学习笔记——原型模式

模拟实现:

import java.util.Date;

/**
*原型模式: 通过一个已经创建好的对象来克隆出同样的其他对象(属性一样，通过实现Cloneable接口来实现)，
* 分为深拷贝和浅拷贝，要进行深拷贝，需要对原对象的引用类型属性也进行拷贝，或者用序列化的方式也可以实现深拷贝
* 该模式有利于减少创建对象所耗费的时间，直接将内存中已有的对象进行拷贝，出去了new对象时的初始化，再赋值等一系列操作
 */
public class Test {
    public static void main(String[] args) throws CloneNotSupportedException {
        Date date = new Date();
        User user = new User("张三", date);
        System.out.println(user.getName());
        System.out.println(user.getBirthday());
        System.out.println(user);
        System.out.println("===============");

        User user2 = (User)user.clone();
        date.setTime(5000000L);
        user2.setName("李四");
        System.out.println(user2.getName());
        System.out.println(user2.getBirthday());
        System.out.println(user2);
    }
}

import java.util.Date;

public class User implements Cloneable {
    public User(){

    }

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

    public Date getBirthday() {
        return birthday;
    }

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

    public String getName() {
        return name;
    }

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

    @Override
    public Object clone() throws CloneNotSupportedException {
        Date date = (Date)this.birthday.clone();
        User user = (User)super.clone();
        user.setBirthday(date);
        return user;
    }

    private String name;
    private Date birthday;
}