死锁的案例

来源：互联网发布：win10网络凭证编辑：程序博客网时间：2024/06/03 10:01

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@Overridepublic 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 blocke.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 blocke.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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