23种设计模式之原型模式prototype

* 当使用New关键字实例化对象的时候，很复杂，可以考虑原型模式来实现！强调内容 再则就是New对象比较耗时,克隆（clone）比较节省时间！*

浅克隆

public class Sheep implements Cloneable {
    private String name;
    private Date birthday;

    public Sheep(String name, Date birthday) {
        this.name = name;
        this.birthday = birthday;
    }

    @Override
    protected Object clone() throws CloneNotSupportedException {
        Object object = super.clone();

        return object;
    }

    public String getName() {
        return name;
    }

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

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

    @Override
    public String toString() {
        return "Sheep{" +
                "name='" + name + '\'' +
                ", birthday=" + birthday +
                '}';
    }
}

测试

  Date date = new Date();
        Sheep sheep = new Sheep("喜洋洋", date);
        System.out.println(sheep.toString());

        //修改date值
        date.setTime(1000000);
        System.out.println(sheep.getBirthday());

        Sheep s2 = (Sheep) sheep.clone();//复制一只懒洋洋
        s2.setName("懒洋洋");
        System.out.println(s2.toString());

深克隆

public class Sheep1 implements Cloneable {
    private String name;
    private Date birthday;

    public Sheep1(String name, Date birthday) {
        this.name = name;
        this.birthday = birthday;
    }

    @Override
    protected Object clone() throws CloneNotSupportedException {
        Object object = super.clone();
        Sheep1 sheep= (Sheep1) object;
        sheep.birthday= (Date) this.birthday.clone();//属性进行复制
        return object;
    }

    public String getName() {
        return name;
    }

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

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

    @Override
    public String toString() {
        return "Sheep{" +
                "name='" + name + '\'' +
                ", birthday=" + birthday +
                '}';
    }
}

测试

 Date date = new Date();
        Sheep1 sheep = new Sheep1("喜洋洋", date);
        Sheep1 s2 = (Sheep1) sheep.clone();//复制一只懒洋洋
        System.out.println(sheep.toString());

        //修改date值
        date.setTime(1000000);
        System.out.println(sheep.getBirthday());


        s2.setName("懒洋洋");
        System.out.println(s2.toString());

总结：原型模式其实就是复制，就好比，上学的时候，写试卷，你花一个小时写完，同座拿过去抄复制，只花了三分钟，并且他还自己可以修改错误。浅克隆和深克隆的区别：浅克隆相当于复制了一个自己，名字随你改，但是一些共同属性，比如毁容了啊，两个就一起毁了；深克隆就是我复制了你所有东西，然后我翻身自己当主人了。你毁容和我没关系