学习笔记——原型模式

模拟实现:

 1 import java.util.Date;
 2 
 3 /**
 4 *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)，
 5 * 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
 6 * 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
 7  */
 8 public class Test {
 9     public static void main(String[] args) throws CloneNotSupportedException {
10         Date date = new Date();
11         User user = new User("张三", date);
12         System.out.println(user.getName());
13         System.out.println(user.getBirthday());
14         System.out.println(user);
15         System.out.println("===============");
16 
17         User user2 = (User)user.clone();
18         date.setTime(5000000L);
19         user2.setName("李四");
20         System.out.println(user2.getName());
21         System.out.println(user2.getBirthday());
22         System.out.println(user2);
23     }
24 }

View Code

 1 import java.util.Date;
 2 
 3 public class User implements Cloneable {
 4     public User(){
 5 
 6     }
 7 
 8     public User(String name, Date birthday) {
 9         this.name = name;
10         this.birthday = birthday;
11     }
12 
13     public Date getBirthday() {
14         return birthday;
15     }
16 
17     public void setBirthday(Date birthday) {
18         this.birthday = birthday;
19     }
20 
21     public String getName() {
22         return name;
23     }
24 
25     public void setName(String name) {
26         this.name = name;
27     }
28 
29     @Override
30     public Object clone() throws CloneNotSupportedException {
31         Date date = (Date)this.birthday.clone();
32         User user = (User)super.clone();
33         user.setBirthday(date);
34         return user;
35     }
36 
37     private String name;
38     private Date birthday;
39 }

View Code