线程交替题目

package dong;
public class WaitAndNotify {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        final Temp temp = new Temp();
        new Thread(new Runnable() {
            
            @Override
            public void run() {
                for (int i = 1; i <= 50; i++) {
                    temp.sub(i);
                }
            }
        }).start();
        for (int i = 1; i <= 50; i++) {
            temp.main(i);
        }
        
    }
    

}
class Temp {
    private boolean flag = true;
    public synchronized void main(int j){
        if (flag) {
            try {
                wait();
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        for (int i = 1; i <= 100; i++) {
            System.out.println("main=="+j+"==="+i+"===="+Thread.currentThread().getName());
        }
        flag = true;
//      flag = !flag;
        notify();
    }
    public synchronized void sub(int j){
        if (!flag) {
            try {
                wait();
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        for (int i = 1; i <= 10; i++) {
            System.out.println("sub++++"+j+"+++++"+i+"++++++++++++"+Thread.currentThread().getName());
        }
        flag = false;
//      flag = !flag;
        notify();
    }
}