Java基础——死锁

多个线程同步时，如果获得的锁的顺序不一致，可能会导致线程相互等待的情况，称为死锁。

一个简单死锁的代码：

class ThreadDeadLock1 implements Runnable {

    Object o1;
    Object o2;

    public ThreadDeadLock1(Object o1, Object o2) {
        this.o1 = o1;
        this.o2 = o2;
    }

    @Override
    public void run() {
        synchronized (o1){
            try {
                Thread.sleep(100);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            synchronized (o2){

            }
        }
    }
}


class ThreadDeadLock2 implements Runnable {

    Object o1;
    Object o2;

    public ThreadDeadLock2(Object o1, Object o2) {
        this.o1 = o1;
        this.o2 = o2;
    }

    @Override
    public void run() {
        synchronized (o2){
            try {
                Thread.sleep(100);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            synchronized (o1){

            }
        }
    }
}


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

        Thread t1 = new Thread(new ThreadDeadLock1(o1, o2));
        Thread t2 = new Thread(new ThreadDeadLock2(o2, o1));

        t1.start();
        t2.start();
    }
}