Java死锁实例代码详解

死锁是指两个或两个以上的进程在执行过程中，由于竞争资源或者由于彼此通信而造成的一种阻塞的现象，若无外力作用，它们都将无法推进下去。此时称系统处于死锁状态或系统产生了死锁，这些永远在互相等待的进程称为死锁进程。

public class DeadLockDemo {

    public static void main(String[] args) {

        Resource resource1 = new Resource("资源1");
        Resource resource2 = new Resource("资源2");

        doSomething(resource1, resource2);
        doSomething(resource2, resource1);
    }

    private static void doSomething(Resource resource1, Resource resource2) {
        new Thread(()-> {
            //获取资源1的锁
            System.out.println(Thread.currentThread().getName() + "  请求" + resource1 + "的锁");
            synchronized (resource1) {
                System.out.println(Thread.currentThread().getName() + "  获取到" + resource1 + "的锁");
                try {
                    Thread.sleep(2000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                //获取资源2的锁
                System.out.println(Thread.currentThread().getName() + "  请求" + resource2 + "的锁");
                synchronized (resource2){
                    System.out.println(Thread.currentThread().getName() + "  获取到" + resource2 + "的锁");
                }
            }
        }).start();
    }
}

class Resource {

    private String name;

    public Resource(String name) {
        this.name = name;
    }

    @Override
    public String toString() {
        return this.name;
    }
}