Thread: first cycle ten times the child thread, the main thread in a loop 20 times, then the child thread loop ten times, the main thread loop 20 times, so the cycle 50 times

First cycle ten times the child thread, the main thread in a loop 20 times, then the child thread loop ten times, the main thread loop 20 times, so the cycle 50 times

1  / * 
2  * sub-thread of the first cycle ten times, the main thread in a loop 20 times, then the sub-thread loop ten times, the main thread 20 cycles, so cycle 50 times
 . 3  * @author LLJ
 . 4  *
 . 5   * / 
. 6  public  class {ThreadTest
 . 7      
. 8      public  static  void main (String [] args) {
 . 9          Syn SYN = new new Syn ();
 10              new new the Thread ( new new the Runnable () {        
 . 11                  @Override
 12 is                  public  void RUN () {
 13 is                      for ( int I = 0 ; I <50; I ++ ) {
14                         syn.child();
15                     }
16                 }
17             }).start();
18             for(int i=0; i<50; i++) {
19                 syn.main();
20             }
21     }
22 }
23 
24 class Syn{
25     private boolean temp = true;
26     public synchronized void main() {
27         if(temp) {
28             try {
29                  the this .wait (); // causes the current thread to wait until another thread calls the object's notify () method or the notifyAll () method 
30              } the catch (InterruptedException E) {
 31 is                  e.printStackTrace ();
 32              }
 33 is          }
 34 is          for ( int I = 0; I <20 is; I ++ ) {
 35              System.out.println ( "main thread" + I);
 36          }
 37 [          TEMP = to true ;
 38 is          the this .notify (); // wakeup waiting on an object single thread monitor. 
39      }
 40      public synchronized  void child() {
41         if(!temp) {
42             try {
43                 this.wait();
44             } catch (InterruptedException e) {
45                 e.printStackTrace();
46             }
47         }    
48         for(int j=0; j<10; j++) {
49             System.out.println("子线程"+j);
50         }
51         temp = false;
52         this.notify();
53     }
54 }