java实现死锁

参考文章: Java实现死锁的几种方式

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，这些永远在互相等待的进程称为死锁进程。

代码实现

public class Test {
    public static void main(String[] args) {
        final Object a = new Object();
        final Object b = new Object();
        Thread threadA = new Thread(new Runnable() {
            @Override
            public void run() {
                synchronized (a) {
                    try {
                        System.out.println("now i in threadA-locka");
                        Thread.sleep(1000l);
                        synchronized (b) {
                            System.out.println("now i in threadA-lockb");
                        }
                    } catch (Exception e) {
                        // ignore
                    }
                }
            }
        });

        Thread threadB = new Thread(new Runnable() {
            public void run() {
                synchronized (b) {
                    try {
                        System.out.println("now i in threadB-lockb");
                        Thread.sleep(1000l);
                        synchronized (a) {
                            System.out.println("now i in threadB-locka");
                        }
                    } catch (Exception e) {
                        // ignore
                    }
                }
            }
        });

        threadA.start();
        threadB.start();
    }
}

运行效果

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