java 多线程 死锁 举例

<pre name="code" class="java">package comd;public class Sisuo {public static void main(String[] args) {First first = new First();second second = new second();first.start();second.start();}}class First extends Thread{public void run() {synchronized (lock.o1) {System.out.println("锁住a");synchronized (lock.o2) {System.out.println("得到b");}}}}class second extends Thread{public void run() {synchronized (lock.o2) {System.out.println("锁住b");synchronized (lock.o1) {System.out.println("得到a");}}}}class lock{static Object o1 = new Object();static Object o2 = new Object();}