多线程6---重入锁2

Posted 2020-10-16 黑土白云

1.

 1 public class SyncDubbo2 {
 2     static class Sup{ //父类
 3         public int i = 10;
 4         public synchronized void operSup(){
 5             try{
 6                 i--;
 7                 System.out.println("Sup父类  print i="+i);
 8                 Thread.sleep(1000);
 9             } catch(InterruptedException e){
10                 e.printStackTrace();
11             }
12         }
13     }
14     
15     static class Sub extends Sup{ //子类
16         public synchronized void operSub(){
17             try {
18                 while(i > 0){
19                     i--;
20                     System.out.println("sub子类 print i="+ i);
21                     Thread.sleep(1000);
22                     this.operSup();
23                 }
24             } catch (Exception e) {
25                 e.printStackTrace();
26             }
27         }
28     }
29     
30     public static void main(String[] args) {
31         Thread t1 = new Thread(new Runnable() {
32             @Override
33             public void run() {
34                 Sub sub = new Sub();
35                 sub.operSub();
36             }
37         }, "t1");
38         
39         t1.start();
40     }
41 
42     /*
43         sub子类 print i=9
44         Sup父类  print i=8
45         sub子类 print i=7
46         Sup父类  print i=6
47         sub子类 print i=5
48         Sup父类  print i=4
49         sub子类 print i=3
50         Sup父类  print i=2
51         sub子类 print i=1
52         Sup父类  print i=0
53      */
54 }

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