element);
Assert.assertEquals(expectedResult, actualResult);
element = 78;
expectedResult = false;
actualResult = FindElementInArray.findGivenElementInArrayWithoutUsingStream(array, element);
Assert.assertEquals(expectedResult, actualResult);
}
@Test
public void givenAnIntArray_whenUsingStream_thenFindAnElement() {
int[] array = { 15, 16, 12, 18 };
int element = 16;
boolean expectedResult = true;
boolean actualResult = FindElementInArray.findGivenElementInArrayUsingStream(array, element);
Assert.assertEquals(expectedResult, actualResult);
element = 20;
expectedResult = false;
actualResult = FindElementInArray.findGivenElementInArrayUsingStream(array, element);
Assert.assertEquals(expectedResult, actualResult);
}
}

5
core-java-modules/core-java-collections-array-list/README.md
View File

@@ -3,9 +3,8 @@
This module contains articles about the Java ArrayList collection
### Relevant Articles:
- [Immutable ArrayList in Java](http://www.baeldung.com/java-immutable-list)
- [Guide to the Java ArrayList](http://www.baeldung.com/java-arraylist)
- [Add Multiple Items to an Java ArrayList](http://www.baeldung.com/java-add-items-array-list)
- [Guide to the Java ArrayList](https://www.baeldung.com/java-arraylist)
- [Add Multiple Items to an Java ArrayList](https://www.baeldung.com/java-add-items-array-list)
- [ClassCastException: Arrays$ArrayList cannot be cast to ArrayList](https://www.baeldung.com/java-classcastexception-arrays-arraylist)
- [Multi Dimensional ArrayList in Java](https://www.baeldung.com/java-multi-dimensional-arraylist)
- [Removing an Element From an ArrayList](https://www.baeldung.com/java-arraylist-remove-element)

2
core-java-modules/core-java-collections-array-list/src/test/java/org/baeldung/java/collections/ArrayListUnitTest.java → core-java-modules/core-java-collections-array-list/src/test/java/com/baeldung/collections/ArrayListUnitTest.java
View File

@@ -1,4 +1,4 @@
package org.baeldung.java.collections;
package com.baeldung.collections;
import com.google.common.collect.Sets;
import org.junit.Before;

25
core-java-modules/core-java-collections-array-list/src/test/java/com/baeldung/collections/CoreJavaCollectionsUnitTest.java Normal file
View File

@@ -0,0 +1,25 @@
package com.baeldung.collections;
import com.google.common.collect.ImmutableList;
import org.apache.commons.collections4.ListUtils;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
public class CoreJavaCollectionsUnitTest {
private static final Logger LOG = LoggerFactory.getLogger(CoreJavaCollectionsUnitTest.class);
@Test
public final void givenUsingTheJdk_whenArrayListIsSynchronized_thenCorrect() {
final List<String> list = new ArrayList<>(Arrays.asList("one", "two", "three"));
final List<String> synchronizedList = Collections.synchronizedList(list);
LOG.debug("Synchronized List is: " + synchronizedList);
}
}

8
core-java-modules/core-java-collections-list-2/README.md
View File

@@ -3,13 +3,13 @@
This module contains articles about the Java List collection
### Relevant Articles:
- [Check If Two Lists are Equal in Java](http://www.baeldung.com/java-test-a-list-for-ordinality-and-equality)
- [Check If Two Lists are Equal in Java](https://www.baeldung.com/java-test-a-list-for-ordinality-and-equality)
- [Java 8 Streams: Find Items From One List Based On Values From Another List](https://www.baeldung.com/java-streams-find-list-items)
- [A Guide to the Java LinkedList](http://www.baeldung.com/java-linkedlist)
- [Java List UnsupportedOperationException](http://www.baeldung.com/java-list-unsupported-operation-exception)
- [A Guide to the Java LinkedList](https://www.baeldung.com/java-linkedlist)
- [Java List UnsupportedOperationException](https://www.baeldung.com/java-list-unsupported-operation-exception)
- [Java List Initialization in One Line](https://www.baeldung.com/java-init-list-one-line)
- [Ways to Iterate Over a List in Java](https://www.baeldung.com/java-iterate-list)
- [Flattening Nested Collections in Java](http://www.baeldung.com/java-flatten-nested-collections)
- [Flattening Nested Collections in Java](https://www.baeldung.com/java-flatten-nested-collections)
- [Intersection of Two Lists in Java](https://www.baeldung.com/java-lists-intersection)
- [Searching for a String in an ArrayList](https://www.baeldung.com/java-search-string-arraylist)
- [[<-- Prev]](/core-java-modules/core-java-collections-list)[[Next -->]](/core-java-modules/core-java-collections-list-3)

2
core-java-modules/core-java-collections-list-2/src/test/java/org/baeldung/java/lists/ListAssertJUnitTest.java → core-java-modules/core-java-collections-list-2/src/test/java/com/baeldung/java/list/ListAssertJUnitTest.java
View File

@@ -1,4 +1,4 @@
package org.baeldung.java.lists;
package com.baeldung.java.list;
import org.junit.Test;

2
core-java-modules/core-java-collections-list-2/src/test/java/org/baeldung/java/lists/ListJUnitTest.java → core-java-modules/core-java-collections-list-2/src/test/java/com/baeldung/java/list/ListJUnitTest.java
View File

@@ -1,4 +1,4 @@
package org.baeldung.java.lists;
package com.baeldung.java.list;
import org.junit.Assert;
import org.junit.Test;

2
core-java-modules/core-java-collections-list-2/src/test/java/org/baeldung/java/lists/ListTestNgUnitTest.java → core-java-modules/core-java-collections-list-2/src/test/java/com/baeldung/java/list/ListTestNgUnitTest.java
View File

@@ -1,4 +1,4 @@
package org.baeldung.java.lists;
package com.baeldung.java.list;
import org.junit.Test;

2
core-java-modules/core-java-collections-list-2/src/test/java/org/baeldung/java/lists/README.md
View File

@@ -1,2 +0,0 @@
### Relevant Articles:
- [Check If Two Lists are Equal in Java](http://www.baeldung.com/java-test-a-list-for-ordinality-and-equality)

2
core-java-modules/core-java-collections-list/src/test/java/org/baeldung/java/collections/JavaCollectionCleanupUnitTest.java → core-java-modules/core-java-collections-list/src/test/java/com/baeldung/collections/JavaCollectionCleanupUnitTest.java
View File

@@ -1,4 +1,4 @@
package org.baeldung.java.collections;
package com.baeldung.collections;
import static org.hamcrest.Matchers.hasSize;
import static org.junit.Assert.assertThat;

2
core-java-modules/core-java-collections-list/src/test/java/org/baeldung/RandomListElementUnitTest.java → core-java-modules/core-java-collections-list/src/test/java/com/baeldung/list/random/RandomListElementUnitTest.java
View File

@@ -1,4 +1,4 @@
package org.baeldung;
package com.baeldung.list.random;
import com.google.common.collect.Lists;
import org.junit.Test;

19
core-java-modules/core-java-concurrency-advanced-2/src/main/java/com/baeldung/threadlocalrandom/ThreadLocalRandomBenchMarkRunner.java
View File

@@ -1,22 +1,27 @@
package com.baeldung.threadlocalrandom;
import org.openjdk.jmh.runner.Runner;
import org.openjdk.jmh.runner.options.Options;
import org.openjdk.jmh.runner.options.ChainedOptionsBuilder;
import org.openjdk.jmh.runner.options.OptionsBuilder;
import com.google.common.collect.ImmutableList;
public class ThreadLocalRandomBenchMarkRunner {
public static void main(String[] args) throws Exception {
Options options = new OptionsBuilder().include(ThreadLocalRandomBenchMarker.class.getSimpleName())
.threads(1)
ChainedOptionsBuilder options = new OptionsBuilder().include(ThreadLocalRandomBenchMarker.class.getSimpleName())
.forks(1)
.shouldFailOnError(true)
.shouldDoGC(true)
.jvmArgs("-server")
.build();
new Runner(options).run();
.jvmArgs("-server");
for (Integer i : ImmutableList.of(1, 2, 8, 32)) {
new Runner(
options
.threads(i)
.build())
.run();
}
}
}

48
core-java-modules/core-java-concurrency-advanced-2/src/main/java/com/baeldung/threadlocalrandom/ThreadLocalRandomBenchMarker.java
View File

@@ -1,64 +1,34 @@
package com.baeldung.threadlocalrandom;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadLocalRandom;
import java.util.concurrent.TimeUnit;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Level;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.annotations.Warmup;
@BenchmarkMode(Mode.AverageTime)
@BenchmarkMode(Mode.Throughput)
@Warmup(iterations = 1)
@OutputTimeUnit(TimeUnit.MICROSECONDS)
@State(Scope.Benchmark)
public class ThreadLocalRandomBenchMarker {
private final Random random = new Random();
List<Callable<Integer>> randomCallables = new ArrayList<>();
List<Callable<Integer>> threadLocalRandomCallables = new ArrayList<>();
@Setup(Level.Iteration)
public void init() {
Random random = new Random();
randomCallables = new ArrayList<>();
threadLocalRandomCallables = new ArrayList<>();
for (int i = 0; i < 1000; i++) {
randomCallables.add(() -> {
return random.nextInt();
});
}
for (int i = 0; i < 1000; i++) {
threadLocalRandomCallables.add(() -> {
return ThreadLocalRandom.current()
.nextInt();
});
}
@Benchmark
public int randomValuesUsingRandom() {
return random.nextInt();
}
@Benchmark
public void randomValuesUsingRandom() throws InterruptedException {
ExecutorService executor = Executors.newWorkStealingPool();
executor.invokeAll(randomCallables);
executor.shutdown();
}
@Benchmark
public void randomValuesUsingThreadLocalRandom() throws InterruptedException {
ExecutorService executor = Executors.newWorkStealingPool();
executor.invokeAll(threadLocalRandomCallables);
executor.shutdown();
public int randomValuesUsingThreadLocalRandom() {
return ThreadLocalRandom
.current()
.nextInt();
}
}

4
core-java-modules/core-java-concurrency-advanced-3/README.md
View File

@@ -8,4 +8,6 @@ This module contains articles about advanced topics about multithreading with co
- [Common Concurrency Pitfalls in Java](https://www.baeldung.com/java-common-concurrency-pitfalls)
- [Guide to RejectedExecutionHandler](https://www.baeldung.com/java-rejectedexecutionhandler)
[[<-- previous]](/core-java-modules/core-java-concurrency-advanced-2)
- [Guide to Work Stealing in Java](https://www.baeldung.com/java-work-stealing)
- [Asynchronous Programming in Java](https://www.baeldung.com/java-asynchronous-programming)
- [[<-- previous]](/core-java-modules/core-java-concurrency-advanced-2)

85
core-java-modules/core-java-concurrency-advanced-3/src/main/java/com/baeldung/workstealing/PrimeNumbers.java Normal file
View File

@@ -0,0 +1,85 @@
package com.baeldung.workstealing;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.ForkJoinTask;
import java.util.concurrent.RecursiveAction;
import java.util.concurrent.atomic.AtomicInteger;
public class PrimeNumbers extends RecursiveAction {
private int lowerBound;
private int upperBound;
private int granularity;
static final List<Integer> GRANULARITIES
= Arrays.asList(1, 10, 100, 1000, 10000);
private AtomicInteger noOfPrimeNumbers;
PrimeNumbers(int lowerBound, int upperBound, int granularity, AtomicInteger noOfPrimeNumbers) {
this.lowerBound = lowerBound;
this.upperBound = upperBound;
this.granularity = granularity;
this.noOfPrimeNumbers = noOfPrimeNumbers;
}
PrimeNumbers(int upperBound) {
this(1, upperBound, 100, new AtomicInteger(0));
}
private PrimeNumbers(int lowerBound, int upperBound, AtomicInteger noOfPrimeNumbers) {
this(lowerBound, upperBound, 100, noOfPrimeNumbers);
}
private List<PrimeNumbers> subTasks() {
List<PrimeNumbers> subTasks = new ArrayList<>();
for (int i = 1; i <= this.upperBound / granularity; i++) {
int upper = i * granularity;
int lower = (upper - granularity) + 1;
subTasks.add(new PrimeNumbers(lower, upper, noOfPrimeNumbers));
}
return subTasks;
}
@Override
protected void compute() {
if (((upperBound + 1) - lowerBound) > granularity) {
ForkJoinTask.invokeAll(subTasks());
} else {
findPrimeNumbers();
}
}
void findPrimeNumbers() {
for (int num = lowerBound; num <= upperBound; num++) {
if (isPrime(num)) {
noOfPrimeNumbers.getAndIncrement();
}
}
}
private boolean isPrime(int number) {
if (number == 2) {
return true;
}
if (number == 1 || number % 2 == 0) {
return false;
}
int noOfNaturalNumbers = 0;
for (int i = 1; i <= number; i++) {
if (number % i == 0) {
noOfNaturalNumbers++;
}
}
return noOfNaturalNumbers == 2;
}
public int noOfPrimeNumbers() {
return noOfPrimeNumbers.intValue();
}
}

15
core-java-modules/core-java-concurrency-advanced-3/src/test/java/com/baeldung/rejection/SaturationPolicyUnitTest.java
View File

@@ -1,6 +1,7 @@
package com.baeldung.rejection;
import org.junit.After;
import org.junit.Ignore;
import org.junit.Test;
import java.util.ArrayList;
@@ -28,24 +29,26 @@ public class SaturationPolicyUnitTest {
}
}
@Ignore
@Test
public void givenAbortPolicy_WhenSaturated_ThenShouldThrowRejectedExecutionException() {
executor = new ThreadPoolExecutor(1, 1, 0, MILLISECONDS, new SynchronousQueue<>(), new AbortPolicy());
executor.execute(() -> waitFor(100));
executor.execute(() -> waitFor(250));
assertThatThrownBy(() -> executor.execute(() -> System.out.println("Will be rejected"))).isInstanceOf(RejectedExecutionException.class);
}
@Ignore
@Test
public void givenCallerRunsPolicy_WhenSaturated_ThenTheCallerThreadRunsTheTask() {
executor = new ThreadPoolExecutor(1, 1, 0, MILLISECONDS, new SynchronousQueue<>(), new CallerRunsPolicy());
executor.execute(() -> waitFor(100));
executor.execute(() -> waitFor(250));
long startTime = System.nanoTime();
executor.execute(() -> waitFor(100));
double blockedDuration = (System.nanoTime() - startTime) / 1_000_000.0;
long startTime = System.currentTimeMillis();
executor.execute(() -> waitFor(500));
long blockedDuration = System.currentTimeMillis() - startTime;
assertThat(blockedDuration).isGreaterThanOrEqualTo(100);
assertThat(blockedDuration).isGreaterThanOrEqualTo(500);
}
@Test

101
core-java-modules/core-java-concurrency-advanced-3/src/test/java/com/baeldung/workstealing/PrimeNumbersUnitManualTest.java Normal file
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@@ -0,0 +1,101 @@
package com.baeldung.workstealing;
import org.junit.Test;
import org.openjdk.jmh.annotations.*;
import org.openjdk.jmh.runner.Runner;
import org.openjdk.jmh.runner.RunnerException;
import org.openjdk.jmh.runner.options.Options;
import org.openjdk.jmh.runner.options.OptionsBuilder;
import java.util.concurrent.Executors;
import java.util.concurrent.ForkJoinPool;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.logging.Logger;
import static org.junit.Assert.fail;
public class PrimeNumbersUnitManualTest {
private static Logger logger = Logger.getAnonymousLogger();
@Test
public void givenPrimesCalculated_whenUsingPoolsAndOneThread_thenOneThreadSlowest() {
Options opt = new OptionsBuilder()
.include(Benchmarker.class.getSimpleName())
.forks(1)
.build();
try {
new Runner(opt).run();
} catch (RunnerException e) {
fail();
}
}
@Test
public void givenNewWorkStealingPool_whenGettingPrimes_thenStealCountChanges() {
StringBuilder info = new StringBuilder();
for (int granularity : PrimeNumbers.GRANULARITIES) {
int parallelism = ForkJoinPool.getCommonPoolParallelism();
ForkJoinPool pool =
(ForkJoinPool) Executors.newWorkStealingPool(parallelism);
stealCountInfo(info, granularity, pool);
}
logger.info("\nExecutors.newWorkStealingPool ->" + info.toString());
}
@Test
public void givenCommonPool_whenGettingPrimes_thenStealCountChangesSlowly() {
StringBuilder info = new StringBuilder();
for (int granularity : PrimeNumbers.GRANULARITIES) {
ForkJoinPool pool = ForkJoinPool.commonPool();
stealCountInfo(info, granularity, pool);
}
logger.info("\nForkJoinPool.commonPool ->" + info.toString());
}
private void stealCountInfo(StringBuilder info, int granularity, ForkJoinPool forkJoinPool) {
PrimeNumbers primes = new PrimeNumbers(1, 10000, granularity, new AtomicInteger(0));
forkJoinPool.invoke(primes);
forkJoinPool.shutdown();
long steals = forkJoinPool.getStealCount();
String output = "\nGranularity: [" + granularity + "], Steals: [" + steals + "]";
info.append(output);
}
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.MILLISECONDS)
@State(Scope.Benchmark)
@Fork(value = 2, warmups = 1, jvmArgs = {"-Xms2G", "-Xmx2G"})
public static class Benchmarker {
@Benchmark
public void singleThread() {
PrimeNumbers primes = new PrimeNumbers(10000);
primes.findPrimeNumbers(); // get prime numbers using a single thread
}
@Benchmark
public void commonPoolBenchmark() {
PrimeNumbers primes = new PrimeNumbers(10000);
ForkJoinPool pool = ForkJoinPool.commonPool();
pool.invoke(primes);
pool.shutdown();
}
@Benchmark
public void newWorkStealingPoolBenchmark() {
PrimeNumbers primes = new PrimeNumbers(10000);
int parallelism = ForkJoinPool.getCommonPoolParallelism();
ForkJoinPool stealer = (ForkJoinPool) Executors.newWorkStealingPool(parallelism);
stealer.invoke(primes);
stealer.shutdown();
}
}
}

2
core-java-modules/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/volatilekeyword/SharedObject.java
View File

@@ -4,7 +4,7 @@ package com.baeldung.concurrent.volatilekeyword;
public class SharedObject {
private volatile int count=0;
void increamentCount(){
void incrementCount(){
count++;
}
public int getCount(){

6
core-java-modules/core-java-concurrency-advanced/src/test/java/com/baeldung/concurrent/volatilekeyword/SharedObjectManualTest.java
View File

@@ -10,7 +10,7 @@ public class SharedObjectManualTest {
public void whenOneThreadWrites_thenVolatileReadsFromMainMemory() throws InterruptedException {
SharedObject sharedObject = new SharedObject();
Thread writer = new Thread(() -> sharedObject.increamentCount());
Thread writer = new Thread(() -> sharedObject.incrementCount());
writer.start();
Thread.sleep(100);
@@ -31,11 +31,11 @@ public class SharedObjectManualTest {
@Test
public void whenTwoThreadWrites_thenVolatileReadsFromMainMemory() throws InterruptedException {
SharedObject sharedObject = new SharedObject();
Thread writerOne = new Thread(() -> sharedObject.increamentCount());
Thread writerOne = new Thread(() -> sharedObject.incrementCount());
writerOne.start();
Thread.sleep(100);
Thread writerTwo = new Thread(() -> sharedObject.increamentCount());
Thread writerTwo = new Thread(() -> sharedObject.incrementCount());
writerTwo.start();
Thread.sleep(100);

2
core-java-modules/core-java-concurrency-collections/src/test/java/org/baeldung/java/streams/ThreadPoolInParallelStreamIntegrationTest.java → core-java-modules/core-java-concurrency-collections/src/test/java/com/baeldung/java/stream/ThreadPoolInParallelStreamIntegrationTest.java
View File

@@ -1,4 +1,4 @@
package org.baeldung.java.streams;
package com.baeldung.java.stream;
import org.junit.Test;

1
core-java-modules/core-java-date-operations-2/README.md
View File

@@ -6,4 +6,5 @@ This module contains articles about date operations in Java.
- [Skipping Weekends While Adding Days to LocalDate in Java 8](https://www.baeldung.com/java-localdate-add-days-skip-weekends)
- [Checking If Two Java Dates Are on the Same Day](https://www.baeldung.com/java-check-two-dates-on-same-day)
- [Converting Java Date to OffsetDateTime](https://www.baeldung.com/java-convert-date-to-offsetdatetime)
- [How to Set the JVM Time Zone](https://www.baeldung.com/java-jvm-time-zone)
- [[<-- Prev]](/core-java-modules/core-java-date-operations-1)

8
core-java-modules/core-java-date-operations-2/src/test/java/com/baeldung/offsetdatetime/ConvertToOffsetDateTimeUnitTest.java
View File

@@ -4,6 +4,7 @@ import org.junit.Test;
import java.time.OffsetDateTime;
import java.util.Date;
import java.util.TimeZone;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
@@ -18,12 +19,19 @@ public class ConvertToOffsetDateTimeUnitTest {
@Test
public void givenDate_whenHasOffset_thenConvertWithOffset() {
TimeZone prevTimezone = TimeZone.getDefault();
TimeZone.setDefault(TimeZone.getTimeZone("UTC"));
Date date = new Date();
date.setHours(6);
date.setMinutes(30);
OffsetDateTime odt = ConvertToOffsetDateTime.convert(date, 3, 30);
assertEquals(10, odt.getHour());
assertEquals(0, odt.getMinute());
// Reset the timezone to its original value to prevent side effects
TimeZone.setDefault(prevTimezone);
}
}

3
core-java-modules/core-java-datetime-java8-2/README.md Normal file
View File

@@ -0,0 +1,3 @@
### Relevant Articles:
- [Creating a LocalDate with Values in Java](https://www.baeldung.com/java-creating-localdate-with-values)

72
core-java-modules/core-java-datetime-java8-2/pom.xml Normal file
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@@ -0,0 +1,72 @@
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>core-java-datetime-java8</artifactId>
<version>${project.parent.version}</version>
<name>core-java-datetime-java8</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
</parent>
<dependencies>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>${commons-lang3.version}</version>
</dependency>
<dependency>
<groupId>joda-time</groupId>
<artifactId>joda-time</artifactId>
<version>${joda-time.version}</version>
</dependency>
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<version>${assertj.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>${log4j.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<finalName>core-java-datetime-java8</finalName>
<resources>
<resource>
<directory>src/main/resources</directory>
<filtering>true</filtering>
</resource>
</resources>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${maven-compiler-plugin.version}</version>
<configuration>
<source>${maven.compiler.source}</source>
<target>${maven.compiler.target}</target>
</configuration>
</plugin>
</plugins>
</build>
<properties>
<maven.compiler.source>1.9</maven.compiler.source>
<maven.compiler.target>1.9</maven.compiler.target>
<joda-time.version>2.10</joda-time.version>
<!-- testing -->
<assertj.version>3.6.1</assertj.version>
</properties>
</project>

31
core-java-modules/core-java-datetime-java8-2/src/main/java/com/baeldung/localdate/LocalDateExample.java Normal file
View File

@@ -0,0 +1,31 @@
package com.baeldung.localdate;
import java.time.LocalDate;
import java.time.Month;
import java.time.format.DateTimeFormatter;
public class LocalDateExample {
public LocalDate getCustomDateOne(int year, int month, int dayOfMonth) {
return LocalDate.of(year, month, dayOfMonth);
}
public LocalDate getCustomDateTwo(int year, Month month, int dayOfMonth) {
return LocalDate.of(year, month, dayOfMonth);
}
public LocalDate getDateFromEpochDay(long epochDay) {
return LocalDate.ofEpochDay(epochDay);
}
public LocalDate getDateFromYearAndDayOfYear(int year, int dayOfYear) {
return LocalDate.ofYearDay(year, dayOfYear);
}
public LocalDate getDateFromString(String date) {
return LocalDate.parse(date);
}
public LocalDate getDateFromStringAndFormatter(String date, String pattern) {
return LocalDate.parse(date, DateTimeFormatter.ofPattern(pattern));
}
}

33
core-java-modules/core-java-datetime-java8/src/test/java/com/baeldung/datebasics/CreateDateUnitTest.java → core-java-modules/core-java-datetime-java8-2/src/test/java/com/baeldung/localdate/LocalDateExampleUnitTest.java
View File

@@ -1,4 +1,4 @@
package com.baeldung.datebasics;
package com.baeldung.localdate;
import static org.junit.Assert.assertEquals;
@@ -6,49 +6,34 @@ import java.time.Month;
import org.junit.Test;
public class CreateDateUnitTest {
private CreateDate date = new CreateDate();
@Test
public void whenUsingNowMethod_thenLocalDate() {
assertEquals("2020-01-08", date.getTodaysDate());
}
@Test
public void whenUsingClock_thenLocalDate() {
assertEquals("2020-01-08", date.getTodaysDateFromClock());
}
@Test
public void givenValues_whenUsingZone_thenLocalDate() {
assertEquals("2020-01-08", date.getTodaysDateFromZone("Asia/Kolkata"));
}
public class LocalDateExampleUnitTest {
private LocalDateExample date = new LocalDateExample();
@Test
public void givenValues_whenUsingOfMethod_thenLocalDate() {
assertEquals("2020-01-08", date.getCustomDateOne(2020, 1, 8));
}
@Test
public void givenValuesWithMonthEnum_whenUsingOfMethod_thenLocalDate() {
assertEquals("2020-01-08", date.getCustomDateTwo(2020, Month.JANUARY, 8));
}
@Test
public void givenValues_whenUsingEpochDay_thenLocalDate() {
assertEquals("2020-01-08", date.getDateFromEpochDay(18269));
}
@Test
public void givenValues_whenUsingYearDay_thenLocalDate() {
assertEquals("2020-01-08", date.getDateFromYearAndDayOfYear(2020, 8));
}
@Test
public void givenValues_whenUsingParse_thenLocalDate() {
assertEquals("2020-01-08", date.getDateFromString("2020-01-08"));
}
@Test
public void givenValuesWithFormatter_whenUsingParse_thenLocalDate() {
assertEquals("2020-01-08", date.getDateFromStringAndFormatter("8-Jan-2020", "d-MMM-yyyy"));

45
core-java-modules/core-java-datetime-java8/src/main/java/com/baeldung/datebasics/CreateDate.java
View File

@@ -1,45 +0,0 @@
package com.baeldung.datebasics;
import java.time.Clock;
import java.time.LocalDate;
import java.time.Month;
import java.time.ZoneId;
import java.time.format.DateTimeFormatter;
public class CreateDate {
public LocalDate getTodaysDate() {
return LocalDate.now();
}
public LocalDate getTodaysDateFromClock() {
return LocalDate.now(Clock.systemDefaultZone());
}
public LocalDate getTodaysDateFromZone(String zone) {
return LocalDate.now(ZoneId.of(zone));
}
public LocalDate getCustomDateOne(int year, int month, int dayOfMonth) {
return LocalDate.of(year, month, dayOfMonth);
}
public LocalDate getCustomDateTwo(int year, Month month, int dayOfMonth) {
return LocalDate.of(year, month, dayOfMonth);
}
public LocalDate getDateFromEpochDay(long epochDay) {
return LocalDate.ofEpochDay(epochDay);
}
public LocalDate getDateFromYearAndDayOfYear(int year, int dayOfYear) {
return LocalDate.ofYearDay(year, dayOfYear);
}
public LocalDate getDateFromString(String date) {
return LocalDate.parse(date);
}
public LocalDate getDateFromStringAndFormatter(String date, String pattern) {
return LocalDate.parse(date, DateTimeFormatter.ofPattern(pattern));
}
}

6
core-java-modules/core-java-exceptions-2/README.md
View File

@@ -2,4 +2,8 @@
This module contains articles about core java exceptions
###
### Relevant Articles:
- [Is It a Bad Practice to Catch Throwable?](https://www.baeldung.com/java-catch-throwable-bad-practice)
- [Wrapping vs Rethrowing Exceptions in Java](https://www.baeldung.com/java-wrapping-vs-rethrowing-exceptions)
- [java.net.UnknownHostException: Invalid Hostname for Server](https://www.baeldung.com/java-unknownhostexception)

12
core-java-modules/core-java-exceptions-2/pom.xml
View File

@@ -13,12 +13,24 @@
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
</parent>
<dependencies>
<!-- test scoped -->
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<version>${assertj-core.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<description> </description>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<!-- testing -->
<assertj-core.version>3.10.0</assertj-core.version>
</properties>
</project>

28
core-java-modules/core-java-exceptions-2/src/main/java/com/baeldung/exceptions/UnknownHostExceptionHandling.java Normal file
View File

@@ -0,0 +1,28 @@
package com.baeldung.exceptions;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.UnknownHostException;
public class UnknownHostExceptionHandling {
public static int getResponseCode(String hostname) throws IOException {
URL url = new URL(hostname.trim());
HttpURLConnection con = (HttpURLConnection) url.openConnection();
int resCode = -1;
try {
resCode = con.getResponseCode();
} catch (UnknownHostException e){
con.disconnect();
}
return resCode;
}
public static int getResponseCodeUnhandled(String hostname) throws IOException {
URL url = new URL(hostname.trim());
HttpURLConnection con = (HttpURLConnection) url.openConnection();
int resCode = con.getResponseCode();
return resCode;
}
}

32
core-java-modules/core-java-exceptions-2/src/main/java/com/baeldung/socketexception/SocketClient.java Normal file
View File

@@ -0,0 +1,32 @@
package com.baeldung.socketexception;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
public class SocketClient {
private Socket clientSocket;
private PrintWriter out;
private BufferedReader in;
public void startConnection(String ip, int port) throws IOException {
clientSocket = new Socket(ip, port);
out = new PrintWriter(clientSocket.getOutputStream(), true);
in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
}
public String sendMessage(String msg) throws IOException {
out.println(msg);
return in.readLine();
}
public void stopConnection() throws IOException {
in.close();
out.close();
clientSocket.close();
}
}

45
core-java-modules/core-java-exceptions-2/src/main/java/com/baeldung/socketexception/SocketServer.java Normal file
View File

@@ -0,0 +1,45 @@
package com.baeldung.socketexception;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
public class SocketServer {
private ServerSocket serverSocket;
private Socket clientSocket;
private PrintWriter out;
private BufferedReader in;
public void start(int port) {
try {
serverSocket = new ServerSocket(port);
clientSocket = serverSocket.accept();
out = new PrintWriter(clientSocket.getOutputStream(), true);
in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
String msg = in.readLine();
if (msg.contains("hi"))
out.println("hi");
else
out.println("didn't understand");
close();
stop();
} catch (IOException e) {
}
}
private void close() throws IOException {
in.close();
out.close();
}
private void stop() throws IOException {
clientSocket.close();
serverSocket.close();
}
}

13
core-java-modules/core-java-exceptions-2/src/main/java/com/baeldung/suppressed/ExceptionalResource.java Normal file
View File

@@ -0,0 +1,13 @@
package com.baeldung.suppressed;
public class ExceptionalResource implements AutoCloseable {
public void processSomething() {
throw new IllegalArgumentException("Thrown from processSomething()");
}
@Override
public void close() throws Exception {
throw new NullPointerException("Thrown from close()");
}
}

44
core-java-modules/core-java-exceptions-2/src/main/java/com/baeldung/suppressed/SuppressedExceptionsDemo.java Normal file
View File

@@ -0,0 +1,44 @@
package com.baeldung.suppressed;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
public class SuppressedExceptionsDemo {
public static void demoSuppressedException(String filePath) throws IOException {
FileInputStream fileIn = null;
try {
fileIn = new FileInputStream(filePath);
} catch (FileNotFoundException e) {
throw new IOException(e);
} finally {
fileIn.close();
}
}
public static void demoAddSuppressedException(String filePath) throws IOException {
Throwable firstException = null;
FileInputStream fileIn = null;
try {
fileIn = new FileInputStream(filePath);
} catch (IOException e) {
firstException = e;
} finally {
try {
fileIn.close();
} catch (NullPointerException npe) {
if (firstException != null) {
npe.addSuppressed(firstException);
}
throw npe;
}
}
}
public static void demoExceptionalResource() throws Exception {
try (ExceptionalResource exceptionalResource = new ExceptionalResource()) {
exceptionalResource.processSomething();
}
}
}

15
core-java-modules/core-java-exceptions-2/src/test/java/com/baeldung/exceptions/UnknownHostExceptionHandlingUnitTest.java Normal file
View File

@@ -0,0 +1,15 @@
package com.baeldung.exceptions;
import java.io.IOException;
import java.net.UnknownHostException;
import org.junit.Test;
public class UnknownHostExceptionHandlingUnitTest {
@Test(expected = UnknownHostException.class)
public void givenUnknownHost_whenResolve_thenUnknownHostException() throws IOException {
UnknownHostExceptionHandling.getResponseCodeUnhandled("http://locaihost");
}
}

31
core-java-modules/core-java-exceptions-2/src/test/java/com/baeldung/socketexception/SocketExceptionHandlingUnitTest.java Normal file
View File

@@ -0,0 +1,31 @@
package com.baeldung.socketexception;
import java.io.IOException;
import java.net.SocketException;
import java.util.concurrent.Executors;
import org.junit.BeforeClass;
import org.junit.Test;
public class SocketExceptionHandlingUnitTest {
@BeforeClass
public static void runServer() throws IOException, InterruptedException {
Executors.newSingleThreadExecutor()
.submit(() -> new SocketServer().start(6699));
Thread.sleep(100);
}
@Test
public void givenRunningServer_whenConnectToClosedSocket_thenHandleException() throws IOException {
SocketClient client = new SocketClient();
client.startConnection("127.0.0.1", 6699);
try {
client.sendMessage("hi");
client.sendMessage("hi again");
} catch (SocketException e) {
client.stopConnection();
}
}
}

42
core-java-modules/core-java-exceptions-2/src/test/java/com/baeldung/suppressed/SuppressedExceptionsUnitTest.java Normal file
View File

@@ -0,0 +1,42 @@
package com.baeldung.suppressed;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertThat;
import java.io.FileNotFoundException;
import java.io.IOException;
import org.junit.Test;
import static org.hamcrest.CoreMatchers.instanceOf;
public class SuppressedExceptionsUnitTest {
@Test(expected = NullPointerException.class)
public void givenNonExistentFileName_whenAttemptFileOpen_thenNullPointerException() throws IOException {
SuppressedExceptionsDemo.demoSuppressedException("/non-existent-path/non-existent-file.txt");
}
@Test
public void givenNonExistentFileName_whenAttemptFileOpenStoreSuppressed_thenSuppressedExceptionAvailable() {
try {
SuppressedExceptionsDemo.demoAddSuppressedException("/non-existent-path/non-existent-file.txt");
} catch (Exception e) {
assertThat(e, instanceOf(NullPointerException.class));
assertEquals(1, e.getSuppressed().length);
assertThat(e.getSuppressed()[0], instanceOf(FileNotFoundException.class));
}
}
@Test
public void whenUsingExceptionalResource_thenSuppressedExceptionAvailable() {
try {
SuppressedExceptionsDemo.demoExceptionalResource();
} catch (Exception e) {
assertThat(e, instanceOf(IllegalArgumentException.class));
assertEquals("Thrown from processSomething()", e.getMessage());
assertEquals(1, e.getSuppressed().length);
assertThat(e.getSuppressed()[0], instanceOf(NullPointerException.class));
assertEquals("Thrown from close()", e.getSuppressed()[0].getMessage());
}
}
}

2
core-java-modules/core-java-io-2/README.md
View File

@@ -11,5 +11,5 @@ This module contains articles about core Java input and output (IO)
- [List Files in a Directory in Java](https://www.baeldung.com/java-list-directory-files)
- [Java – Append Data to a File](https://www.baeldung.com/java-append-to-file)
- [How to Copy a File with Java](https://www.baeldung.com/java-copy-file)
- [Create a Directory in Java](https://www.baeldung.com/java-create-directory)
- [Create a Directory in Java](https://www.baeldung.com/java-create-directory)
- [[<-- Prev]](/core-java-modules/core-java-io)

2
core-java-modules/core-java-io-apis/src/test/java/com/baeldung/file/FileClassUnitTest.java
View File

@@ -1,5 +1,6 @@
package com.baeldung.file;
import org.junit.Ignore;
import org.junit.Test;
import java.io.*;
@@ -73,6 +74,7 @@ public class FileClassUnitTest {
assertFalse(writable);
}
@Ignore
@Test
public void givenWriteOnlyFile_whenCreateNewFile_thenCantReadFile() {
File parentDir = makeDir("writeDir");

1
core-java-modules/core-java-io/README.md
View File

@@ -13,4 +13,5 @@ This module contains articles about core Java input and output (IO)
- [Getting a File’s Mime Type in Java](https://www.baeldung.com/java-file-mime-type)
- [How to Write to a CSV File in Java](https://www.baeldung.com/java-csv)
- [How to Avoid the Java FileNotFoundException When Loading Resources](https://www.baeldung.com/java-classpath-resource-cannot-be-opened)
- [Create a Directory in Java](https://www.baeldung.com/java-create-directory)
- [[More -->]](/core-java-modules/core-java-io-2)

134
core-java-modules/core-java-io/src/test/java/com/baeldung/readfile/FileOperationsManualTest.java
View File

@@ -1,134 +0,0 @@
package com.baeldung.readfile;
import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;
import org.hamcrest.CoreMatchers;
import org.hamcrest.Matchers;
import org.junit.Test;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLConnection;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertThat;
public class FileOperationsManualTest {
@Test
public void givenFileName_whenUsingClassloader_thenFileData() throws IOException {
String expectedData = "Hello World from fileTest.txt!!!";
ClassLoader classLoader = getClass().getClassLoader();
File file = new File(classLoader.getResource("fileTest.txt").getFile());
InputStream inputStream = new FileInputStream(file);
String data = readFromInputStream(inputStream);
assertEquals(expectedData, data.trim());
}
@Test
public void givenFileNameAsAbsolutePath_whenUsingClasspath_thenFileData() throws IOException {
String expectedData = "Hello World from fileTest.txt!!!";
Class clazz = FileOperationsManualTest.class;
InputStream inputStream = clazz.getResourceAsStream("/fileTest.txt");
String data = readFromInputStream(inputStream);
assertEquals(expectedData, data.trim());
}
@Test
public void givenFileName_whenUsingJarFile_thenFileData() throws IOException {
String expectedData = "MIT License";
Class clazz = Matchers.class;
InputStream inputStream = clazz.getResourceAsStream("/LICENSE.txt");
String data = readFromInputStream(inputStream);
assertThat(data.trim(), CoreMatchers.containsString(expectedData));
}
@Test
public void givenURLName_whenUsingURL_thenFileData() throws IOException {
String expectedData = "Example Domain";
URL urlObject = new URL("http://www.example.com/");
URLConnection urlConnection = urlObject.openConnection();
InputStream inputStream = urlConnection.getInputStream();
String data = readFromInputStream(inputStream);
assertThat(data.trim(), CoreMatchers.containsString(expectedData));
}
@Test
public void givenFileName_whenUsingFileUtils_thenFileData() throws IOException {
String expectedData = "Hello World from fileTest.txt!!!";
ClassLoader classLoader = getClass().getClassLoader();
File file = new File(classLoader.getResource("fileTest.txt").getFile());
String data = FileUtils.readFileToString(file, "UTF-8");
assertEquals(expectedData, data.trim());
}
@Test
public void givenFilePath_whenUsingFilesReadAllBytes_thenFileData() throws IOException, URISyntaxException {
String expectedData = "Hello World from fileTest.txt!!!";
Path path = Paths.get(getClass().getClassLoader().getResource("fileTest.txt").toURI());
byte[] fileBytes = Files.readAllBytes(path);
String data = new String(fileBytes);
assertEquals(expectedData, data.trim());
}
@Test
public void givenFilePath_whenUsingFilesLines_thenFileData() throws IOException, URISyntaxException {
String expectedData = "Hello World from fileTest.txt!!!";
Path path = Paths.get(getClass().getClassLoader().getResource("fileTest.txt").toURI());
Stream<String> lines = Files.lines(path);
String data = lines.collect(Collectors.joining("\n"));
lines.close();
assertEquals(expectedData, data.trim());
}
private String readFromInputStream(InputStream inputStream) throws IOException {
StringBuilder resultStringBuilder = new StringBuilder();
try (BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream))) {
String line;
while ((line = bufferedReader.readLine()) != null) {
resultStringBuilder.append(line).append("\n");
}
}
return resultStringBuilder.toString();
}
@Test
public void givenFileName_whenUsingIOUtils_thenFileData() throws IOException {
String expectedData = "This is a content of the file";
FileInputStream fis = new FileInputStream("src/test/resources/fileToRead.txt");
String data = IOUtils.toString(fis, "UTF-8");
assertEquals(expectedData, data.trim());
}
}

202
core-java-modules/core-java-io/src/test/java/com/baeldung/readfile/JavaReadFromFileUnitTest.java
View File

@@ -1,11 +1,15 @@
package com.baeldung.readfile;
import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;
import org.hamcrest.CoreMatchers;
import org.hamcrest.Matchers;
import org.junit.Test;
import org.junit.Ignore;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.*;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLConnection;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.charset.Charset;
@@ -13,55 +17,148 @@ import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Scanner;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
public class JavaReadFromFileUnitTest {
private static final Logger LOG = LoggerFactory.getLogger(JavaReadFromFileUnitTest.class);
@Test
public void whenReadWithBufferedReader_thenCorrect() throws IOException {
final String expected_value = "Hello world";
final String expected_value = "Hello, world!";
final BufferedReader reader = new BufferedReader(new FileReader("src/test/resources/test_read.in"));
final BufferedReader reader = new BufferedReader(new FileReader("src/test/resources/fileTest.txt"));
final String currentLine = reader.readLine();
reader.close();
assertEquals(expected_value, currentLine);
}
@Test
public void givenFileName_whenUsingClassloader_thenFileData() throws IOException {
String expectedData = "Hello, world!";
ClassLoader classLoader = getClass().getClassLoader();
File file = new File(classLoader.getResource("fileTest.txt").getFile());
InputStream inputStream = new FileInputStream(file);
String data = readFromInputStream(inputStream);
assertEquals(expectedData, data.trim());
}
@Test
public void givenFileNameAsAbsolutePath_whenUsingClasspath_thenFileData() throws IOException {
String expectedData = "Hello, world!";
Class clazz = JavaReadFromFileUnitTest.class;
InputStream inputStream = clazz.getResourceAsStream("/fileTest.txt");
String data = readFromInputStream(inputStream);
assertEquals(expectedData, data.trim());
}
@Test
public void givenFileName_whenUsingJarFile_thenFileData() throws IOException {
String expectedData = "BSD License";
Class clazz = Matchers.class;
InputStream inputStream = clazz.getResourceAsStream("/LICENSE.txt");
String data = readFromInputStream(inputStream);
assertThat(data.trim(), CoreMatchers.containsString(expectedData));
}
@Test
public void givenURLName_whenUsingURL_thenFileData() throws IOException {
String expectedData = "Example Domain";
URL urlObject = new URL("http://www.example.com/");
URLConnection urlConnection = urlObject.openConnection();
InputStream inputStream = urlConnection.getInputStream();
String data = readFromInputStream(inputStream);
assertThat(data.trim(), CoreMatchers.containsString(expectedData));
}
@Test
public void givenFileName_whenUsingFileUtils_thenFileData() throws IOException {
String expectedData = "Hello, world!";
ClassLoader classLoader = getClass().getClassLoader();
File file = new File(classLoader.getResource("fileTest.txt").getFile());
String data = FileUtils.readFileToString(file, "UTF-8");
assertEquals(expectedData, data.trim());
}
@Test
public void givenFilePath_whenUsingFilesReadAllBytes_thenFileData() throws IOException, URISyntaxException {
String expectedData = "Hello, world!";
Path path = Paths.get(getClass().getClassLoader().getResource("fileTest.txt").toURI());
byte[] fileBytes = Files.readAllBytes(path);
String data = new String(fileBytes);
assertEquals(expectedData, data.trim());
}
@Test
public void givenFilePath_whenUsingFilesLines_thenFileData() throws IOException, URISyntaxException {
String expectedData = "Hello, world!";
Path path = Paths.get(getClass().getClassLoader().getResource("fileTest.txt").toURI());
Stream<String> lines = Files.lines(path);
String data = lines.collect(Collectors.joining("\n"));
lines.close();
assertEquals(expectedData, data.trim());
}
@Test
public void givenFileName_whenUsingIOUtils_thenFileData() throws IOException {
String expectedData = "Hello, world!";
FileInputStream fis = new FileInputStream("src/test/resources/fileTest.txt");
String data = IOUtils.toString(fis, "UTF-8");
assertEquals(expectedData, data.trim());
}
@Test
public void whenReadWithScanner_thenCorrect() throws IOException {
final Scanner scanner = new Scanner(new File("src/test/resources/test_read1.in"));
final Scanner scanner = new Scanner(new File("src/test/resources/fileTest.txt"));
scanner.useDelimiter(" ");
assertTrue(scanner.hasNext());
assertEquals("Hello", scanner.next());
assertEquals("world", scanner.next());
assertEquals(1, scanner.nextInt());
assertEquals("Hello,", scanner.next());
assertEquals("world!", scanner.next());
scanner.close();
}
@Test
public void whenReadWithScannerTwoDelimiters_thenCorrect() throws IOException {
final Scanner scanner = new Scanner(new File("src/test/resources/test_read2.in"));
scanner.useDelimiter(",| ");
final Scanner scanner = new Scanner(new File("src/test/resources/fileTest.txt"));
scanner.useDelimiter("\\s|,");
assertTrue(scanner.hasNextInt());
assertEquals(2, scanner.nextInt());
assertEquals(3, scanner.nextInt());
assertEquals(4, scanner.nextInt());
assertTrue(scanner.hasNext());
assertEquals("Hello", scanner.next());
assertEquals("", scanner.next());
assertEquals("world!", scanner.next());
scanner.close();
}
@Test
public void whenReadWithStreamTokenizer_thenCorrectTokens() throws IOException {
final FileReader reader = new FileReader("src/test/resources/test_read3.in");
final FileReader reader = new FileReader("src/test/resources/fileTestTokenizer.txt");
final StreamTokenizer tokenizer = new StreamTokenizer(reader);
tokenizer.nextToken();
@@ -78,49 +175,36 @@ public class JavaReadFromFileUnitTest {
@Test
public void whenReadWithDataInputStream_thenCorrect() throws IOException {
final String expected_value = "Hello";
String expectedValue = "Hello, world!";
String file ="src/test/resources/fileTest.txt";
String result;
final DataInputStream reader = new DataInputStream(new FileInputStream("src/test/resources/test_read4.in"));
result = reader.readUTF();
reader.close();
String result = null;
assertEquals(expected_value, result);
}
DataInputStream reader = new DataInputStream(new FileInputStream(file));
int nBytesToRead = reader.available();
if(nBytesToRead > 0) {
byte[] bytes = new byte[nBytesToRead];
reader.read(bytes);
result = new String(bytes);
}
public void whenReadTwoFilesWithSequenceInputStream_thenCorrect() throws IOException {
final int expected_value1 = 2000;
final int expected_value2 = 5000;
final FileInputStream stream1 = new FileInputStream("src/test/resources/test_read5.in");
final FileInputStream stream2 = new FileInputStream("src/test/resources/test_read6.in");
final SequenceInputStream sequence = new SequenceInputStream(stream1, stream2);
final DataInputStream reader = new DataInputStream(sequence);
assertEquals(expected_value1, reader.readInt());
assertEquals(expected_value2, reader.readInt());
reader.close();
stream2.close();
assertEquals(expectedValue, result);
}
@Test
@Ignore // TODO
public void whenReadUTFEncodedFile_thenCorrect() throws IOException {
final String expected_value = "青空";
final BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream("src/test/resources/test_read7.in"), "UTF-8"));
final BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream("src/test/resources/fileTestUtf8.txt"), "UTF-8"));
final String currentLine = reader.readLine();
reader.close();
LOG.debug(currentLine);
assertEquals(expected_value, currentLine);
}
@Test
public void whenReadFileContentsIntoString_thenCorrect() throws IOException {
final String expected_value = "Hello world \n Test line \n";
final BufferedReader reader = new BufferedReader(new FileReader("src/test/resources/test_read8.in"));
final String expected_value = "Hello, world!\n";
final BufferedReader reader = new BufferedReader(new FileReader("src/test/resources/fileTest.txt"));
final StringBuilder builder = new StringBuilder();
String currentLine = reader.readLine();
while (currentLine != null) {
@@ -136,8 +220,8 @@ public class JavaReadFromFileUnitTest {
@Test
public void whenReadWithFileChannel_thenCorrect() throws IOException {
final String expected_value = "Hello world";
final RandomAccessFile reader = new RandomAccessFile("src/test/resources/test_read.in", "r");
final String expected_value = "Hello, world!";
final RandomAccessFile reader = new RandomAccessFile("src/test/resources/fileTest.txt", "r");
final FileChannel channel = reader.getChannel();
int bufferSize = 1024;
@@ -154,8 +238,8 @@ public class JavaReadFromFileUnitTest {
@Test
public void whenReadSmallFileJava7_thenCorrect() throws IOException {
final String expected_value = "Hello world";
final Path path = Paths.get("src/test/resources/test_read.in");
final String expected_value = "Hello, world!";
final Path path = Paths.get("src/test/resources/fileTest.txt");
final String read = Files.readAllLines(path, Charset.defaultCharset()).get(0);
assertEquals(expected_value, read);
@@ -163,12 +247,24 @@ public class JavaReadFromFileUnitTest {
@Test
public void whenReadLargeFileJava7_thenCorrect() throws IOException {
final String expected_value = "Hello world";
final String expected_value = "Hello, world!";
final Path path = Paths.get("src/test/resources/test_read.in");
final Path path = Paths.get("src/test/resources/fileTest.txt");
final BufferedReader reader = Files.newBufferedReader(path, Charset.defaultCharset());
final String line = reader.readLine();
assertEquals(expected_value, line);
}
private String readFromInputStream(InputStream inputStream) throws IOException {
StringBuilder resultStringBuilder = new StringBuilder();
try (BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream))) {
String line;
while ((line = bufferedReader.readLine()) != null) {
resultStringBuilder.append(line).append("\n");
}
}
return resultStringBuilder.toString();
}
}

2
core-java-modules/core-java-io/src/test/resources/fileTest.txt
View File

@@ -1 +1 @@
Hello World from fileTest.txt!!!
Hello, world!

0
core-java-modules/core-java-io/src/test/resources/test_read3.in → core-java-modules/core-java-io/src/test/resources/fileTestTokenizer.txt
View File

0
core-java-modules/core-java-io/src/test/resources/test_read7.in → core-java-modules/core-java-io/src/test/resources/fileTestUtf8.txt
View File

1
core-java-modules/core-java-io/src/test/resources/test_read1.in
View File

@@ -1 +0,0 @@
Hello world 1

1
core-java-modules/core-java-io/src/test/resources/test_read2.in
View File

@@ -1 +0,0 @@
2,3 4

BIN
core-java-modules/core-java-io/src/test/resources/test_read4.in
View File

Binary file not shown.

2
core-java-modules/core-java-io/src/test/resources/test_read8.in
View File

@@ -1,2 +0,0 @@
Hello world
Test line

16
core-java-modules/core-java-jar/pom.xml
View File

@@ -99,7 +99,7 @@
<manifest>
<addClasspath>true</addClasspath>
<classpathPrefix>libs/</classpathPrefix>
<mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
<mainClass>com.baeldung.executable.ExecutableMavenJar</mainClass>
</manifest>
</archive>
</configuration>
@@ -118,7 +118,7 @@
<archiveBaseDirectory>${project.basedir}</archiveBaseDirectory>
<archive>
<manifest>
<mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
<mainClass>com.baeldung.executable.ExecutableMavenJar</mainClass>
</manifest>
</archive>
<descriptorRefs>
@@ -142,7 +142,7 @@
<shadedArtifactAttached>true</shadedArtifactAttached>
<transformers>
<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
<mainClass>com.baeldung.executable.ExecutableMavenJar</mainClass>
</transformer>
</transformers>
</configuration>
@@ -157,7 +157,7 @@
<executions>
<execution>
<configuration>
<mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
<mainClass>com.baeldung.executable.ExecutableMavenJar</mainClass>
<attachToBuild>true</attachToBuild>
<filename>${project.build.finalName}-onejar.${project.packaging}</filename>
</configuration>
@@ -179,7 +179,7 @@
</goals>
<configuration>
<classifier>spring-boot</classifier>
<mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
<mainClass>com.baeldung.executable.ExecutableMavenJar</mainClass>
</configuration>
</execution>
</executions>
@@ -207,8 +207,8 @@
<artifactId>maven-javadoc-plugin</artifactId>
<version>${maven-javadoc-plugin.version}</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
<source>${source.version}</source>
<target>${target.version}</target>
</configuration>
</plugin>
</plugins>
@@ -397,6 +397,8 @@
<maven-shade-plugin.version>3.1.1</maven-shade-plugin.version>
<spring-boot-maven-plugin.version>2.0.3.RELEASE</spring-boot-maven-plugin.version>
<exec-maven-plugin.version>1.6.0</exec-maven-plugin.version>
<source.version>1.8</source.version>
<target.version>1.8</target.version>
</properties>
</project>

40
core-java-modules/core-java-jndi/pom.xml
View File

@@ -9,44 +9,54 @@
<name>core-java-jndi</name>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
<relativePath>../../</relativePath>
</parent>
<dependencies>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter</artifactId>
<version>5.5.1</version>
<version>${jupiter.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-api</artifactId>
<version>${jupiter.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-engine</artifactId>
<version>${jupiter.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>5.0.9.RELEASE</version>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.0.9.RELEASE</version>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.0.9.RELEASE</version>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>5.0.9.RELEASE</version>
<version>${spring.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<version>1.4.199</version>
<version>${h2.version}</version>
</dependency>
</dependencies>
@@ -56,11 +66,19 @@
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
<source>${source.version}</source>
<target>${target.version}</target>
</configuration>
</plugin>
</plugins>
</build>
<properties>
<spring.version>5.0.9.RELEASE</spring.version>
<h2.version>1.4.199</h2.version>
<jupiter.version>5.5.1</jupiter.version>
<source.version>1.8</source.version>
<target.version>1.8</target.version>
</properties>
</project>

13
core-java-modules/core-java-jndi/src/test/java/com/baeldung/jndi/exceptions/JndiExceptionsUnitTest.java
View File

@@ -1,5 +1,12 @@
package com.baeldung.jndi.exceptions;
import static org.junit.jupiter.api.Assertions.assertThrows;
import javax.naming.InitialContext;
import javax.naming.NameNotFoundException;
import javax.naming.NoInitialContextException;
import org.junit.jupiter.api.Disabled;
import org.junit.jupiter.api.MethodOrderer;
import org.junit.jupiter.api.Order;
import org.junit.jupiter.api.Test;
@@ -7,12 +14,6 @@ import org.junit.jupiter.api.TestMethodOrder;
import org.springframework.jndi.JndiTemplate;
import org.springframework.mock.jndi.SimpleNamingContextBuilder;
import javax.naming.InitialContext;
import javax.naming.NameNotFoundException;
import javax.naming.NoInitialContextException;
import static org.junit.jupiter.api.Assertions.assertThrows;
@TestMethodOrder(MethodOrderer.OrderAnnotation.class)
public class JndiExceptionsUnitTest {

6
core-java-modules/core-java-jpms/decoupling-pattern1/consumermodule/pom.xml
View File

@@ -16,7 +16,7 @@
<dependency>
<groupId>com.baeldung.servicemodule</groupId>
<artifactId>servicemodule</artifactId>
<version>1.0</version>
<version>${servicemodule.version}</version>
</dependency>
</dependencies>
@@ -29,4 +29,8 @@
</plugins>
</build>
<properties>
<servicemodule.version>1.0</servicemodule.version>
</properties>
</project>

9
core-java-modules/core-java-jpms/decoupling-pattern1/pom.xml
View File

@@ -19,10 +19,10 @@
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.0</version>
<version>${compiler.plugin.version}</version>
<configuration>
<source>11</source>
<target>11</target>
<source>${source.version}</source>
<target>${target.version}</target>
</configuration>
</plugin>
</plugins>
@@ -31,6 +31,9 @@
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<compiler.plugin.version>3.8.0</compiler.plugin.version>
<source.version>11</source.version>
<target.version>11</target.version>
</properties>
</project>

1
core-java-modules/core-java-jpms/decoupling-pattern1/servicemodule/pom.xml
View File

@@ -2,7 +2,6 @@
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.baeldung.servicemodule</groupId>
<artifactId>servicemodule</artifactId>
<packaging>jar</packaging>

13
core-java-modules/core-java-jpms/decoupling-pattern2/consumermodule/pom.xml
View File

@@ -8,8 +8,8 @@
<version>1.0</version>
<parent>
<groupId>decoupling-pattern2</groupId>
<artifactId>com.baeldung.decoupling-pattern2</artifactId>
<groupId>com.baeldung.decoupling-pattern2</groupId>
<artifactId>decoupling-pattern2</artifactId>
<version>1.0-SNAPSHOT</version>
</parent>
@@ -17,12 +17,12 @@
<dependency>
<groupId>com.baeldung.servicemodule</groupId>
<artifactId>servicemodule</artifactId>
<version>1.0</version>
<version>${servicemodule.version}</version>
</dependency>
<dependency>
<groupId>com.baeldung.providermodule</groupId>
<artifactId>providermodule</artifactId>
<version>1.0</version>
<version>${providermodule.version}</version>
</dependency>
</dependencies>
@@ -34,5 +34,10 @@
</plugin>
</plugins>
</build>
<properties>
<servicemodule.version>1.0</servicemodule.version>
<providermodule.version>1.0</providermodule.version>
</properties>
</project>

12
core-java-modules/core-java-jpms/decoupling-pattern2/pom.xml
View File

@@ -20,14 +20,20 @@
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.0</version>
<version>${compiler.plugin.version}</version>
<configuration>
<source>11</source>
<target>11</target>
<source>${source.version}</source>
<target>${target.version}</target>
</configuration>
</plugin>
</plugins>
</pluginManagement>
</build>
<properties>
<compiler.plugin.version>3.8.0</compiler.plugin.version>
<source.version>11</source.version>
<target.version>11</target.version>
</properties>
</project>

11
core-java-modules/core-java-jpms/decoupling-pattern2/providermodule/pom.xml
View File

@@ -8,8 +8,8 @@
<version>1.0</version>
<parent>
<groupId>decoupling-pattern2</groupId>
<artifactId>com.baeldung.decoupling-pattern2</artifactId>
<groupId>com.baeldung.decoupling-pattern2</groupId>
<artifactId>decoupling-pattern2</artifactId>
<version>1.0-SNAPSHOT</version>
</parent>
@@ -17,7 +17,7 @@
<dependency>
<groupId>com.baeldung.servicemodule</groupId>
<artifactId>servicemodule</artifactId>
<version>1.0</version>
<version>${servicemodule.version}</version>
</dependency>
</dependencies>
@@ -30,4 +30,9 @@
</plugins>
</build>
<properties>
<servicemodule.version>1.0</servicemodule.version>
</properties>
</project>

5
core-java-modules/core-java-jpms/decoupling-pattern2/servicemodule/pom.xml
View File

@@ -3,13 +3,12 @@
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.baeldung.servicemodule</groupId>
<artifactId>servicemodule</artifactId>
<version>1.0</version>
<parent>
<groupId>decoupling-pattern2</groupId>
<artifactId>>com.baeldung.decoupling-pattern2</artifactId>
<groupId>com.baeldung.decoupling-pattern2</groupId>
<artifactId>decoupling-pattern2</artifactId>
<version>1.0-SNAPSHOT</version>
</parent>

21
core-java-modules/core-java-jpms/pom.xml Normal file
View File

@@ -0,0 +1,21 @@
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>core-java-jpms</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>core-java-jpms</name>
<packaging>pom</packaging>
<parent>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
</parent>
<modules>
<module>decoupling-pattern1</module>
<module>decoupling-pattern2</module>
</modules>
</project>

2
core-java-modules/core-java-jvm/README.md
View File

@@ -10,3 +10,5 @@ This module contains articles about working with the Java Virtual Machine (JVM).
- [Class Loaders in Java](https://www.baeldung.com/java-classloaders)
- [A Guide to System.exit()](https://www.baeldung.com/java-system-exit)
- [Guide to System.gc()](https://www.baeldung.com/java-system-gc)
- [Runtime.getRuntime().halt() vs System.exit() in Java](https://www.baeldung.com/java-runtime-halt-vs-system-exit)
- [Adding Shutdown Hooks for JVM Applications](https://www.baeldung.com/jvm-shutdown-hooks)

2
core-java-modules/core-java-jvm/src/test/java/com/baeldung/exitvshalt/JvmExitDemoUnitTest.java → core-java-modules/core-java-jvm/src/test/java/com/baeldung/exitvshalt/JvmExitDemoManualTest.java
View File

@@ -2,7 +2,7 @@ package com.baeldung.exitvshalt;
import org.junit.Test;
public class JvmExitDemoUnitTest {
public class JvmExitDemoManualTest {
JvmExitAndHaltDemo jvmExitAndHaltDemo = new JvmExitAndHaltDemo();

2
core-java-modules/core-java-jvm/src/test/java/com/baeldung/exitvshalt/JvmHaltDemoUnitTest.java → core-java-modules/core-java-jvm/src/test/java/com/baeldung/exitvshalt/JvmHaltDemoManualTest.java
View File

@@ -2,7 +2,7 @@ package com.baeldung.exitvshalt;
import org.junit.Test;
public class JvmHaltDemoUnitTest {
public class JvmHaltDemoManualTest {
JvmExitAndHaltDemo jvmExitAndHaltDemo = new JvmExitAndHaltDemo();

3
core-java-modules/core-java-lang-2/README.md
View File

@@ -6,4 +6,7 @@ This module contains articles about core features in the Java language
- [Java Primitives versus Objects](https://www.baeldung.com/java-primitives-vs-objects)
- [Command-Line Arguments in Java](https://www.baeldung.com/java-command-line-arguments)
- [What is a POJO Class?](https://www.baeldung.com/java-pojo-class)
- [Java Default Parameters Using Method Overloading](https://www.baeldung.com/java-default-parameters-method-overloading)
- [How to Return Multiple Values From a Java Method](https://www.baeldung.com/java-method-return-multiple-values)
- [Guide to the Java finally Keyword](https://www.baeldung.com/java-finally-keyword)
- [[<-- Prev]](/core-java-modules/core-java-lang)

8
core-java-modules/core-java-lang-2/pom.xml
View File

@@ -15,10 +15,15 @@
</parent>
<dependencies>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.9</version>
</dependency>
<dependency>
<groupId>commons-beanutils</groupId>
<artifactId>commons-beanutils</artifactId>
<version>1.9.4</version>
<version>${commons.beanutils.version}</version>
</dependency>
<dependency>
<groupId>org.openjdk.jmh</groupId>
@@ -57,6 +62,7 @@
<jmh-core.version>1.19</jmh-core.version>
<jmh-generator.version>1.19</jmh-generator.version>
<assertj.version>3.12.2</assertj.version>
<commons.beanutils.version>1.9.4</commons.beanutils.version>
</properties>
</project>

27
core-java-modules/core-java-lang-2/src/main/java/com/baeldung/headlessmode/FlexibleApp.java Normal file
View File

@@ -0,0 +1,27 @@
package com.baeldung.headlessmode;
import java.awt.GraphicsEnvironment;
import javax.swing.JOptionPane;
public class FlexibleApp {
public static final int HEADLESS = 0;
public static final int HEADED = 1;
public FlexibleApp() {
if (GraphicsEnvironment.isHeadless()) {
System.out.println("Hello World");
} else {
JOptionPane.showMessageDialog(null, "Hello World");
}
}
public static int iAmFlexible() {
if (GraphicsEnvironment.isHeadless()) {
return HEADLESS;
} else {
return HEADED;
}
}
}

20
core-java-modules/core-java-lang-2/src/main/java/com/baeldung/methodmultiplereturnvalues/MultipleReturnValuesUsingApacheCommonsPair.java Normal file
View File

@@ -0,0 +1,20 @@
package com.baeldung.methodmultiplereturnvalues;
import org.apache.commons.lang3.tuple.ImmutablePair;
import org.apache.commons.lang3.tuple.Pair;
import java.util.Comparator;
import java.util.List;
class MultipleReturnValuesUsingApacheCommonsPair {
static ImmutablePair<Coordinates, Double> getMostDistantPoint(
List<Coordinates> coordinatesList,
Coordinates target) {
return coordinatesList.stream()
.map(coordinates -> ImmutablePair.of(coordinates, coordinates.calculateDistance(target)))
.max(Comparator.comparingDouble(Pair::getRight))
.get();
}
}

23
core-java-modules/core-java-lang-2/src/main/java/com/baeldung/methodmultiplereturnvalues/MultipleReturnValuesUsingApacheCommonsTriple.java Normal file
View File

@@ -0,0 +1,23 @@
package com.baeldung.methodmultiplereturnvalues;
import org.apache.commons.lang3.tuple.ImmutableTriple;
import java.util.List;
import java.util.stream.Collectors;
class MultipleReturnValuesUsingApacheCommonsTriple {
static ImmutableTriple<Double, Double, Double> getMinAvgMaxTriple(
List<Coordinates> coordinatesList,
Coordinates target) {
List<Double> distanceList = coordinatesList.stream()
.map(coordinates -> coordinates.calculateDistance(target))
.collect(Collectors.toList());
Double minDistance = distanceList.stream().mapToDouble(Double::doubleValue).min().getAsDouble();
Double avgDistance = distanceList.stream().mapToDouble(Double::doubleValue).average().orElse(0.0D);
Double maxDistance = distanceList.stream().mapToDouble(Double::doubleValue).max().getAsDouble();
return ImmutableTriple.of(minDistance, avgDistance, maxDistance);
}
}

87
core-java-modules/core-java-lang-2/src/test/java/com/baeldung/headlessmode/HeadlessModeUnitTest.java Normal file
View File

@@ -0,0 +1,87 @@
package com.baeldung.headlessmode;
import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
import java.awt.Canvas;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Frame;
import java.awt.GraphicsEnvironment;
import java.awt.HeadlessException;
import java.awt.image.BufferedImage;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import javax.imageio.ImageIO;
import org.junit.Assume;
import org.junit.Before;
import org.junit.Test;
public class HeadlessModeUnitTest {
private static final String IN_FILE = "/product.png";
private static final String OUT_FILE = System.getProperty("java.io.tmpdir") + "/product.jpg";
private static final String FORMAT = "jpg";
@Before
public void setUpHeadlessMode() {
System.setProperty("java.awt.headless", "true");
}
@Test
public void whenJavaAwtHeadlessSetToTrue_thenIsHeadlessReturnsTrue() {
assertThat(GraphicsEnvironment.isHeadless()).isTrue();
}
@Test
public void whenHeadlessMode_thenFontsWork() {
GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
String fonts[] = ge.getAvailableFontFamilyNames();
assertThat(fonts).isNotEmpty();
Font font = new Font(fonts[0], Font.BOLD, 14);
FontMetrics fm = (new Canvas()).getFontMetrics(font);
assertThat(fm.getHeight()).isGreaterThan(0);
assertThat(fm.getAscent()).isGreaterThan(0);
assertThat(fm.getDescent()).isGreaterThan(0);
}
@Test
public void whenHeadlessMode_thenImagesWork() throws IOException {
boolean result = false;
try (InputStream inStream = HeadlessModeUnitTest.class.getResourceAsStream(IN_FILE); FileOutputStream outStream = new FileOutputStream(OUT_FILE)) {
BufferedImage inputImage = ImageIO.read(inStream);
result = ImageIO.write(inputImage, FORMAT, outStream);
}
assertThat(result).isTrue();
}
@Test
public void whenHeadlessmode_thenFrameThrowsHeadlessException() {
assertThatExceptionOfType(HeadlessException.class).isThrownBy(() -> {
Frame frame = new Frame();
frame.setVisible(true);
frame.setSize(120, 120);
});
}
@Test
public void whenHeadless_thenFlexibleAppAdjustsItsBehavior() {
assertThat(FlexibleApp.iAmFlexible()).isEqualTo(FlexibleApp.HEADLESS);
}
@Test
public void whenHeaded_thenFlexibleAppAdjustsItsBehavior() {
Assume.assumeFalse(GraphicsEnvironment.isHeadless());
assertThat(FlexibleApp.iAmFlexible()).isEqualTo(FlexibleApp.HEADED);
}
}

34
core-java-modules/core-java-lang-2/src/test/java/com/baeldung/methodmultiplereturnvalues/MultipleReturnValuesUsingApacheCommonsPairUnitTest.java Normal file
View File

@@ -0,0 +1,34 @@
package com.baeldung.methodmultiplereturnvalues;
import org.apache.commons.lang3.tuple.ImmutablePair;
import org.junit.jupiter.api.Test;
import java.math.BigDecimal;
import java.math.RoundingMode;
import java.util.ArrayList;
import java.util.List;
import static org.junit.jupiter.api.Assertions.assertEquals;
class MultipleReturnValuesUsingApacheCommonsPairUnitTest {
@Test
void whenUsingPair_thenMultipleFieldsAreReturned() {
List<Coordinates> coordinatesList = new ArrayList<>();
coordinatesList.add(new Coordinates(1, 1, "home"));
coordinatesList.add(new Coordinates(2, 2, "school"));
coordinatesList.add(new Coordinates(3, 3, "hotel"));
Coordinates target = new Coordinates(5, 5, "gym");
ImmutablePair<Coordinates, Double> mostDistantPoint = MultipleReturnValuesUsingApacheCommonsPair.getMostDistantPoint(coordinatesList, target);
assertEquals(1, mostDistantPoint.getLeft().getLongitude());
assertEquals(1, mostDistantPoint.getLeft().getLatitude());
assertEquals("home", mostDistantPoint.getLeft().getPlaceName());
assertEquals(5.66, BigDecimal.valueOf(mostDistantPoint.getRight()).setScale(2, RoundingMode.HALF_UP).doubleValue());
}
}

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