写一个java死锁的demo

Posted 2020-09-30

package com.simon.study;
/**
 * 线程死锁 一个线程要同时拥有两个对象的资源才能进行下一步操作；
 * @author: Simon
 * @date: 2017年7月29日 下午9:48:43
 */
public class DeadLock implements Runnable{
  static Object o1=new Object(),o2=new Object();
  public int flag=1;
 
 
     public void run() {
           // TODO Auto-generated method stub
           System.out.println("flag***********"+flag);
           if(flag==1){
                synchronized (o1) {
                      try {
                           Thread.sleep(500);
                      } catch (Exception e) {
                           // TODO: handle exception
                      }
                      synchronized (o2) {
                           System.out.println("这里线程1获取所有的线程权限");
                      }
                }
                
                }
           if(flag==0){
                synchronized (o2) {
                      try {
                           Thread.sleep(500);
                      } catch (Exception e) {
                           // TODO: handle exception
                      }
                      synchronized (o1) {
                           System.out.println("这里线程2获取所有的线程权限");
                      }
                }
                
           }
           }
     public static void main(String[] args){
           DeadLock deadLock1=new DeadLock();
           DeadLock deadLock2=new DeadLock();
           deadLock1.flag=1;
           deadLock2.flag=0;
           Thread r1=new Thread(deadLock1);
           Thread r2=new Thread(deadLock2);
           r1.start();
           r2.start();
     }
     }