exercise19_9.java

java程序设计 机械工业出版社 书籍代码

// Exercise19_9.java: Demonstrate dead lock
public class Exercise19_9 {
  private Object object1 = new Object();
  private Object object2 = new Object();

  public static void main(String[] args) {
    Exercise19_9 test = new Exercise19_9();
  }

  public Exercise19_9() {
    new Thread1().start();
    new Thread2().start();
  }

  class Thread1 extends Thread {
    public void run() {
synchronized (object1) {
  // do something
  try {
    Thread.sleep(100);
  }
  catch (InterruptedException ex) {
  }
  System.out.println("Attempt to acquire a lock on object2");

  synchronized (object2) {
    // do something
  }
}
    }
  }

  class Thread2 extends Thread {
    public void run() {
      synchronized (object2) {
        // do something
        try {
          Thread.sleep(100);
        }
        catch (InterruptedException ex) {
        }
        System.out.println("Attempt to acquire a lock on object1");

        synchronized (object1) {
          // do something
        }
      }
    }
  }
}