死锁的案例

死锁的案例

当多线程处理共享数据时，就会涉及到线程安全问题，采用同步代码块或者同步方法，资源交错，操作不当会产生死锁问题！如下是一个死锁的案例，仅供参考

class BreadMilk implements Runnable { private String milk = "牛奶";// 保证有一份 private String bread = "面包"; boolean flag;// true,t1,执行，false，t2执行 @Override public void run() { if (flag) { // t1线程执行 synchronized (milk) { System.out.println(Thread.currentThread().getName() + ",已经拥有了" + milk); try { Thread.sleep(10); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } synchronized (bread) { System.out.println(Thread.currentThread().getName() + ",即拥有" + milk + ",又拥有" + bread); } } } else { // t2线程执行 synchronized (bread) { System.out.println(Thread.currentThread().getName() + ",已经拥有了" + bread); try { Thread.sleep(10); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } synchronized (milk) { System.out.println(Thread.currentThread().getName() + ",即拥有" + bread + ",又拥有" + milk); } } } }}public class DeadLock { public static void main(String[] args) { BreadMilk mt1 = new BreadMilk(); BreadMilk mt2 = new BreadMilk(); mt1.flag = true; mt2.flag = false; Thread t1 = new Thread(mt1, "张三"); Thread t2 = new Thread(mt2, "李四"); t1.start(); t2.start(); }}

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