public class Main {
    public static void main(String[] args) {
        Object obj1 = new Object();
        Object obj2 = new Object();
        new Thread(new Runnable() {
            public void run() {
                synchronized (obj1) {
                    System.out.println("thread1 鎖為 obj1");
                    try
 
 {
                        Thread.sleep(1000);//為了保證執行緒thread2啟動獲得obj2鎖
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    synchronized (obj2) {
                        System.out.println("thread1 鎖為 obj2");
                    }
                }
            }
        }).start();
        new
 
 Thread(new Runnable() {
            public void run() {
                synchronized (obj2) {
                    System.out.println("thread2 鎖為 obj2");
                    synchronized (obj1) {
                        System.out.println("thread2 鎖為 obj1");
                    }
                }
            }
        }).start();
    }
}