设计模式 | 原型模式（prototype）

package designpattern.prototype;

public class Singer implements Cloneable {
    String name;
    int age;
    HotMusic hotMusic;

    public Singer(String name, int age, HotMusic hotMusic) {
        super();
        this.name = name;
        this.age = age;
        this.hotMusic = hotMusic;
    }

    public String getName() {
        return name;
    }

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

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public HotMusic getHotMusic() {
        return hotMusic;
    }

    public void setHotMusic(HotMusic hotMusic) {
        this.hotMusic = hotMusic;
    }

    @Override
    protected Object clone() throws CloneNotSupportedException {
        Singer singerClone = (Singer) super.clone();
        singerClone.hotMusic = (HotMusic) hotMusic.clone();// 这一句，下面解释
        return singerClone;
    }

    @Override
    public String toString() {
        return "Singer [name=" + name + ", age=" + age + ", hotMusic=" + hotMusic + "]";
    }

}

package designpattern.prototype;

public class HotMusic implements Cloneable {
    String name;
    String date;

    public HotMusic(String name, String date) {
        super();
        this.name = name;
        this.date = date;
    }

    public String getName() {
        return name;
    }

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

    public String getDate() {
        return date;
    }

    public void setDate(String date) {
        this.date = date;
    }

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

    @Override
    public String toString() {
        return "HotMusic [name=" + name + ", date=" + date + "]";
    }

}

package designpattern.prototype;

public class Client {
    public static void main(String[] args) {
        Singer singer1 = new Singer("周杰伦", 40, new HotMusic("告白气球", "2016"));
        System.out.println(singer1);

        try {
            Singer singer2 = (Singer) singer1.clone();
            singer2.hotMusic.setName("等你下课");
            singer2.hotMusic.setDate("2018");
            System.out.println("========================================================");
            System.out.println(singer1);
            System.out.println(singer2);
        } catch (CloneNotSupportedException e) {
            e.printStackTrace();
        }

    }

}

Singer [name=周杰伦, age=40, hotMusic=HotMusic [name=告白气球, date=2016]]
========================================================
Singer [name=周杰伦, age=40, hotMusic=HotMusic [name=告白气球, date=2016]]
Singer [name=周杰伦, age=40, hotMusic=HotMusic [name=等你下课, date=2018]]