java synchronized死锁的好例子

关于java死锁的一个好demo。要避免dead-lock，就应该控制同步的数量和可能共用的资源的访问（代码源于网上，略加修改）

/** * @author yicong * @date 2016年3月22日 下午1:44:32 * @todo 死锁的经典例子 */public class DeadLock {public static void main(String[] args) {// These are the two resource objects we'll try to get locks forfinal Object resource1 = "resource1";final Object resource2 = "resource2";// Here's the first thread. It tries to lock resource1 then resource2Thread t1 = new Thread() {public void run() {// Lock resource 1synchronized (resource1) {System.out.println("Thread 1: locked resource 1");// Pause for a bit, simulating some file I/O or// something. Basically, we just want to give the// other thread a chance to run. Threads and deadlock// are asynchronous things, but we're trying to force// deadlock to happen here...try {Thread.sleep(50);}catch (InterruptedException e) {}// Now wait 'till we can get a lock on resource 2synchronized (resource2) {while (true) {System.out.println("Thread 1: locked resource 2");try {Thread.sleep(10000);}catch (InterruptedException e) {}}}}}};// Here's the second thread. It tries to lock resource2 then resource1Thread t2 = new Thread() {public void run() {// This thread locks resource 2 right awaysynchronized (resource2) {System.out.println("Thread 2: locked resource 2");// Then it pauses, just like the first thread.try {Thread.sleep(50);}catch (InterruptedException e) {}// Then it tries to lock resource1. But wait! Thread 1// locked resource1, and won't release it 'till it// gets a lock on resource2. This thread holds the// lock on resource2, and won't release it 'till it// gets resource1. We're at an impasse(僵局). Neither// thread can run, and the program freezes up.synchronized (resource1) {System.out.println("Thread 2: locked resource 1");}}}};// Start the two threads. If all goes as planned, deadlock will occur, and the program will never exit.t1.start();t2.start();}}