Java多线程开启三个线程输出ABC10次

 1 public class ABC {
 2 
 3     private static int mark = 0;
 4 
 5     private static Object obj = new Object();
 6     
 7     public static void main(String[] args) throws Exception {
 8         ABC abc = new ABC();
 9         new Thread(abc.new PrintA()).start();
10         new Thread(abc.new PrintB()).start();
11         new Thread(abc.new PrintC()).start();
12     }
13     
14     class PrintA implements Runnable{
15 
16         @Override
17         public void run() {
18             for(int i = 0; i < 10; i++){
19                 synchronized (obj){
20                     while(mark %3 != 0){
21                         try {
22                             obj.wait();
23                         } catch (InterruptedException e) {
24                             e.printStackTrace();
25                         }
26                     }
27                     System.out.print("A");
28                     mark ++;
29                     obj.notifyAll();
30                 }
31             }
32         }
33     }
34     class PrintB implements Runnable{
35 
36         @Override
37         public void run() {
38             for(int i = 0; i < 10; i++){
39                 synchronized (obj){
40                     while(mark %3 != 1){
41                         try {
42                             obj.wait();
43                         } catch (InterruptedException e) {
44                             e.printStackTrace();
45                         }
46                     }
47                     System.out.print("B");
48                     mark ++;
49                     obj.notifyAll();
50                 }
51             }
52         }
53     }
54     class PrintC implements Runnable{
55 
56         @Override
57         public void run() {
58             for(int i = 0; i < 10; i++){
59                 synchronized (obj){
60                     while(mark %3 != 2){
61                         try {
62                             obj.wait();
63                         } catch (InterruptedException e) {
64                             e.printStackTrace();
65                         }
66                     }
67                     System.out.println("C");
68                     mark ++;
69                     obj.notifyAll();
70                 }
71             }
72         }
73     }
74 }