public class Test {

    class TestRunnable implements Runnable {

        private String TName="TName";
        private Object obj=new Object();
        private int a=5;
        public void run() {

            synchronized (obj) {

                a--;
                if (a <= 0) {
                    System.out
 
.println(TName + " notifyALL:" + a);
obj.notifyAll();
} else {
                    System.out.println(TName + " wait:" + a);
                    try {
                        obj.wait();
} catch (InterruptedException e) {
                        e.printStackTrace();
}
                }
            }


            System.out
 
.println(TName + " relese :" + a);
}
    }

    public static void main (String[] args){

        System.out.println("hello word");
Test t=new Test();
Runnable run_a=t.new TestRunnable();
        for(int i=0; i<5;i++){
            new Thread(run_a).start();
}

    }
}

// wait是讓使用wait方法的物件等待，暫時先把物件鎖給讓出來，給其它持有該鎖的物件用，其它物件用完後再告知（notify）等待的那個物件可以繼續執//  行了，整個過程就是這樣