5분 만에 마스터 프로토타입 모드

//用户地址信息
public class UserAddress  implements Serializable{
    private String province;
    private String cityCode;

    public UserAddress(String province, String cityCode) {
        this.province = province;
        this.cityCode = cityCode;
    }
}
//用户信息
public class User implements Cloneable {
    private int age;
    private String name;
    //用户地址信息
    private UserAddress userAddress;

    //getter setter 省略

    @Override
    protected Object clone() throws CloneNotSupportedException { 
        return super.clone();
    }
}
//测试
public class UserTest {
    public static void main(String[] args) throws Exception {
        User user = new User();
        user.setAge(20);
        user.setName("田维常");
        UserAddress userAddress = new UserAddress("贵州", "梵净山");
        user.setUserAddress(userAddress);

        User clone = (User) user.clone();

        System.out.println("克隆前后UserAddress比较：" + (user.getUserAddress() == clone.getUserAddress()));
    }
}

克隆前后 UserAddress 比较：true

//猴子，有身高体重和生日
public class Monkey {
    public int height;
    public int weight;
    public Date birthday;
}

import java.io.Serializable;
//孙悟空的金箍棒
public class JinGuBang implements Serializable{
    public float  h=100;
    public float  d=10;
    //金箍棒变大
    public void big(){
        this.h *=10;
        this.d *=10;
    }
    //金箍棒变小
    public void small(){
        this.h /=10;
        this.d /=10;
    }
}

import java.io.*;
import java.util.Date;

//孙悟空有七十二变,拔猴毛生成一个金箍棒
//使用JDK的克隆机制，
//实现Cloneable并重写clone方法
public class QiTianDaSheng extends Monkey implements Cloneable, Serializable {

    public JinGuBang jinGuBang;

    public QiTianDaSheng() {
        this.birthday = new Date();
        this.jinGuBang = new JinGuBang();
    }

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

    //深克隆
    public QiTianDaSheng deepClone() {
        try {
            //内存中操作完成、对象读写，是通过字节码直接操作
            //与序列化操作类似
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            ObjectOutputStream oos = new ObjectOutputStream(bos);
            oos.writeObject(this);

            ByteArrayInputStream bais = new ByteArrayInputStream(bos.toByteArray());
            ObjectInputStream bis = new ObjectInputStream(bais);

            //完成一个新的对象,底层是使用new创建的一个对象
            //详情可以了解readObject方法
            QiTianDaSheng qiTianDaSheng = (QiTianDaSheng) bis.readObject();
            //每个猴子的生日不一样，所以每次拷贝的时候，把生日改一下
            qiTianDaSheng.birthday = new Date();
            return qiTianDaSheng;
        } catch (Exception ex) {
            ex.printStackTrace();
            return null;
        }
    }

    //浅克隆，就是简单的赋值
    public QiTianDaSheng shalllowClone(QiTianDaSheng target) {
        QiTianDaSheng qiTianDaSheng = new QiTianDaSheng();
        qiTianDaSheng.height = target.height;
        qiTianDaSheng.weight = target.weight;

        qiTianDaSheng.jinGuBang = target.jinGuBang;
        qiTianDaSheng.birthday = new Date();
        return qiTianDaSheng;

    }
}

public class DeepCloneTest {
    public static void main(String[] args) {
        QiTianDaSheng qiTianDaSheng = new QiTianDaSheng();
        try {
            QiTianDaSheng newObject = (QiTianDaSheng) qiTianDaSheng.clone();
            System.out.print("深克隆后 ");
            System.out.println("金箍棒是否一直：" + (qiTianDaSheng.jinGuBang == newObject.jinGuBang));
            
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        
        QiTianDaSheng newObject=qiTianDaSheng.shalllowClone(qiTianDaSheng);
        System.out.print("浅克隆后 ");
        System.out.println("金箍棒是否一直：" + (qiTianDaSheng.jinGuBang == newObject.jinGuBang));
    }
}

深克隆后 金箍棒是否一直：false
浅克隆后 金箍棒是否一直：true