细说java对象的浅复制和深复制

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浅复制和深复制的区别

浅复制：仅复制它自己这个对象，不复制它所引用的对象。

深复制：复制要复制的对象和它所引用的对象。

实现浅复制和深复制，主要是使用cloneable接口的clone方法，还是比较简单的，不多说了，直接上代码。

浅复制（shallow clone）

public class Husband implements Cloneable {private int idNumber;private String name;public Husband(int idNumber, String name) {super();this.idNumber = idNumber;this.name = name;}public int getIdNumber() {return idNumber;}public void setIdNumber(int idNumber) {this.idNumber = idNumber;}public String getName() {return name;}public void setName(String name) {this.name = name;}//这里一定要public修饰，不要沿用Cloneable接口的protectedpublic Object clone() throws CloneNotSupportedException {// TODO Auto-generated method stubreturn super.clone();}}

public class ShallowCloneClient {public static void main(String[] args) throws CloneNotSupportedException {Husband husband = new Husband();husband.setIdNumber(100);husband.setName("张三");//拷贝后husband和husband2是两个对象，两个对象，两个对象……Husband husband2 = (Husband)husband.clone();System.out.println(husband2.getIdNumber() + " " + husband2.getName());}}

深复制（deep clone）

public class Husband implements Cloneable {private int idNumber;private String name;private Wife wife;public int getIdNumber() {return idNumber;}public void setIdNumber(int idNumber) {this.idNumber = idNumber;}public String getName() {return name;}public void setName(String name) {this.name = name;}public Wife getWife() {return wife;}public void setWife(Wife wife) {this.wife = wife;}//这里一定要public修饰，不要沿用Cloneable接口的protectedpublic Object clone() throws CloneNotSupportedException {// TODO Auto-generated method stubHusband husband2 = (Husband) super.clone();husband2.setWife((Wife)husband2.getWife().clone());return husband2;}}

public class Wife implements Cloneable {private int idNumber;private String name;public int getIdNumber() {return idNumber;}public void setIdNumber(int idNumber) {this.idNumber = idNumber;}public String getName() {return name;}public void setName(String name) {this.name = name;}//这里一定要public修饰，不要沿用Cloneable接口的protectedpublic Object clone() throws CloneNotSupportedException {// TODO Auto-generated method stubreturn super.clone();}}

public class DeepCloneClient {public static void main(String[] args) throws CloneNotSupportedException {Husband husband = new Husband();husband.setIdNumber(200);husband.setName("李四");Wife wife = new Wife();wife.setIdNumber(300);wife.setName("小花");husband.setWife(wife);Husband husband2 = (Husband) husband.clone();System.out.println(husband2.getIdNumber() + " " + husband2.getName());}}

DeepCloneClinet运行结果：

200 李四

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