java多线程死锁死锁案例

蔚落 2022-03-14 11:18 463阅读 0赞

/**
     * 两个线程先分别持有两把锁，然后再去请求对方的锁，导致死锁
     */
    public class DeadLock extends Thread {
    
        private static Object obj1 = new Object();
        private static Object obj2 = new Object();
    
        public static void main(String[] args) {
    
            Thread t1 = new Thread("线程1") {
                @Override
                public void run() {
                    synchronized (obj1) {
                        System.out.println(Thread.currentThread().getName() + "已经锁住obj1");
                        try {
                            Thread.sleep(1000);
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                        synchronized (obj2) {
                            // 执行不到这里
                            System.out.println("1秒钟后，" + Thread.currentThread().getName()
                                    + "锁住obj2");
                        }
                    }
                }
            };
    
            Thread t2 = new Thread("线程2") {
                @Override
                public void run() {
                    synchronized (obj2) {
                        System.out.println(Thread.currentThread().getName() + "已经锁住obj2");
                        try {
                            Thread.sleep(1000);
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                        synchronized (obj1) {
                            // 执行不到这里
                            System.out.println("1秒钟后，" + Thread.currentThread().getName()
                                    + "锁住obj1");
                        }
                    }
                }
            };
    
            t1.start();
            t2.start();
    
    
        }
    }