關於Java多線程“死鎖”示例

Java中多線程死鎖示例

/*
死鎖
 */
public class DeadLock {
    public static void main(String[] args) {
        Object o1 = new Object();
        Object o2 = new Object();

        //兩個線程同時操作o1，o2
        MyThread1 myThread1 = new MyThread1(o1,o2);
        MyThread2 myThread2 = new MyThread2(o1,o2);

        //啓動線程
        myThread1.start();
        myThread2.start();
    }
}

class MyThread1 extends Thread{
    Object O1;
    Object O2;

    public MyThread1(Object o1, Object o2) {
        O1 = o1;
        O2 = o2;
    }

    @Override
    public void run() {
        synchronized (O1){
            try {
                Thread.sleep(1000); //這裏睡一會，必定導致死鎖現象。
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            synchronized (O2){

            }
        }
    }
}

class MyThread2 extends Thread{
    Object O1;
    Object O2;

    public MyThread2(Object o1, Object o2) {
        O1 = o1;
        O2 = o2;
    }

    @Override
    public void run() {
        synchronized (O2){
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            synchronized (O1){

            }
        }
    }
}