package net.peace.Thread;
/**
*
* @ClassName: TestDeadLock
* @Description: 测试死锁
* @author peace w_peace@163.com
* @date Sep 19, 2015 4:24:06 PM
*
*/
public class TestDeadLock {
public static void main(String[] args) {
new TestDeadLock().run();
}
public void run() {
//建立两个任务,每个任务都只能在另外一个任务执行完才能继续执行;
MyThread mt = new MyThread();
new Thread(mt,"张三").start();
new Thread(mt,"李四").start();
}
//产生死锁的类
class MyThread implements Runnable {
//第一个钥匙
private Object k1 = new Object();
//第二个钥匙
private Object k2 = new Object();
//标示位
private boolean flag = true;
@Override
public void run() {
if(flag) {
flag = false;
//死锁产生原因,有嵌套。当第一个线程进来的时候,将k1钥匙拿在手里,睡眠。并等待k2钥匙
synchronized (k1) {
System.out.println(Thread.currentThread().getName()+":k1");
try {
Thread.sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
}
//此去等待由于k2被线程2拿着,多以此处一直等待
synchronized (k2) {
System.out.println(Thread.currentThread().getName()+":k2");
}
}
} else {
//当第二个线程进来的时候,将k2钥匙拿在手里,睡眠。并等待k1钥匙
flag = true;
synchronized (k2) {
System.out.println(Thread.currentThread().getName()+":k2");
try {
Thread.sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
}
//此去等待由于k1被线程1拿着,多以此处一直等待 产生死锁
synchronized (k1) {
System.out.println(Thread.currentThread().getName()+":k1");
}
}
}
}
}
}