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Merge branch 'readme-30' of https://github.com/sjmillington/tutorials into readme-30

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Sjmillington
2019-10-05 16:58:38 +01:00
parent 931e71095c 746f62cc5f
commit af5759705c
498 changed files with 2613 additions and 2610 deletions
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37
core-java-modules/core-java-lang/README.md
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@@ -4,30 +4,22 @@ This module contains articles about core features in the Java language
### Relevant Articles:
- [Generate equals() and hashCode() with Eclipse](http://www.baeldung.com/java-eclipse-equals-and-hashcode)
- [Chained Exceptions in Java](http://www.baeldung.com/java-chained-exceptions)
- [Iterating Over Enum Values in Java](http://www.baeldung.com/java-enum-iteration)
- [Java Double Brace Initialization](http://www.baeldung.com/java-double-brace-initialization)
- [Guide to the Diamond Operator in Java](http://www.baeldung.com/java-diamond-operator)
- [Comparator and Comparable in Java](http://www.baeldung.com/java-comparator-comparable)
- [The Java continue and break Keywords](http://www.baeldung.com/java-continue-and-break)
- [Nested Classes in Java](http://www.baeldung.com/java-nested-classes)
- [A Guide to Inner Interfaces in Java](http://www.baeldung.com/java-inner-interfaces)
- [Recursion In Java](http://www.baeldung.com/java-recursion)
- [A Guide to the finalize Method in Java](http://www.baeldung.com/java-finalize)
- [Infinite Loops in Java](http://www.baeldung.com/infinite-loops-java)
- [Quick Guide to java.lang.System](http://www.baeldung.com/java-lang-system)
- [Using Java Assertions](http://www.baeldung.com/java-assert)
- [ClassNotFoundException vs NoClassDefFoundError](http://www.baeldung.com/java-classnotfoundexception-and-noclassdeffounderror)
- [The StackOverflowError in Java](http://www.baeldung.com/java-stack-overflow-error)
- [Create a Custom Exception in Java](http://www.baeldung.com/java-new-custom-exception)
- [Exception Handling in Java](http://www.baeldung.com/java-exceptions)
- [Differences Between Final, Finally and Finalize in Java](https://www.baeldung.com/java-final-finally-finalize)
- [Generate equals() and hashCode() with Eclipse](https://www.baeldung.com/java-eclipse-equals-and-hashcode)
- [Iterating Over Enum Values in Java](https://www.baeldung.com/java-enum-iteration)
- [Java Double Brace Initialization](https://www.baeldung.com/java-double-brace-initialization)
- [Guide to the Diamond Operator in Java](https://www.baeldung.com/java-diamond-operator)
- [Comparator and Comparable in Java](https://www.baeldung.com/java-comparator-comparable)
- [The Java continue and break Keywords](https://www.baeldung.com/java-continue-and-break)
- [Nested Classes in Java](https://www.baeldung.com/java-nested-classes)
- [A Guide to Inner Interfaces in Java](https://www.baeldung.com/java-inner-interfaces)
- [Recursion In Java](https://www.baeldung.com/java-recursion)
- [A Guide to the finalize Method in Java](https://www.baeldung.com/java-finalize)
- [Infinite Loops in Java](https://www.baeldung.com/infinite-loops-java)
- [Quick Guide to java.lang.System](https://www.baeldung.com/java-lang-system)
- [Using Java Assertions](https://www.baeldung.com/java-assert)
- [Static and Dynamic Binding in Java](https://www.baeldung.com/java-static-dynamic-binding)
- [Difference Between Throw and Throws in Java](https://www.baeldung.com/java-throw-throws)
- [Synthetic Constructs in Java](https://www.baeldung.com/java-synthetic)
- [How to Separate Double into Integer and Decimal Parts](https://www.baeldung.com/java-separate-double-into-integer-decimal-parts)
- [“Sneaky Throws” in Java](http://www.baeldung.com/java-sneaky-throws)
- [Retrieving a Class Name in Java](https://www.baeldung.com/java-class-name)
- [Java Compound Operators](https://www.baeldung.com/java-compound-operators)
- [Guide to Java Packages](https://www.baeldung.com/java-packages)
@@ -38,4 +30,5 @@ This module contains articles about core features in the Java language
- [Attaching Values to Java Enum](https://www.baeldung.com/java-enum-values)
- [Variable Scope in Java](https://www.baeldung.com/java-variable-scope)
- [Java Classes and Objects](https://www.baeldung.com/java-classes-objects)
- [[More --> ]](/core-java-modules/core-java-lang-2)
- [A Guide to Java Enums](https://www.baeldung.com/a-guide-to-java-enums)
- [[More --> ]](/core-java-modules/core-java-lang-2)

14
core-java-modules/core-java-lang/pom.xml
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@@ -43,12 +43,6 @@
<artifactId>log4j-over-slf4j</artifactId>
<version>${org.slf4j.version}</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>${lombok.version}</version>
<scope>provided</scope>
</dependency>
<!-- test scoped -->
<dependency>
<groupId>org.assertj</groupId>
@@ -56,11 +50,6 @@
<version>${assertj-core.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>javax.mail</groupId>
<artifactId>mail</artifactId>
<version>${javax.mail.version}</version>
</dependency>
</dependencies>
<build>
@@ -75,9 +64,6 @@
<properties>
<gson.version>2.8.2</gson.version>
<javax.mail.version>1.5.0-b01</javax.mail.version>
<!-- testing -->
<assertj-core.version>3.10.0</assertj-core.version>
</properties>

41
core-java-modules/core-java-lang/src/main/java/com/baeldung/chainedexception/LogWithChain.java
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@@ -1,41 +0,0 @@
package com.baeldung.chainedexception;
import com.baeldung.chainedexception.exceptions.GirlFriendOfManagerUpsetException;
import com.baeldung.chainedexception.exceptions.ManagerUpsetException;
import com.baeldung.chainedexception.exceptions.NoLeaveGrantedException;
import com.baeldung.chainedexception.exceptions.TeamLeadUpsetException;
public class LogWithChain {
public static void main(String[] args) throws Exception {
getLeave();
}
private static void getLeave() throws NoLeaveGrantedException {
try {
howIsTeamLead();
} catch (TeamLeadUpsetException e) {
throw new NoLeaveGrantedException("Leave not sanctioned.", e);
}
}
private static void howIsTeamLead() throws TeamLeadUpsetException {
try {
howIsManager();
} catch (ManagerUpsetException e) {
throw new TeamLeadUpsetException("Team lead is not in good mood", e);
}
}
private static void howIsManager() throws ManagerUpsetException {
try {
howIsGirlFriendOfManager();
} catch (GirlFriendOfManagerUpsetException e) {
throw new ManagerUpsetException("Manager is in bad mood", e);
}
}
private static void howIsGirlFriendOfManager() throws GirlFriendOfManagerUpsetException {
throw new GirlFriendOfManagerUpsetException("Girl friend of manager is in bad mood");
}
}

44
core-java-modules/core-java-lang/src/main/java/com/baeldung/chainedexception/LogWithoutChain.java
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@@ -1,44 +0,0 @@
package com.baeldung.chainedexception;
import com.baeldung.chainedexception.exceptions.GirlFriendOfManagerUpsetException;
import com.baeldung.chainedexception.exceptions.ManagerUpsetException;
import com.baeldung.chainedexception.exceptions.NoLeaveGrantedException;
import com.baeldung.chainedexception.exceptions.TeamLeadUpsetException;
public class LogWithoutChain {
public static void main(String[] args) throws Exception {
getLeave();
}
private static void getLeave() throws NoLeaveGrantedException {
try {
howIsTeamLead();
} catch (TeamLeadUpsetException e) {
e.printStackTrace();
throw new NoLeaveGrantedException("Leave not sanctioned.");
}
}
private static void howIsTeamLead() throws TeamLeadUpsetException {
try {
howIsManager();
} catch (ManagerUpsetException e) {
e.printStackTrace();
throw new TeamLeadUpsetException("Team lead is not in good mood");
}
}
private static void howIsManager() throws ManagerUpsetException {
try {
howIsGirlFriendOfManager();
} catch (GirlFriendOfManagerUpsetException e) {
e.printStackTrace();
throw new ManagerUpsetException("Manager is in bad mood");
}
}
private static void howIsGirlFriendOfManager() throws GirlFriendOfManagerUpsetException {
throw new GirlFriendOfManagerUpsetException("Girl friend of manager is in bad mood");
}
}

12
core-java-modules/core-java-lang/src/main/java/com/baeldung/chainedexception/exceptions/GirlFriendOfManagerUpsetException.java
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@@ -1,12 +0,0 @@
package com.baeldung.chainedexception.exceptions;
public class GirlFriendOfManagerUpsetException extends Exception {
public GirlFriendOfManagerUpsetException(String message, Throwable cause) {
super(message, cause);
}
public GirlFriendOfManagerUpsetException(String message) {
super(message);
}
}

12
core-java-modules/core-java-lang/src/main/java/com/baeldung/chainedexception/exceptions/ManagerUpsetException.java
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@@ -1,12 +0,0 @@
package com.baeldung.chainedexception.exceptions;
public class ManagerUpsetException extends Exception {
public ManagerUpsetException(String message, Throwable cause) {
super(message, cause);
}
public ManagerUpsetException(String message) {
super(message);
}
}

12
core-java-modules/core-java-lang/src/main/java/com/baeldung/chainedexception/exceptions/NoLeaveGrantedException.java
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@@ -1,12 +0,0 @@
package com.baeldung.chainedexception.exceptions;
public class NoLeaveGrantedException extends Exception {
public NoLeaveGrantedException(String message, Throwable cause) {
super(message, cause);
}
public NoLeaveGrantedException(String message) {
super(message);
}
}

12
core-java-modules/core-java-lang/src/main/java/com/baeldung/chainedexception/exceptions/TeamLeadUpsetException.java
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@@ -1,12 +0,0 @@
package com.baeldung.chainedexception.exceptions;
public class TeamLeadUpsetException extends Exception {
public TeamLeadUpsetException(String message, Throwable cause) {
super(message, cause);
}
public TeamLeadUpsetException(String message) {
super(message);
}
}

43
core-java-modules/core-java-lang/src/main/java/com/baeldung/customexception/FileManager.java
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@@ -1,43 +0,0 @@
package com.baeldung.customexception;
import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
public class FileManager {
public static String getFirstLine(String fileName) throws IncorrectFileNameException {
try (Scanner file = new Scanner(new File(fileName))) {
if (file.hasNextLine()) {
return file.nextLine();
} else {
throw new IllegalArgumentException("Non readable file");
}
} catch (FileNotFoundException err) {
if (!isCorrectFileName(fileName)) {
throw new IncorrectFileNameException("Incorrect filename : " + fileName, err);
}
// Logging etc
} catch (IllegalArgumentException err) {
if (!containsExtension(fileName)) {
throw new IncorrectFileExtensionException("Filename does not contain extension : " + fileName, err);
}
// Other error cases and logging
}
return "Default First Line";
}
private static boolean containsExtension(String fileName) {
if (fileName.contains(".txt") || fileName.contains(".doc"))
return true;
return false;
}
private static boolean isCorrectFileName(String fileName) {
if (fileName.equals("wrongFileName.txt"))
return false;
else
return true;
}
}

9
core-java-modules/core-java-lang/src/main/java/com/baeldung/customexception/IncorrectFileExtensionException.java
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@@ -1,9 +0,0 @@
package com.baeldung.customexception;
public class IncorrectFileExtensionException extends RuntimeException{
private static final long serialVersionUID = 1L;
public IncorrectFileExtensionException(String errorMessage, Throwable err) {
super(errorMessage, err);
}
}

9
core-java-modules/core-java-lang/src/main/java/com/baeldung/customexception/IncorrectFileNameException.java
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@@ -1,9 +0,0 @@
package com.baeldung.customexception;
public class IncorrectFileNameException extends Exception {
private static final long serialVersionUID = 1L;
public IncorrectFileNameException(String errorMessage, Throwable err) {
super(errorMessage, err);
}
}

212
core-java-modules/core-java-lang/src/main/java/com/baeldung/exceptionhandling/Exceptions.java
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@@ -1,212 +0,0 @@
package com.baeldung.exceptionhandling;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.List;
import java.util.Scanner;
import java.util.logging.Logger;
import java.util.stream.Collectors;
public class Exceptions {
private final static Logger logger = Logger.getLogger("ExceptionLogging");
public static List<Player> getPlayers() throws IOException {
Path path = Paths.get("players.dat");
List<String> players = Files.readAllLines(path);
return players.stream()
.map(Player::new)
.collect(Collectors.toList());
}
public List<Player> loadAllPlayers(String playersFile) throws IOException{
try {
throw new IOException();
} catch(IOException ex) {
throw new IllegalStateException();
}
}
public int getPlayerScoreThrows(String playerFile) throws FileNotFoundException {
Scanner contents = new Scanner(new File(playerFile));
return Integer.parseInt(contents.nextLine());
}
public int getPlayerScoreTryCatch(String playerFile) {
try {
Scanner contents = new Scanner(new File(playerFile));
return Integer.parseInt(contents.nextLine());
} catch (FileNotFoundException noFile) {
throw new IllegalArgumentException("File not found");
}
}
public int getPlayerScoreTryCatchRecovery(String playerFile) {
try {
Scanner contents = new Scanner(new File(playerFile));
return Integer.parseInt(contents.nextLine());
} catch ( FileNotFoundException noFile ) {
logger.warning("File not found, resetting score.");
return 0;
}
}
public int getPlayerScoreFinally(String playerFile) throws FileNotFoundException {
Scanner contents = null;
try {
contents = new Scanner(new File(playerFile));
return Integer.parseInt(contents.nextLine());
} finally {
if (contents != null) {
contents.close();
}
}
}
public int getPlayerScoreTryWithResources(String playerFile) {
try (Scanner contents = new Scanner(new File(playerFile))) {
return Integer.parseInt(contents.nextLine());
} catch (FileNotFoundException e ) {
logger.warning("File not found, resetting score.");
return 0;
}
}
public int getPlayerScoreMultipleCatchBlocks(String playerFile) {
try (Scanner contents = new Scanner(new File(playerFile))) {
return Integer.parseInt(contents.nextLine());
} catch (IOException e) {
logger.warning("Player file wouldn't load!");
return 0;
} catch (NumberFormatException e) {
logger.warning("Player file was corrupted!");
return 0;
}
}
public int getPlayerScoreMultipleCatchBlocksAlternative(String playerFile) {
try (Scanner contents = new Scanner(new File(playerFile)) ) {
return Integer.parseInt(contents.nextLine());
} catch (FileNotFoundException e) {
logger.warning("Player file not found!");
return 0;
} catch (IOException e) {
logger.warning("Player file wouldn't load!");
return 0;
} catch (NumberFormatException e) {
logger.warning("Player file was corrupted!");
return 0;
}
}
public int getPlayerScoreUnionCatchBlocks(String playerFile) {
try (Scanner contents = new Scanner(new File(playerFile))) {
return Integer.parseInt(contents.nextLine());
} catch (IOException | NumberFormatException e) {
logger.warning("Failed to load score!");
return 0;
}
}
public List<Player> loadAllPlayersThrowingChecked(String playersFile) throws TimeoutException {
boolean tooLong = true;
while (!tooLong) {
// ... potentially long operation
}
throw new TimeoutException("This operation took too long");
}
public List<Player> loadAllPlayersThrowingUnchecked(String playersFile) throws TimeoutException {
if(!isFilenameValid(playersFile)) {
throw new IllegalArgumentException("Filename isn't valid!");
}
return null;
// ...
}
public List<Player> loadAllPlayersWrapping(String playersFile) throws IOException {
try {
throw new IOException();
} catch (IOException io) {
throw io;
}
}
public List<Player> loadAllPlayersRethrowing(String playersFile) throws PlayerLoadException {
try {
throw new IOException();
} catch (IOException io) {
throw new PlayerLoadException(io);
}
}
public List<Player> loadAllPlayersThrowable(String playersFile) {
try {
throw new NullPointerException();
} catch ( Throwable t ) {
throw t;
}
}
class FewerExceptions extends Exceptions {
@Override
public List<Player> loadAllPlayers(String playersFile) { //can't add "throws MyCheckedException
return null;
// overridden
}
}
public void throwAsGotoAntiPattern() throws MyException {
try {
// bunch of code
throw new MyException();
// second bunch of code
} catch ( MyException e ) {
// third bunch of code
}
}
public int getPlayerScoreSwallowingExceptionAntiPattern(String playerFile) {
try {
// ...
} catch (Exception e) {} // <== catch and swallow
return 0;
}
public int getPlayerScoreSwallowingExceptionAntiPatternAlternative(String playerFile) {
try {
// ...
} catch (Exception e) {
e.printStackTrace();
}
return 0;
}
public int getPlayerScoreSwallowingExceptionAntiPatternAlternative2(String playerFile) throws PlayerScoreException {
try {
throw new IOException();
} catch (IOException e) {
throw new PlayerScoreException(e);
}
}
public int getPlayerScoreReturnInFinallyAntiPattern(String playerFile) {
int score = 0;
try {
throw new IOException();
} finally {
return score; // <== the IOException is dropped
}
}
private boolean isFilenameValid(String name) {
return false;
}
}

5
core-java-modules/core-java-lang/src/main/java/com/baeldung/exceptionhandling/MyException.java
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@@ -1,5 +0,0 @@
package com.baeldung.exceptionhandling;
public class MyException extends Throwable {
}

12
core-java-modules/core-java-lang/src/main/java/com/baeldung/exceptionhandling/Player.java
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@@ -1,12 +0,0 @@
package com.baeldung.exceptionhandling;
public class Player {
public int id;
public String name;
public Player(String name) {
this.name = name;
}
}

11
core-java-modules/core-java-lang/src/main/java/com/baeldung/exceptionhandling/PlayerLoadException.java
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@@ -1,11 +0,0 @@
package com.baeldung.exceptionhandling;
import java.io.IOException;
public class PlayerLoadException extends Exception {
public PlayerLoadException(IOException io) {
super(io);
}
}

8
core-java-modules/core-java-lang/src/main/java/com/baeldung/exceptionhandling/PlayerScoreException.java
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@@ -1,8 +0,0 @@
package com.baeldung.exceptionhandling;
public class PlayerScoreException extends Exception {
public PlayerScoreException(Exception e) {
super(e);
}
}

8
core-java-modules/core-java-lang/src/main/java/com/baeldung/exceptionhandling/TimeoutException.java
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@@ -1,8 +0,0 @@
package com.baeldung.exceptionhandling;
public class TimeoutException extends Exception {
public TimeoutException(String message) {
super(message);
}
}

18
core-java-modules/core-java-lang/src/main/java/com/baeldung/keywords/finalize/FinalizeObject.java
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@@ -1,18 +0,0 @@
package com.baeldung.keywords.finalize;
public class FinalizeObject {
@Override
protected void finalize() throws Throwable {
System.out.println("Execute finalize method");
super.finalize();
}
public static void main(String[] args) throws Exception {
FinalizeObject object = new FinalizeObject();
object = null;
System.gc();
Thread.sleep(1000);
}
}

15
core-java-modules/core-java-lang/src/main/java/com/baeldung/keywords/finalkeyword/Child.java
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@@ -1,15 +0,0 @@
package com.baeldung.keywords.finalkeyword;
public final class Child extends Parent {
@Override
void method1(int arg1, final int arg2) {
// OK
}
/* @Override
void method2() {
// Compilation error
}*/
}

5
core-java-modules/core-java-lang/src/main/java/com/baeldung/keywords/finalkeyword/GrandChild.java
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@@ -1,5 +0,0 @@
package com.baeldung.keywords.finalkeyword;
/*public class GrandChild extends Child {
// Compilation error
}*/

23
core-java-modules/core-java-lang/src/main/java/com/baeldung/keywords/finalkeyword/Parent.java
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@@ -1,23 +0,0 @@
package com.baeldung.keywords.finalkeyword;
public class Parent {
int field1 = 1;
final int field2 = 2;
Parent() {
field1 = 2; // OK
// field2 = 3; // Compilation error
}
void method1(int arg1, final int arg2) {
arg1 = 2; // OK
// arg2 = 3; // Compilation error
}
final void method2() {
final int localVar = 2; // OK
// localVar = 3; // Compilation error
}
}

29
core-java-modules/core-java-lang/src/main/java/com/baeldung/keywords/finallykeyword/FinallyExample.java
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@@ -1,29 +0,0 @@
package com.baeldung.keywords.finallykeyword;
public class FinallyExample {
public static void main(String args[]) throws Exception {
try {
System.out.println("Execute try block");
throw new Exception();
} catch (Exception e) {
System.out.println("Execute catch block");
} finally {
System.out.println("Execute finally block");
}
try {
System.out.println("Execute try block");
} finally {
System.out.println("Execute finally block");
}
try {
System.out.println("Execute try block");
throw new Exception();
} finally {
System.out.println("Execute finally block");
}
}
}

5
core-java-modules/core-java-lang/src/main/java/com/baeldung/noclassdeffounderror/ClassWithInitErrors.java
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@@ -1,5 +0,0 @@
package com.baeldung.noclassdeffounderror;
public class ClassWithInitErrors {
static int data = 1 / 0;
}

14
core-java-modules/core-java-lang/src/main/java/com/baeldung/noclassdeffounderror/NoClassDefFoundErrorExample.java
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@@ -1,14 +0,0 @@
package com.baeldung.noclassdeffounderror;
public class NoClassDefFoundErrorExample {
public ClassWithInitErrors getClassWithInitErrors() {
ClassWithInitErrors test;
try {
test = new ClassWithInitErrors();
} catch (Throwable t) {
System.out.println(t);
}
test = new ClassWithInitErrors();
return test;
}
}

23
core-java-modules/core-java-lang/src/main/java/com/baeldung/sneakythrows/SneakyRunnable.java
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@@ -1,23 +0,0 @@
package com.baeldung.sneakythrows;
import lombok.SneakyThrows;
public class SneakyRunnable implements Runnable {
@SneakyThrows
public void run() {
try {
throw new InterruptedException();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
try {
new SneakyRunnable().run();
} catch (Exception e) {
e.printStackTrace();
}
}
}

25
core-java-modules/core-java-lang/src/main/java/com/baeldung/sneakythrows/SneakyThrows.java
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@@ -1,25 +0,0 @@
package com.baeldung.sneakythrows;
import java.io.IOException;
public class SneakyThrows {
public static <E extends Throwable> void sneakyThrow(Throwable e) throws E {
throw (E) e;
}
public static void throwsSneakyIOException() {
sneakyThrow(new IOException("sneaky"));
}
public static void main(String[] args) {
try {
throwsSneakyIOException();
} catch (Exception ex) {
ex.printStackTrace();
}
}
}

8
core-java-modules/core-java-lang/src/main/java/com/baeldung/stackoverflowerror/AccountHolder.java
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@@ -1,8 +0,0 @@
package com.baeldung.stackoverflowerror;
public class AccountHolder {
private String firstName;
private String lastName;
AccountHolder jointAccountHolder = new AccountHolder();
}

16
core-java-modules/core-java-lang/src/main/java/com/baeldung/stackoverflowerror/ClassOne.java
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@@ -1,16 +0,0 @@
package com.baeldung.stackoverflowerror;
public class ClassOne {
private int oneValue;
private ClassTwo clsTwoInstance = null;
public ClassOne() {
oneValue = 0;
clsTwoInstance = new ClassTwo();
}
public ClassOne(int oneValue, ClassTwo clsTwoInstance) {
this.oneValue = oneValue;
this.clsTwoInstance = clsTwoInstance;
}
}

16
core-java-modules/core-java-lang/src/main/java/com/baeldung/stackoverflowerror/ClassTwo.java
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@@ -1,16 +0,0 @@
package com.baeldung.stackoverflowerror;
public class ClassTwo {
private int twoValue;
private ClassOne clsOneInstance = null;
public ClassTwo() {
twoValue = 10;
clsOneInstance = new ClassOne();
}
public ClassTwo(int twoValue, ClassOne clsOneInstance) {
this.twoValue = twoValue;
this.clsOneInstance = clsOneInstance;
}
}

7
core-java-modules/core-java-lang/src/main/java/com/baeldung/stackoverflowerror/InfiniteRecursionWithTerminationCondition.java
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@@ -1,7 +0,0 @@
package com.baeldung.stackoverflowerror;
public class InfiniteRecursionWithTerminationCondition {
public int calculateFactorial(final int number) {
return number == 1 ? 1 : number * calculateFactorial(number - 1);
}
}

7
core-java-modules/core-java-lang/src/main/java/com/baeldung/stackoverflowerror/RecursionWithCorrectTerminationCondition.java
View File

@@ -1,7 +0,0 @@
package com.baeldung.stackoverflowerror;
public class RecursionWithCorrectTerminationCondition {
public int calculateFactorial(final int number) {
return number <= 1 ? 1 : number * calculateFactorial(number - 1);
}
}

7
core-java-modules/core-java-lang/src/main/java/com/baeldung/stackoverflowerror/UnintendedInfiniteRecursion.java
View File

@@ -1,7 +0,0 @@
package com.baeldung.stackoverflowerror;
public class UnintendedInfiniteRecursion {
public int calculateFactorial(int number) {
return number * calculateFactorial(number - 1);
}
}

9
core-java-modules/core-java-lang/src/main/java/com/baeldung/throwsexception/DataAccessException.java
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@@ -1,9 +0,0 @@
package com.baeldung.throwsexception;
public class DataAccessException extends RuntimeException {
public DataAccessException(String message, Throwable cause) {
super(message, cause);
}
}

41
core-java-modules/core-java-lang/src/main/java/com/baeldung/throwsexception/Main.java
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@@ -1,41 +0,0 @@
package com.baeldung.throwsexception;
import com.sun.mail.iap.ConnectionException;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.net.SocketException;
public class Main {
public static void main(String[] args) throws FileNotFoundException {
TryCatch tryCatch = new TryCatch();
try {
tryCatch.execute();
} catch (ConnectionException | SocketException ex) {
System.out.println("IOException");
} catch (Exception ex) {
System.out.println("General exception");
}
checkedException();
checkedExceptionWithThrows();
}
private static void checkedExceptionWithThrows() throws FileNotFoundException {
File file = new File("not_existing_file.txt");
FileInputStream stream = new FileInputStream(file);
}
private static void checkedException() {
File file = new File("not_existing_file.txt");
try {
FileInputStream stream = new FileInputStream(file);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
}

12
core-java-modules/core-java-lang/src/main/java/com/baeldung/throwsexception/PersonRepository.java
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@@ -1,12 +0,0 @@
package com.baeldung.throwsexception;
import java.sql.SQLException;
import java.util.List;
public class PersonRepository {
public List<String> findAll() throws SQLException {
throw new SQLException();
}
}

22
core-java-modules/core-java-lang/src/main/java/com/baeldung/throwsexception/SimpleService.java
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@@ -1,22 +0,0 @@
package com.baeldung.throwsexception;
import java.sql.SQLException;
public class SimpleService {
private PersonRepository personRepository = new PersonRepository();
public void wrappingException() {
try {
personRepository.findAll();
} catch (SQLException e) {
throw new DataAccessException("SQL Exception", e);
}
}
public void runtimeNullPointerException() {
String a = null;
a.length();
}
}

13
core-java-modules/core-java-lang/src/main/java/com/baeldung/throwsexception/TryCatch.java
View File

@@ -1,13 +0,0 @@
package com.baeldung.throwsexception;
import com.sun.mail.iap.ConnectionException;
import java.net.SocketException;
public class TryCatch {
public void execute() throws SocketException, ConnectionException, Exception {
//code that would throw any of: SocketException, ConnectionException, Exception
}
}

11
core-java-modules/core-java-lang/src/test/java/com/baeldung/classnotfoundexception/ClassNotFoundExceptionUnitTest.java
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@@ -1,11 +0,0 @@
package com.baeldung.classnotfoundexception;
import org.junit.Test;
public class ClassNotFoundExceptionUnitTest {
@Test(expected = ClassNotFoundException.class)
public void givenNoDriversInClassPath_whenLoadDrivers_thenClassNotFoundException() throws ClassNotFoundException {
Class.forName("oracle.jdbc.driver.OracleDriver");
}
}

29
core-java-modules/core-java-lang/src/test/java/com/baeldung/customexception/IncorrectFileExtensionExceptionUnitTest.java
View File

@@ -1,29 +0,0 @@
package com.baeldung.customexception;
import static org.assertj.core.api.Assertions.assertThat;
import java.io.File;
import org.junit.Test;
public class IncorrectFileExtensionExceptionUnitTest {
@Test
public void testWhenCorrectFileExtensionGiven_ReceivesNoException() throws IncorrectFileNameException {
assertThat(FileManager.getFirstLine("correctFileNameWithProperExtension.txt")).isEqualTo("Default First Line");
}
@Test(expected = IncorrectFileExtensionException.class)
public void testWhenCorrectFileNameExceptionThrown_ReceivesNoException() throws IncorrectFileNameException {
StringBuffer sBuffer = new StringBuffer();
sBuffer.append("src");
sBuffer.append(File.separator);
sBuffer.append("test");
sBuffer.append(File.separator);
sBuffer.append("resources");
sBuffer.append(File.separator);
sBuffer.append("correctFileNameWithoutProperExtension");
FileManager.getFirstLine(sBuffer.toString());
}
}

19
core-java-modules/core-java-lang/src/test/java/com/baeldung/customexception/IncorrectFileNameExceptionUnitTest.java
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@@ -1,19 +0,0 @@
package com.baeldung.customexception;
import static org.assertj.core.api.Assertions.assertThat;
import org.junit.Test;
public class IncorrectFileNameExceptionUnitTest {
@Test(expected = IncorrectFileNameException.class)
public void testWhenIncorrectFileNameExceptionThrown_ReceivesIncorrectFileNameException() throws IncorrectFileNameException {
FileManager.getFirstLine("wrongFileName.txt");
}
@Test
public void testWhenCorrectFileNameExceptionThrown_ReceivesNoException() throws IncorrectFileNameException {
assertThat(FileManager.getFirstLine("correctFileName.txt")).isEqualTo("Default First Line");
}
}

80
core-java-modules/core-java-lang/src/test/java/com/baeldung/exceptionhandling/ExceptionsUnitTest.java
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@@ -1,80 +0,0 @@
package com.baeldung.exceptionhandling;
import org.junit.Test;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.nio.file.NoSuchFileException;
import static org.assertj.core.api.Assertions.assertThatThrownBy;
public class ExceptionsUnitTest {
Exceptions exceptions = new Exceptions();
@Test
public void getPlayers() {
assertThatThrownBy(() -> exceptions.getPlayers())
.isInstanceOf(NoSuchFileException.class);
}
@Test
public void loadAllPlayers() {
assertThatThrownBy(() -> exceptions.loadAllPlayers(""))
.isInstanceOf(IllegalStateException.class);
}
@Test
public void getPlayerScoreThrows() {
assertThatThrownBy(() -> exceptions.getPlayerScoreThrows(""))
.isInstanceOf(FileNotFoundException.class);
}
@Test
public void getPlayerScoreTryCatch() {
assertThatThrownBy(() -> exceptions.getPlayerScoreTryCatch(""))
.isInstanceOf(IllegalArgumentException.class);
}
@Test
public void getPlayerScoreFinally() {
assertThatThrownBy(() -> exceptions.getPlayerScoreFinally(""))
.isInstanceOf(FileNotFoundException.class);
}
@Test
public void loadAllPlayersThrowingChecked() {
assertThatThrownBy(() -> exceptions.loadAllPlayersThrowingChecked(""))
.isInstanceOf(TimeoutException.class);
}
@Test
public void loadAllPlayersThrowingUnchecked() {
assertThatThrownBy(() -> exceptions.loadAllPlayersThrowingUnchecked(""))
.isInstanceOf(IllegalArgumentException.class);
}
@Test
public void loadAllPlayersWrapping() {
assertThatThrownBy(() -> exceptions.loadAllPlayersWrapping(""))
.isInstanceOf(IOException.class);
}
@Test
public void loadAllPlayersRethrowing() {
assertThatThrownBy(() -> exceptions.loadAllPlayersRethrowing(""))
.isInstanceOf(PlayerLoadException.class);
}
@Test
public void loadAllPlayersThrowable() {
assertThatThrownBy(() -> exceptions.loadAllPlayersThrowable(""))
.isInstanceOf(NullPointerException.class);
}
@Test
public void getPlayerScoreSwallowingExceptionAntiPatternAlternative2() {
assertThatThrownBy(() -> exceptions.getPlayerScoreSwallowingExceptionAntiPatternAlternative2(""))
.isInstanceOf(PlayerScoreException.class);
}
}

12
core-java-modules/core-java-lang/src/test/java/com/baeldung/noclassdeffounderror/NoClassDefFoundErrorUnitTest.java
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@@ -1,12 +0,0 @@
package com.baeldung.noclassdeffounderror;
import org.junit.Test;
public class NoClassDefFoundErrorUnitTest {
@Test(expected = NoClassDefFoundError.class)
public void givenInitErrorInClass_whenloadClass_thenNoClassDefFoundError() {
NoClassDefFoundErrorExample sample = new NoClassDefFoundErrorExample();
sample.getClassWithInitErrors();
}
}

17
core-java-modules/core-java-lang/src/test/java/com/baeldung/sneakythrows/SneakyRunnableUnitTest.java
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@@ -1,17 +0,0 @@
package com.baeldung.sneakythrows;
import org.junit.Test;
import static junit.framework.TestCase.assertEquals;
public class SneakyRunnableUnitTest {
@Test
public void whenCallSneakyRunnableMethod_thenThrowException() {
try {
new SneakyRunnable().run();
} catch (Exception e) {
assertEquals(InterruptedException.class, e.getStackTrace());
}
}
}

18
core-java-modules/core-java-lang/src/test/java/com/baeldung/sneakythrows/SneakyThrowsUnitTest.java
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@@ -1,18 +0,0 @@
package com.baeldung.sneakythrows;
import org.junit.Test;
import static junit.framework.TestCase.assertEquals;
public class SneakyThrowsUnitTest {
@Test
public void whenCallSneakyMethod_thenThrowSneakyException() {
try {
SneakyThrows.throwsSneakyIOException();
} catch (Exception ex) {
assertEquals("sneaky", ex.getMessage().toString());
}
}
}

10
core-java-modules/core-java-lang/src/test/java/com/baeldung/stackoverflowerror/AccountHolderManualTest.java
View File

@@ -1,10 +0,0 @@
package com.baeldung.stackoverflowerror;
import org.junit.Test;
public class AccountHolderManualTest {
@Test(expected = StackOverflowError.class)
public void whenInstanciatingAccountHolder_thenThrowsException() {
AccountHolder holder = new AccountHolder();
}
}

10
core-java-modules/core-java-lang/src/test/java/com/baeldung/stackoverflowerror/CyclicDependancyManualTest.java
View File

@@ -1,10 +0,0 @@
package com.baeldung.stackoverflowerror;
import org.junit.Test;
public class CyclicDependancyManualTest {
@Test(expected = StackOverflowError.class)
public void whenInstanciatingClassOne_thenThrowsException() {
ClassOne obj = new ClassOne();
}
}

31
core-java-modules/core-java-lang/src/test/java/com/baeldung/stackoverflowerror/InfiniteRecursionWithTerminationConditionManualTest.java
View File

@@ -1,31 +0,0 @@
package com.baeldung.stackoverflowerror;
import org.junit.Test;
import static junit.framework.TestCase.assertEquals;
public class InfiniteRecursionWithTerminationConditionManualTest {
@Test
public void givenPositiveIntNoOne_whenCalcFact_thenCorrectlyCalc() {
int numToCalcFactorial = 1;
InfiniteRecursionWithTerminationCondition irtc = new InfiniteRecursionWithTerminationCondition();
assertEquals(1, irtc.calculateFactorial(numToCalcFactorial));
}
@Test
public void givenPositiveIntGtOne_whenCalcFact_thenCorrectlyCalc() {
int numToCalcFactorial = 5;
InfiniteRecursionWithTerminationCondition irtc = new InfiniteRecursionWithTerminationCondition();
assertEquals(120, irtc.calculateFactorial(numToCalcFactorial));
}
@Test(expected = StackOverflowError.class)
public void givenNegativeInt_whenCalcFact_thenThrowsException() {
int numToCalcFactorial = -1;
InfiniteRecursionWithTerminationCondition irtc = new InfiniteRecursionWithTerminationCondition();
irtc.calculateFactorial(numToCalcFactorial);
}
}

15
core-java-modules/core-java-lang/src/test/java/com/baeldung/stackoverflowerror/RecursionWithCorrectTerminationConditionManualTest.java
View File

@@ -1,15 +0,0 @@
package com.baeldung.stackoverflowerror;
import org.junit.Test;
import static junit.framework.TestCase.assertEquals;
public class RecursionWithCorrectTerminationConditionManualTest {
@Test
public void givenNegativeInt_whenCalcFact_thenCorrectlyCalc() {
int numToCalcFactorial = -1;
RecursionWithCorrectTerminationCondition rctc = new RecursionWithCorrectTerminationCondition();
assertEquals(1, rctc.calculateFactorial(numToCalcFactorial));
}
}

30
core-java-modules/core-java-lang/src/test/java/com/baeldung/stackoverflowerror/UnintendedInfiniteRecursionManualTest.java
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@@ -1,30 +0,0 @@
package com.baeldung.stackoverflowerror;
import org.junit.Test;
public class UnintendedInfiniteRecursionManualTest {
@Test(expected = StackOverflowError.class)
public void givenPositiveIntNoOne_whenCalFact_thenThrowsException() {
int numToCalcFactorial = 1;
UnintendedInfiniteRecursion uir = new UnintendedInfiniteRecursion();
uir.calculateFactorial(numToCalcFactorial);
}
@Test(expected = StackOverflowError.class)
public void givenPositiveIntGtOne_whenCalcFact_thenThrowsException() {
int numToCalcFactorial = 2;
UnintendedInfiniteRecursion uir = new UnintendedInfiniteRecursion();
uir.calculateFactorial(numToCalcFactorial);
}
@Test(expected = StackOverflowError.class)
public void givenNegativeInt_whenCalcFact_thenThrowsException() {
int numToCalcFactorial = -1;
UnintendedInfiniteRecursion uir = new UnintendedInfiniteRecursion();
uir.calculateFactorial(numToCalcFactorial);
}
}

22
core-java-modules/core-java-lang/src/test/java/com/baeldung/throwsexception/SimpleServiceUnitTest.java
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@@ -1,22 +0,0 @@
package com.baeldung.throwsexception;
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.*;
public class SimpleServiceUnitTest {
SimpleService simpleService = new SimpleService();
@Test
void whenSQLExceptionIsThrown_thenShouldBeRethrownWithWrappedException() {
assertThrows(DataAccessException.class,
() -> simpleService.wrappingException());
}
@Test
void whenCalled_thenNullPointerExceptionIsThrown() {
assertThrows(NullPointerException.class,
() -> simpleService.runtimeNullPointerException());
}
}

0
core-java-modules/core-java-lang/src/test/resources/correctFileNameWithoutProperExtension
View File