public class DeadLock {public static void main(String[] args) {Object lock1 = new Object();Object lock2 = new Object();new Thread(new A(lock1,lock2),"线程A").start();new Thread(new B(lock1,lock2),"线程B").start();}
}class A implements Runnable {final private Object lock1;final private Object lock2;public A(Object lock1, Object lock2) {this.lock1 = lock1;this.lock2 = lock2;}@Overridepublic void run() {// 先拿第一个锁，再拿第二个锁synchronized (lock1) {System.out.println(Thread.currentThread().getName() + "拿到了第一个锁");try {Thread.sleep(100);} catch (InterruptedException e) {e.printStackTrace();}synchronized (lock2) {System.out.println(Thread.currentThread().getName() + "拿到了第二个锁");}}}
}class B implements Runnable {final private Object lock1;final private Object lock2;public B(Object lock1, Object lock2) {this.lock1 = lock1;this.lock2 = lock2;}@Overridepublic void run() {// 先拿第二个锁，再拿第一个锁synchronized (lock2) {System.out.println(Thread.currentThread().getName() + "拿到了第二个锁");try {Thread.sleep(100);} catch (InterruptedException e) {e.printStackTrace();}synchronized (lock1) {System.out.println(Thread.currentThread().getName() + "拿到了第一个锁");}}}
}

输出结果：