达内第三课：多线程

 1 public class MyThread extends Thread {
 2     public static int i=0;
 3     
 4     public static synchronized void test(int x){
 5         System.out.println(i+"::::");
 6         i=x+i;
 7     }
 8     
 9     public void run(){
10         //the method is overwritten 
11 //        int i=0;
12         while(true){
13 //            System.out.println(i+"::::");
14 //            i++;
15             test(1);
16             if(i>1000)
17                 break; //exit the loop 
18         }
19     }
20     
21     
22     public static void main(String[] args) {
23         MyThread m= new MyThread();
24         
25         StaticClassThread sct=new StaticClassThread();
26         Thread t = new Thread(sct);
27         
28         m.start();
29         t.start();
30     }
31     
32     public static class StaticClassThread implements Runnable{
33 
34         @Override
35         public void run() {
36             // TODO Auto-generated method stub
37 //            int i=0;
38             while(true){
39 //                System.out.println("::::"+i);
40 //                i--;
41                 test(-1);
42                 if(i<-1000)
43                     break;
44             }
45         }
46         
47     }
48 }