Java死锁

 1 package com.synchronizeddemo01;
 2 
 3 class Zhangsan{
 4     public void say(){
 5         System.out.println("张三对李四说：“你给我画，我就把书给你”。");
 6     }
 7     public void get(){
 8         System.out.println("张三得到了画。");
 9     }
10 }
11 class Lisi{
12     public void say(){
13         System.out.println("李四对张三说：“你给我书，我就把画给你”。");
14     }
15     public void get(){
16         System.out.println("李四得到了书。");
17     }
18 }
19 
20 public class ThreadDeadLock extends Thread {
21     private static Zhangsan zs = new Zhangsan();
22     private static Lisi ls = new Lisi();
23     private boolean flag = false;
24     public void run(){
25         if(flag){
26             synchronized (zs) {
27                 zs.say();;
28                 try{
29                     Thread.sleep(500);
30                 }catch(InterruptedException e){
31                     e.printStackTrace();
32                 }
33                 synchronized (ls) {
34                     zs.get();
35                 }
36             }
37         }else{
38             synchronized (ls) {
39                 ls.say();
40                 try{
41                     Thread.sleep(500);
42                 }catch(InterruptedException e){
43                     e.printStackTrace();
44                 }
45                 synchronized (zs) {
46                     ls.get();
47                 }
48             }
49         }
50     }
51     public static void main(String[] args) {
52         ThreadDeadLock t1 = new ThreadDeadLock();
53         ThreadDeadLock t2 = new ThreadDeadLock();
54         t1.flag = true;
55         t2.flag = false;
56         Thread thA = new Thread(t1);
57         Thread thB = new Thread(t2);
58         thA.start();
59         thB.start();
60     }
61 
62 }