Java多线程死锁示例

Z时代
2024-01-10
分类：综合

本文实例演示了Java多线程死锁。分享给大家供大家参考，具体如下：


package com.damlab.fz;
public class DeadLock {
  public static void main(String[] args) {
    Resource r1 = new Resource();
    Resource r2 = new Resource();
    // 每个线程都拥有r1,r2两个对象
    Thread myTh1 = new MyThread1(r1, r2);
    Thread myTh2 = new MyThread2(r1, r2);
    myTh1.start();
    myTh2.start();
  }
}
class Resource {
  private int i;
}
class MyThread1 extends Thread {
  private Resource r1, r2;
  public MyThread1(Resource r1, Resource r2) {
    this.r1 = r1;
    this.r2 = r2;
  }
  @Override
  public void run() {
    while (true) {
      // 先获得r1的锁，再获得r2的锁
      synchronized (r1) {
        System.out.println("1号线程获取了r1的锁");
        synchronized (r2) {
          System.out.println("1号线程获取了r2的锁");
        }
      }
    }
  }
}
class MyThread2 extends Thread {
  private Resource r1, r2;
  public MyThread2(Resource r1, Resource r2) {
    this.r1 = r1;
    this.r2 = r2;
  }
  @Override
  public void run() {
    while (true) {
      // 先获得r2的锁，再获得r1的锁
      synchronized (r2) {
        System.out.println("2号线程获取了r2的锁");
        synchronized (r1) {
          System.out.println("2号线程获取了r1的锁");
        }
      }
    }
  }
}