多线程系列教材 （五）- Java 演示多线程死锁

当业务比较复杂，多线程应用里有可能会发生死锁

步骤1:演示死锁
步骤2:练习-死锁
步骤3:答案-死锁

步骤 1 : 演示死锁

1. 线程1 首先占有对象1，接着试图占有对象2
2. 线程2 首先占有对象2，接着试图占有对象1
3. 线程1 等待线程2释放对象2
4. 与此同时，线程2等待线程1释放对象1
就会。。。一直等待下去，直到天荒地老，海枯石烂，山无棱 ，天地合。。。

package multiplethread;     import charactor.Hero;      public class TestThread {            public static void main(String[] args) {         final Hero ahri = new Hero();         ahri.name = "九尾妖狐";         final Hero annie = new Hero();         annie.name = "安妮";                   Thread t1 = new Thread(){             public void run(){                 //占有九尾妖狐                 synchronized (ahri) {                     System.out.println("t1 已占有九尾妖狐");                     try {                         //停顿1000毫秒，另一个线程有足够的时间占有安妮                         Thread.sleep(1000);                     } catch (InterruptedException e) {                         // TODO Auto-generated catch block                         e.printStackTrace();                     }                                           System.out.println("t1 试图占有安妮");                     System.out.println("t1 等待中 。。。。");                     synchronized (annie) {                         System.out.println("do something");                     }                 }                                  }         };         t1.start();         Thread t2 = new Thread(){             public void run(){                 //占有安妮                 synchronized (annie) {                     System.out.println("t2 已占有安妮");                     try {                                                   //停顿1000毫秒，另一个线程有足够的时间占有暂用九尾妖狐                         Thread.sleep(1000);                     } catch (InterruptedException e) {                         // TODO Auto-generated catch block                         e.printStackTrace();                     }                     System.out.println("t2 试图占有九尾妖狐");                     System.out.println("t2 等待中 。。。。");                     synchronized (ahri) {                         System.out.println("do something");                     }                 }                                  }         };         t2.start();    }          }

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