达内第三课：多线程

public class MyThread extends Thread {
    public static int i=0;
    
    public static synchronized void test(int x){
        System.out.println(i+"::::");
        i=x+i;
    }
    
    public void run(){
        //the method is overwritten 
//        int i=0;
        while(true){
//            System.out.println(i+"::::");
//            i++;
            test(1);
            if(i>1000)
                break; //exit the loop 
        }
    }
    
    
    public static void main(String[] args) {
        MyThread m= new MyThread();
        
        StaticClassThread sct=new StaticClassThread();
        Thread t = new Thread(sct);
        
        m.start();
        t.start();
    }
    
    public static class StaticClassThread implements Runnable{

        @Override
        public void run() {
            // TODO Auto-generated method stub
//            int i=0;
            while(true){
//                System.out.println("::::"+i);
//                i--;
                test(-1);
                if(i<-1000)
                    break;
            }
        }
        
    }
}