多线程JUC 第2季 deadlock的模拟

一  代码实操

1.1 资源

public class ObjectTools {
    public static  Object  folk=new Object();
    public static Object  chlk=new Object();
}

1.2 子线程

线程1：

public class ThreadA implements Runnable {
    @Override
    public void run() {
        synchronized (ObjectTools.chlk){
            System.out.println("线程:"+Thread.currentThread().getName()+" 获取筷子了！");
            try {
                Thread.sleep(2000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            synchronized (ObjectTools.folk){
                System.out.println("线程:"+Thread.currentThread().getName()+" 获取叉子了！");
            }
        }


    }
}

线程2：

public class ThreadB implements Runnable {

        @Override
        public void run() {
            synchronized (ObjectTools.folk){
                System.out.println("线程:"+Thread.currentThread().getName()+" 获取叉子了！");
                try {
                    Thread.sleep(2000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                synchronized (ObjectTools.chlk){
                    System.out.println("线程:"+Thread.currentThread().getName()+"  获取筷子了！");
                }
            }


        }
}

1.3 调用类

public class TestDl {
    public static void main(String[] args) {
        new Thread(new ThreadA()).start();
        new Thread(new ThreadB()).start();
    }
}

1.4 结果

1.通过 jps 查看pid ；2.通过jstack -l pid 进行排查