Andrei Branza - test article shallowCopy-vs-deepCopy

xxAndreiBranza/shallowCopy-vs-deepCopy/.gitignore

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+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store

xxAndreiBranza/shallowCopy-vs-deepCopy/pom.xml

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+<?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>shallowCopy-vs-deepCopy</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <properties>
+        <java.version>21</java.version>
+        <junit.version>4.13.2</junit.version>
+        <test.scope>test</test.scope>
+        <maven.compiler.source>${java.version}</maven.compiler.source>
+        <maven.compiler.target>${java.version}</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+    <dependencies>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>${junit.version}</version>
+            <scope>${test.scope</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <version>1.18.30</version>
+            <scope>provided</scope>
+        </dependency>
+    </dependencies>
+</project>

xxAndreiBranza/shallowCopy-vs-deepCopy/src/main/java/com/baeldung/cloning/deep/Address.java

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+package com.baeldung.cloning.deep;
+
+import lombok.*;
+
+@Getter
+@Setter
+@AllArgsConstructor
+@EqualsAndHashCode
+@ToString
+public class Address implements Cloneable
+{
+	private String streetName;
+	private String cityName;
+
+	@Override
+	public Address clone() {
+		try
+		{
+			return (Address) super.clone();
+		} catch (CloneNotSupportedException cloneException)
+		{
+			throw new RuntimeException(cloneException);
+		}
+	}
+}

xxAndreiBranza/shallowCopy-vs-deepCopy/src/main/java/com/baeldung/cloning/deep/Person.java

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+package com.baeldung.cloning.deep;
+
+import lombok.*;
+
+@Getter
+@Setter
+@AllArgsConstructor
+@EqualsAndHashCode
+@ToString
+public class Person implements Cloneable
+{
+	private String firstName;
+	private String lastName;
+	private Address address;
+
+	public Person(Person personToBeCloned) {
+		Address addressToBeCloned = personToBeCloned.getAddress();
+
+		this.firstName = personToBeCloned.getFirstName();
+		this.lastName = personToBeCloned.getLastName();
+		this.address = new Address(addressToBeCloned.getStreetName(), addressToBeCloned.getCityName());
+	}
+
+	@Override
+	public Person clone() {
+		return new Person(this);
+	}
+}

xxAndreiBranza/shallowCopy-vs-deepCopy/src/main/java/com/baeldung/cloning/shallow/Address.java

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+package com.baeldung.cloning.shallow;
+
+import lombok.*;
+
+@Getter
+@Setter
+@AllArgsConstructor
+@EqualsAndHashCode
+@ToString
+public class Address implements Cloneable
+{
+	private String streetName;
+	private String cityName;
+
+	@Override
+	public Address clone() {
+		try
+		{
+			return (Address) super.clone();
+		} catch (CloneNotSupportedException cloneException)
+		{
+			throw new RuntimeException(cloneException);
+		}
+	}
+}

xxAndreiBranza/shallowCopy-vs-deepCopy/src/main/java/com/baeldung/cloning/shallow/Person.java

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+package com.baeldung.cloning.shallow;
+
+import lombok.*;
+
+@Getter
+@Setter
+@AllArgsConstructor
+@EqualsAndHashCode
+@ToString
+public class Person implements Cloneable
+{
+	private String firstName;
+	private String lastName;
+	private Address address;
+
+	@Override
+	public Person clone()  {
+        try {
+            return (Person) super.clone();
+        } catch (CloneNotSupportedException cloneException) {
+            throw new RuntimeException(cloneException);
+        }
+    }
+}

xxAndreiBranza/shallowCopy-vs-deepCopy/src/test/java/com/baeldung/cloning/deep/DeepCloningTest.java

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+package com.baeldung.cloning.deep;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotEquals;
+
+public class DeepCloningTest {
+
+	Person alex = new Person("Alex", "Jones", new Address("Main Street", "Main City"));
+
+	@Test
+	public void whenUsingDeepCopy_thenReferencesAreNotTheSame()
+	{
+		Person constructorCopyOfAlex = new Person(alex);
+
+		assertEquals(alex, constructorCopyOfAlex);
+
+		alex.setAddress(new Address("Unknown Street", "Unknown City"));
+
+		assertNotEquals(alex.getAddress(), constructorCopyOfAlex.getAddress());
+	}
+}

xxAndreiBranza/shallowCopy-vs-deepCopy/src/test/java/com/baeldung/cloning/shallow/ShallowCloningTest.java

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+package com.baeldung.cloning.shallow;
+
+import org.junit.Test;
+import static org.junit.Assert.*;
+
+public class ShallowCloningTest {
+
+	Person alex = new Person("Alex", "Jones", new Address("Main Street", "Main City"));
+
+	@Test
+	public void whenUsingShallowCopy_ThenReferencesAreTheSame()
+	{
+        Person shallowCopyOfAlex = alex.clone();
+
+		assertEquals(alex, shallowCopyOfAlex);
+
+		alex.getAddress().setCityName("Unknown City");
+
+		assertEquals(alex.getAddress(), shallowCopyOfAlex.getAddress());
+	}
+}