Java实现的死锁示例

来源：互联网发布：网络营销推广软件编辑：程序博客网时间：2024/05/21 06:02

死锁一定要满足这个条件：线程一占用着资源A ，现在又需要申请资源B 。线程二占用着资源B ，现在又需要申请资源A

class DeadLock implements Runnable {

   public int flag = 1;
   static Object o1 = new Object(), o2 = new Object();

   public void run() {
       if (flag == 1) {
           synchronized (o1) {//对o1对象加锁
               try {
                   System.out.println(Thread.currentThread().getName()+"持有对O1锁");
                   Thread.sleep(500);
               } catch (Exception e) {
                   e.printStackTrace();
               }
               synchronized (o2) {
                   System.out.println(Thread.currentThread().getName()+"申请对O2锁");
               }
           }//对o1对象加锁
       }
       if (flag == 0) {
           synchronized (o2) {//对o2对象加锁
               try {
                   System.out.println(Thread.currentThread().getName()+"持有对O2锁");
                   Thread.sleep(500);
               } catch (Exception e) {
                   e.printStackTrace();
               }
               synchronized (o1) {
                   System.out.println(Thread.currentThread().getName()+"申请对O1锁");
               }
           }//对o2对象加锁
       }
   }

}

public class DeadLockTest {

   public static void main(String[] args) {
       DeadLock td1 = new DeadLock();
       DeadLock td2 = new DeadLock();
       td1.flag = 1;
       td2.flag = 0;
       new Thread(td1).start();
       new Thread(td2).start();

   }
}

0 0