java小例子实现死锁

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死锁问题用通俗的语言来描述就是: 要进入一个房间要开2扇门,A用钥匙1开了第一扇门,但没有第二把钥匙,而B拥有钥匙2,但却无法打开第一扇门.

用java代码来实现:不同的线程使用同一个类的对象,因此要共享该MyThread类的空间.

public class DeadLock {

public static void main(String[] args) {
  new DeadLock().begin();
}

public void begin() {
  MyThread mt = new MyThread();
  Thread t1 = new Thread(mt, "mt1");
  Thread t2 = new Thread(mt, "mt2");
  t1.start();
  t2.start();
}

class MyThread implements Runnable {

  private Object key1 = new Object();
  private Object key2 = new Object();
  private boolean flag = true;

  @Override
  public void run() {
   if (flag) {
    flag = false;
    synchronized (key1) {
     System.out.println(Thread.currentThread().getName() + ":key1");
     synchronized (key2) {
      System.out.println(Thread.currentThread().getName() + ":key2");
     }
    }
   } else {
    synchronized (key2) {
     System.out.println(Thread.currentThread().getName() + ":key2");
     synchronized (key1) {
      System.out.println(Thread.currentThread().getName() + ":key1");
     }
    }
   }
  }

}
}

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