public?static?void?main(String[]?args)?{
????SynchronizedObject?instance?=?new?SynchronizedObject();
????Thread?t1?=?new?Thread(instance);
????Thread?t2?=?new?Thread(instance);

????t1.start();
????t2.start();
????while?(t1.isAlive()?&&?t2.isAlive())?{

????}

????System.out.println("all?done...");
}

我的最后執行結果，all done 可能先打印出來。