[转载]Java线程死锁例子

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#思路:

创建两个字符串a和b,再创建两个线程A和B, 让每个线程都用synchronized锁住字符串(A先锁a,再去锁b;B先锁b,再锁a) 如果A锁住a,B锁住b,A就没办法锁住b,B也没办法锁住a,这时就陷入了死锁

public class DeadLock {
    public static String obj1 = "obj1";
    public static String obj2 = "obj2";
    public static void main(String[] args){
        Thread a = new Thread(new Lock1());
        Thread b = new Thread(new Lock2());
        a.start();
        b.start();
    }    
}
class Lock1 implements Runnable{
    @Override
    public void run(){
        try{
            System.out.println("Lock1 running");
            while(true){
                synchronized(DeadLock.obj1){
                    System.out.println("Lock1 lock obj1");
                    // 获取obj1后先等一会儿,让Lock2有足够的时间锁住obj2
                    Thread.sleep(3000);
                    synchronized(DeadLock.obj2){
                        System.out.println("Lock1 lock obj2");
                    }
                }
            }
        }catch(Exception e){
            e.printStackTrace();
        }
    }
}
class Lock2 implements Runnable{
    @Override
    public void run(){
        try{
            System.out.println("Lock2 running");
            while(true){
                synchronized(DeadLock.obj2){
                    System.out.println("Lock2 lock obj2");
                    Thread.sleep(3000);
                    synchronized(DeadLock.obj1){
                        System.out.println("Lock2 lock obj1");
                    }
                }
            }
        }catch(Exception e){
            e.printStackTrace();
        }
    }
}

#打印结果: Result.png

原文地址:http://www.cnblogs.com/mudao/p/5867107.html