单例设计模式-java

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
/**
 * 饿汉式
 */
class SingletonHungery{
    private static SingletonHungery s = new SingletonHungery();
    private SingletonHungery(){
 
    }
    public static SingletonHungery getInstance(){
        return s;
    }
}
 
/**
 * 懒汉式
 */
 
class SingletonLazy{
    private static SingletonLazy s;
    private SingletonLazy(){
 
    }
    public static SingletonLazy getInstance(){
        if(s == null) {
            s = new SingletonLazy();
        }
        return s;
    }
}
 
public class SingletonDemo {
    public static void main(String[] args) {
        SingletonHungery s1 = SingletonHungery.getInstance();
        SingletonHungery ss1 = SingletonHungery.getInstance();
        System.out.println(s1 == ss1);
 
        SingletonLazy s2 = SingletonLazy.getInstance();
        SingletonLazy ss2 = SingletonLazy.getInstance();
        System.out.println(s2 == ss2);
    }
 
}

 

posted on   可豆豆  阅读(87)  评论(0编辑  收藏  举报

努力加载评论中...

导航

点击右上角即可分享
微信分享提示