Java死锁的简单例子

两个线程互相占有对方需要的资源而不释放，便形成了死锁。

代码如下：
Program.java

/** * 程序类 * @author michael * */public class Program implements Runnable {    //两个静态的资源    public static Object obj1 = new Object();    public static Object obj2 = new Object();    //标志位    public int flag = 1;    //1 or 2    @Override    public void run() {        if(flag == 1) {            synchronized (obj1) {                System.out.println("flag: " + flag + ", 锁住了资源obj1");                try {                    Thread.sleep(500);                } catch (InterruptedException e) {                    // TODO Auto-generated catch block                    e.printStackTrace();                }                System.out.println("flag: " + flag + ", 等待获取资源obj2");                synchronized (obj2) {                    System.out.println("flag: " + flag + ", 获得资源obj2");                }            }        } else if(flag == 2) {            synchronized (obj2) {                System.out.println("flag: " + flag + ", 锁住了资源obj2");                try {                    Thread.sleep(500);                } catch (InterruptedException e) {                    // TODO Auto-generated catch block                    e.printStackTrace();                }                System.out.println("flag: " + flag + ", 等待获取资源obj1");                synchronized (obj1) {                    System.out.println("flag: " + flag + ", 获得资源obj1");                }            }        }       }}

DeadLock.java

DeadLock.java/** * 死锁测试. * @author michael * */public class DeadLock {    public static void main(String[] args) {        Program p1 = new Program();        Program p2 = new Program();        p1.flag = 1;        p2.flag = 2;        new Thread(p1).start();        new Thread(p2).start();    }}

控制台结果：