java例程练习（多线程[死锁问题]）

/* *死锁产生有2个原因： *1，资源竞争 *2，进程间的推进顺序非法 * *程序模拟的是第一个情况 */ public class TestDeadLock implements Runnable { public int flag = 1; static Object o1 = new Object(); static Object o2 = new Object(); public void run() { System.out.println("flag=" + flag); if(flag == 1) { synchronized(o1) { try { Thread.sleep(500); } catch(InterruptedException e) { e.printStackTrace(); } synchronized(o2) { System.out.println("1"); } } } if(flag == 0) { synchronized(o2) { try { Thread.sleep(500); } catch(InterruptedException e) { e.printStackTrace(); } synchronized(o1) { System.out.println("0"); } } } } public static void main(String[] args) { TestDeadLock td1 = new TestDeadLock(); TestDeadLock td2 = new TestDeadLock(); td1.flag = 1;//用flag区分不同的线程 td2.flag = 0; Thread t1 = new Thread(td1); Thread t2 = new Thread(td2); t1.start(); t2.start(); } }

转载于:https://www.cnblogs.com/springside5/archive/2012/05/05/2486211.html