java语言-简单的线程死锁

//利用抢占各自的资源实现线程死锁
package test;

public class DeadLock implements Runnable {
    private boolean flag;
    private static final Object o1 = new Object();
    private static final Object o2 = new Object();

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        DeadLock d1 = new DeadLock();
        DeadLock d2 = new DeadLock();
        d1.flag = true;
        d2.flag = false;
        new Thread(d1).start();
        new Thread(d2).start();

    }

    @Override
    public void run() {
        // TODO Auto-generated method stub
        String threadName = Thread.currentThread().getName();
        System.out.println(threadName + ":" + flag);
        if (flag == true) {
            synchronized (o1) {
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    // TODO: handle exception
                    e.printStackTrace();
                }
                System.out.println(threadName + "进入同步块o1准备进入2o2");
                synchronized (o2) {
                    System.out.println(threadName + "已经进入同步块o2");
                }
            }
        }
        if (flag == false) {
            synchronized (o2) {
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    // TODO: handle exception
                    e.printStackTrace();
                }
                System.out.println(threadName + " 同步块o2准备进入o1");
                synchronized (o1) {
                    System.out.println(threadName + "已经进入同步块o1");
                }
            }
        }

    }

}