public class TestSync implements Runnable {
    Timer t = new Timer();
    
    public static void main(String[] args) {
        TestSync ts1 = new TestSync();
        TestSync ts2 = new TestSync();
        Thread t1 = new Thread(ts1);
        Thread t2 = new Thread(ts2);
        t1.setName("t1");
        t2.setName("t2");
        t1.start();
        t2.start();
        // TODO Auto-generated method stub

    }
    
    public void run(){
        t.add(Thread.currentThread().getName());
        
    }

}

class Timer{
    private static int num = 0;
    public synchronized void add(String name){
        //synchronized (this){
        num ++;
        try{
            Thread.sleep(1);
        }catch(InterruptedException e){}
        System.out.println(name + ",你是第" + num + "个使用timer线程");
    }
    //}
}