深拷贝

1、深拷贝就是一种将一个对象完全复制一份给其他的对象，这两个对象的地址不同，当把这两个对象中的其中一个信息修改，也不会影响另一个对象的值。

深拷贝的代码：
1、拷贝对象类中的自定义引用类的创建：

package com.seccen.homework.day7;

public class Addr implements Cloneable{
    private String addr;

    public Addr(String addr) {
        this.addr = addr;
    }

    public String getAddr() {
        return addr;
    }

    public void setAddr(String addr) {
        this.addr = addr;
    }

    @Override
    protected Object clone() throws CloneNotSupportedException {
        return super.clone();
    }

    @Override
    public String toString() {
        return "Addr{" +
                "addr='" + addr + '\'' +
                '}';
    }
}

2、拷贝对象中的类的创建

package com.seccen.homework.day7;

public class User implements Cloneable{
    private int no;
    private String name;
    private char sex;
    private Addr addr;

    public User() {
    }

    public User(int no, String name, char sex, Addr addr) {
        this.no = no;
        this.name = name;
        this.sex = sex;
        this.addr = addr;
    }

    public int getNo() {
        return no;
    }

    public void setNo(int no) {
        this.no = no;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public char getSex() {
        return sex;
    }

    public void setSex(char sex) {
        this.sex = sex;
    }

    public Addr getAddr() {
        return addr;
    }

    public void setAddr(Addr addr) {
        this.addr = addr;
    }

    @Override
    public String toString() {
        return "User{" +
                "no=" + no +
                ", name='" + name + '\'' +
                ", sex=" + sex +
                ", addr=" + addr +
                '}';
    }

    @Override
    protected Object clone() throws CloneNotSupportedException {
        User user = (User)super.clone();
        user.addr = (Addr) addr.clone();
        return user;
    }
}

3、拷贝的实现

package com.seccen.homework.day7;

public class CloneTest {
    public static void main(String[] args) {
        User u1 = new User(1,"张三",'男',new Addr("江西"));
        try {
            User u2 = (User) u1.clone();
            u2.setAddr(new Addr("北京"));
            System.out.println(u1);
            System.out.println(u2);
        } catch (CloneNotSupportedException e) {
            e.printStackTrace();
        }
    }
}