多线程17：死锁

 1 package com.thread.syn;
 2 
 3 //死锁：多个线程互相抱着对方需要的资源，然后形成僵持
 4 public class DeadLock {
 5     public static void main(String[] args) {
 6         Makeup g1 = new Makeup(0, "灰姑凉");
 7         Makeup g2 = new Makeup(1, "白雪公主");
 8 
 9         g1.start();
10         g2.start();
11     }
12 }
13 
14 //口红
15 class Lipstick {
16 
17 }
18 
19 //镜子
20 class Mirror {
21 
22 }
23 
24 //化妆
25 class Makeup extends Thread {
26 
27     //需要的资源只有一份，用static来保证只有一份
28     static Lipstick lipstick = new Lipstick();
29     static Mirror mirror = new Mirror();
30 
31     int choice;//选择
32     String girlName;//使用化妆品的人
33 
34     Makeup(int choice, String girlName) {
35         this.choice = choice;
36         this.girlName = girlName;
37     }
38 
39 
40     @Override
41     public void run() {
42         //化妆
43         try {
44             makeup();
45         } catch (InterruptedException e) {
46             e.printStackTrace();
47         }
48     }
49 
50     //化妆，互相持有对方的锁，就是互相拿到对方的资源
51     private void makeup() throws InterruptedException {
52         if (choice == 0) {
53             synchronized (lipstick) {//获得口红的锁
54                 System.out.println(this.girlName + "获得口红的锁");
55                 Thread.sleep(1000);
56             }
57             synchronized (mirror) {//1s以后获得镜子的锁
58                 System.out.println(this.girlName + "获得镜子的锁");
59             }
60         } else {
61             synchronized (mirror) {//获得镜子的锁
62                 System.out.println(this.girlName + "获得镜子的锁");
63                 Thread.sleep(2000);
64             }
65             synchronized (lipstick) {//2s以后想获得口红的锁
66                 System.out.println(this.girlName + "获得口红的锁");
67             }
68         }
69 
70     }
71 
72 }
73 
74 结果：
75 灰姑凉获得口红的锁
76 白雪公主获得镜子的锁
77 灰姑凉获得镜子的锁
78 白雪公主获得口红的锁