mindol1004/spring-soap
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Split or move core-java-modules/core-java-lang-oop module (#7767)

Browse Source
This commit is contained in:
Catalin Burcea
2019-09-12 12:32:10 +03:00
committed by Josh Cummings
parent 71818a79cc
commit ec23ab367e
76 changed files with 124 additions and 71 deletions
Download Patch File Download Diff File Expand all files Collapse all files

26
core-java-modules/core-java-lang-oop-3/.gitignore vendored Normal file
View File

@@ -0,0 +1,26 @@
*.class
0.*
#folders#
/target
/neoDb*
/data
/src/main/webapp/WEB-INF/classes
*/META-INF/*
.resourceCache
# Packaged files #
*.jar
*.war
*.ear
# Files generated by integration tests
*.txt
backup-pom.xml
/bin/
/temp
#IntelliJ specific
.idea/
*.iml

11
core-java-modules/core-java-lang-oop-3/README.md Normal file
View File

@@ -0,0 +1,11 @@
=========
## Core Java Lang OOP 3 Cookbooks and Examples
### Relevant Articles:
- [Pass-By-Value as a Parameter Passing Mechanism in Java](http://www.baeldung.com/java-pass-by-value-or-pass-by-reference)
- [Access Modifiers in Java](http://www.baeldung.com/java-access-modifiers)
- [Guide to the super Java Keyword](http://www.baeldung.com/java-super)
- [Guide to the this Java Keyword](http://www.baeldung.com/java-this)
- [Java Public Access Modifier](https://www.baeldung.com/java-public-keyword)
- [Composition, Aggregation and Association in Java](https://www.baeldung.com/java-composition-aggregation-association)

26
core-java-modules/core-java-lang-oop-3/pom.xml Normal file
View File

@@ -0,0 +1,26 @@
<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-lang-oop-3</artifactId>
<version>0.1.0-SNAPSHOT</version>
<name>core-java-lang-oop-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>com.h2database</groupId>
<artifactId>h2</artifactId>
<version>${h2.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>

9
core-java-modules/core-java-lang-oop-3/src/main/java/com/baeldung/accessmodifiers/Public.java Normal file
View File

@@ -0,0 +1,9 @@
package com.baeldung.accessmodifiers;
public class Public {
public Public() {
SuperPublic.publicMethod(); // Available everywhere.
SuperPublic.protectedMethod(); // Available in the same package or subclass.
SuperPublic.defaultMethod(); // Available in the same package.
}
}

9
core-java-modules/core-java-lang-oop-3/src/main/java/com/baeldung/accessmodifiers/SubClass.java Normal file
View File

@@ -0,0 +1,9 @@
package com.baeldung.accessmodifiers;
public class SubClass extends SuperPublic {
public SubClass() {
SuperPublic.publicMethod(); // Available everywhere.
SuperPublic.protectedMethod(); // Available in the same package or subclass.
SuperPublic.defaultMethod(); // Available in the same package.
}
}

39
core-java-modules/core-java-lang-oop-3/src/main/java/com/baeldung/accessmodifiers/SuperPublic.java Normal file
View File

@@ -0,0 +1,39 @@
package com.baeldung.accessmodifiers;
//Only public or default access modifiers are permitted
public class SuperPublic {
// Always available from anywhere
static public void publicMethod() {
System.out.println(SuperPublic.class.getName() + " publicMethod()");
}
// Available within the same package
static void defaultMethod() {
System.out.println(SuperPublic.class.getName() + " defaultMethod()");
}
// Available within the same package and subclasses
static protected void protectedMethod() {
System.out.println(SuperPublic.class.getName() + " protectedMethod()");
}
// Available within the same class only
static private void privateMethod() {
System.out.println(SuperPublic.class.getName() + " privateMethod()");
}
// Method in the same class = has access to all members within the same class
private void anotherPrivateMethod() {
privateMethod();
defaultMethod();
protectedMethod();
publicMethod(); // Available in the same class only.
}
}
// Only public or default access modifiers are permitted
class SuperDefault {
public void publicMethod() {
System.out.println(this.getClass().getName() + " publicMethod()");
}
}

9
core-java-modules/core-java-lang-oop-3/src/main/java/com/baeldung/accessmodifiers/another/AnotherPublic.java Normal file
View File

@@ -0,0 +1,9 @@
package com.baeldung.accessmodifiers.another;
import com.baeldung.accessmodifiers.SuperPublic;
public class AnotherPublic {
public AnotherPublic() {
SuperPublic.publicMethod(); // Available everywhere.
}
}

10
core-java-modules/core-java-lang-oop-3/src/main/java/com/baeldung/accessmodifiers/another/AnotherSubClass.java Normal file
View File

@@ -0,0 +1,10 @@
package com.baeldung.accessmodifiers.another;
import com.baeldung.accessmodifiers.SuperPublic;
public class AnotherSubClass extends SuperPublic {
public AnotherSubClass() {
SuperPublic.publicMethod(); // Available everywhere.
SuperPublic.protectedMethod(); // Available in subclass. Let's note different package.
}
}

9
core-java-modules/core-java-lang-oop-3/src/main/java/com/baeldung/accessmodifiers/another/AnotherSuperPublic.java Normal file
View File

@@ -0,0 +1,9 @@
package com.baeldung.accessmodifiers.another;
import com.baeldung.accessmodifiers.SuperPublic;
public class AnotherSuperPublic {
public AnotherSuperPublic() {
SuperPublic.publicMethod(); // Available everywhere. Let's note different package.
}
}

31
core-java-modules/core-java-lang-oop-3/src/main/java/com/baeldung/accessmodifiers/publicmodifier/ListOfThree.java Normal file
View File

@@ -0,0 +1,31 @@
package com.baeldung.accessmodifiers.publicmodifier;
import java.util.AbstractList;
import java.util.Arrays;
public class ListOfThree<E> extends AbstractList<E> {
private static final int LENGTH = 3;
private Object[] elements;
public ListOfThree(E[] data) {
if(data == null
|| data.length != LENGTH)
throw new IllegalArgumentException();
this.elements = Arrays.copyOf(data, data.length); //shallow copy
}
@Override
@SuppressWarnings("unchecked")
public E get(int index) {
return (E)elements[index];
}
@Override
public int size() {
return LENGTH;
}
}

7
core-java-modules/core-java-lang-oop-3/src/main/java/com/baeldung/accessmodifiers/publicmodifier/SpecialCharacters.java Normal file
View File

@@ -0,0 +1,7 @@
package com.baeldung.accessmodifiers.publicmodifier;
public class SpecialCharacters {
public static final String SLASH = "/";
}

67
core-java-modules/core-java-lang-oop-3/src/main/java/com/baeldung/accessmodifiers/publicmodifier/Student.java Normal file
View File

@@ -0,0 +1,67 @@
package com.baeldung.accessmodifiers.publicmodifier;
import java.math.BigDecimal;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Date;
public class Student {
private StudentGrade grade; //new data representation
// private int grade; //old data representation
private String name;
private int age;
public void setGrade(int grade) {
this.grade = new StudentGrade(grade);
}
public int getGrade() {
return this.grade.getGrade().intValue(); //int is returned for backward compatibility
}
public Connection getConnection() throws SQLException {
final String URL = "jdbc:h2:~/test";
return DriverManager.getConnection(URL, "sa", "");
}
public void setAge(int age) {
if (age < 0 || age > 150) {
throw new IllegalArgumentException();
}
this.age = age;
}
public int getAge() {
return age;
}
@Override
public String toString() {
return this.name;
}
private class StudentGrade {
private BigDecimal grade = BigDecimal.ZERO;
private Date updatedAt;
public StudentGrade(int grade) {
this.grade = new BigDecimal(grade);
this.updatedAt = new Date();
}
public BigDecimal getGrade() {
return grade;
}
public Date getDate() {
return updatedAt;
}
}
}

16
core-java-modules/core-java-lang-oop-3/src/main/java/com/baeldung/keyword/KeywordDemo.java Normal file
View File

@@ -0,0 +1,16 @@
package com.baeldung.keyword;
import com.baeldung.keyword.superkeyword.SuperSub;
import com.baeldung.keyword.thiskeyword.KeywordUnitTest;
/**
* Created by Gebruiker on 5/14/2018.
*/
public class KeywordDemo {
public static void main(String[] args) {
KeywordUnitTest keyword = new KeywordUnitTest();
SuperSub child = new SuperSub("message from the child class");
}
}

20
core-java-modules/core-java-lang-oop-3/src/main/java/com/baeldung/keyword/superkeyword/SuperBase.java Normal file
View File

@@ -0,0 +1,20 @@
package com.baeldung.keyword.superkeyword;
/**
* Created by Gebruiker on 5/14/2018.
*/
public class SuperBase {
String message = "super class";
public SuperBase() {
}
public SuperBase(String message) {
this.message = message;
}
public void printMessage() {
System.out.println(message);
}
}

26
core-java-modules/core-java-lang-oop-3/src/main/java/com/baeldung/keyword/superkeyword/SuperSub.java Normal file
View File

@@ -0,0 +1,26 @@
package com.baeldung.keyword.superkeyword;
/**
* Created by Gebruiker on 5/15/2018.
*/
public class SuperSub extends SuperBase {
String message = "child class";
public SuperSub(String message) {
super(message);
}
public SuperSub() {
super.printMessage();
printMessage();
}
public void getParentMessage() {
System.out.println(super.message);
}
public void printMessage() {
System.out.println(message);
}
}

49
core-java-modules/core-java-lang-oop-3/src/main/java/com/baeldung/keyword/thiskeyword/KeywordUnitTest.java Normal file
View File

@@ -0,0 +1,49 @@
package com.baeldung.keyword.thiskeyword;
public class KeywordUnitTest {
private String name;
private int age;
public KeywordUnitTest() {
this("John", 27);
this.printMessage();
printInstance(this);
}
public KeywordUnitTest(String name, int age) {
this.name = name;
this.age = age;
}
public void printMessage() {
System.out.println("invoked by this");
}
public void printInstance(KeywordUnitTest thisKeyword) {
System.out.println(thisKeyword);
}
public KeywordUnitTest getCurrentInstance() {
return this;
}
class ThisInnerClass {
boolean isInnerClass = true;
public ThisInnerClass() {
KeywordUnitTest thisKeyword = KeywordUnitTest.this;
String outerString = KeywordUnitTest.this.name;
System.out.println(this.isInnerClass);
}
}
@Override
public String toString() {
return "KeywordTest{" +
"name='" + name + '\'' +
", age=" + age +
'}';
}
}

9
core-java-modules/core-java-lang-oop-3/src/main/java/com/baeldung/relationships/aggregation/Car.java Normal file
View File

@@ -0,0 +1,9 @@
package com.baeldung.relationships.aggregation;
import java.util.List;
public class Car {
private List<Wheel> wheels;
}

13
core-java-modules/core-java-lang-oop-3/src/main/java/com/baeldung/relationships/aggregation/CarWithStaticInnerWheel.java Normal file
View File

@@ -0,0 +1,13 @@
package com.baeldung.relationships.aggregation;
import java.util.List;
public class CarWithStaticInnerWheel {
private List<Wheel> wheels;
public static class Wheel {
}
}

7
core-java-modules/core-java-lang-oop-3/src/main/java/com/baeldung/relationships/aggregation/Wheel.java Normal file
View File

@@ -0,0 +1,7 @@
package com.baeldung.relationships.aggregation;
public class Wheel {
private Car car;
}

7
core-java-modules/core-java-lang-oop-3/src/main/java/com/baeldung/relationships/association/Child.java Normal file
View File

@@ -0,0 +1,7 @@
package com.baeldung.relationships.association;
public class Child {
private Mother mother;
}

9
core-java-modules/core-java-lang-oop-3/src/main/java/com/baeldung/relationships/association/Mother.java Normal file
View File

@@ -0,0 +1,9 @@
package com.baeldung.relationships.association;
import java.util.List;
public class Mother {
private List<Child> children;
}

18
core-java-modules/core-java-lang-oop-3/src/main/java/com/baeldung/relationships/composition/Building.java Normal file
View File

@@ -0,0 +1,18 @@
package com.baeldung.relationships.composition;
import java.util.List;
public class Building {
private String address;
private List<Room> rooms;
public class Room {
public String getBuildingAddress() {
return Building.this.address;
}
}
}

28
core-java-modules/core-java-lang-oop-3/src/main/java/com/baeldung/relationships/composition/BuildingWithDefinitionRoomInMethod.java Normal file
View File

@@ -0,0 +1,28 @@
package com.baeldung.relationships.composition;
public class BuildingWithDefinitionRoomInMethod {
public Room createAnonymousRoom() {
return new Room() {
@Override
public void doInRoom() {}
};
}
public Room createInlineRoom() {
class InlineRoom implements Room {
@Override
public void doInRoom() {}
}
return new InlineRoom();
}
public Room createLambdaRoom() {
return () -> {};
}
public interface Room {
void doInRoom();
}
}

9
core-java-modules/core-java-lang-oop-3/src/main/java/com/baeldung/relationships/university/Department.java Normal file
View File

@@ -0,0 +1,9 @@
package com.baeldung.relationships.university;
import java.util.List;
public class Department {
private List<Professor> professors;
}

10
core-java-modules/core-java-lang-oop-3/src/main/java/com/baeldung/relationships/university/Professor.java Normal file
View File

@@ -0,0 +1,10 @@
package com.baeldung.relationships.university;
import java.util.List;
public class Professor {
private List<Department> department;
private List<Professor> friends;
}

9
core-java-modules/core-java-lang-oop-3/src/main/java/com/baeldung/relationships/university/University.java Normal file
View File

@@ -0,0 +1,9 @@
package com.baeldung.relationships.university;
import java.util.List;
public class University {
private List<Department> department;
}

94
core-java-modules/core-java-lang-oop-3/src/test/java/com/baeldung/accessmodifiers/PublicAccessModifierUnitTest.java Normal file
View File

@@ -0,0 +1,94 @@
package com.baeldung.accessmodifiers;
import com.baeldung.accessmodifiers.publicmodifier.ListOfThree;
import com.baeldung.accessmodifiers.publicmodifier.Student;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.TestInstance;
import org.junit.jupiter.api.TestInstance.Lifecycle;
import java.math.BigDecimal;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;
import static org.junit.jupiter.api.Assertions.assertEquals;
@TestInstance(Lifecycle.PER_CLASS)
public class PublicAccessModifierUnitTest {
@Test
public void whenUsingBigDecimalIntValueMethod_correspondingIntIsReturned() {
assertEquals(0, new BigDecimal(0).intValue()); //instance member
}
@Test
public void whenUsingIntegerMaxValueField_maxPossibleIntValueIsReturned() {
assertEquals(2147483647, Integer.MAX_VALUE); //static field
}
@Test
public void whenChangingStudentInternalRepresentation_clientCodeWillNotBreak() {
Student student = new Student();
student.setGrade(100);
assertEquals(100, student.getGrade());
}
@Test
public void whenUsingEntrySet_keyValuePairsAreReturned() {
Map<String, String> mapObject = new HashMap<String, String>();
mapObject.put("name", "Alex");
for(Map.Entry<String, String> entry : mapObject.entrySet()) {
assertEquals("name", entry.getKey());
assertEquals("Alex", entry.getValue());
}
}
@Test
public void whenUsingStringToLowerCase_stringTurnsToLowerCase() {
assertEquals("alex", "ALEX".toLowerCase());
}
@Test
public void whenParsingStringOne_parseIntReturns1() {
assertEquals(1, Integer.parseInt("1"));
}
@Test
public void whenConnectingToH2_connectionInstanceIsReturned() throws SQLException {
final String url = "jdbc:h2:~/test";
Connection conn = DriverManager.getConnection(url, "sa", "");
assertNotNull(conn);
}
@Test
public void whenCreatingCustomList_concreteAndInheritedMethodsWork() {
String[] dataSet1 = new String[] {"zero", "one", "two"};
List<String> list1 = new ListOfThree<String>(dataSet1);
//our implemented methods
assertEquals("one", list1.get(1));
assertEquals(3, list1.size());
//inherited implementations
assertEquals(1, list1.indexOf("one"));
String[] dataSet2 = new String[] {"two", "zero", "one"};
List<String> list2 = new ListOfThree<String>(dataSet2);
assertTrue(list1.containsAll(list2));
}
}

37
core-java-modules/core-java-lang-oop-3/src/test/java/com/baeldung/parameterpassing/NonPrimitivesUnitTest.java Normal file
View File

@@ -0,0 +1,37 @@
package com.baeldung.parameterpassing;
import org.junit.Assert;
import org.junit.Test;
public class NonPrimitivesUnitTest {
@Test
public void whenModifyingObjects_thenOriginalObjectChanged() {
Foo a = new Foo(1);
Foo b = new Foo(1);
// Before Modification
Assert.assertEquals(a.num, 1);
Assert.assertEquals(b.num, 1);
modify(a, b);
// After Modification
Assert.assertEquals(a.num, 2);
Assert.assertEquals(b.num, 1);
}
public static void modify(Foo a1, Foo b1) {
a1.num++;
b1 = new Foo(1);
b1.num++;
}
}
class Foo {
public int num;
public Foo(int num) {
this.num = num;
}
}

28
core-java-modules/core-java-lang-oop-3/src/test/java/com/baeldung/parameterpassing/PrimitivesUnitTest.java Normal file
View File

@@ -0,0 +1,28 @@
package com.baeldung.parameterpassing;
import org.junit.Assert;
import org.junit.Test;
public class PrimitivesUnitTest {
@Test
public void whenModifyingPrimitives_thenOriginalValuesNotModified() {
int x = 1;
int y = 2;
// Before Modification
Assert.assertEquals(x, 1);
Assert.assertEquals(y, 2);
modify(x, y);
// After Modification
Assert.assertEquals(x, 1);
Assert.assertEquals(y, 2);
}
public static void modify(int x1, int y1) {
x1 = 5;
y1 = 10;
}
}