多线程中死锁的一个简单例子

多线程中死锁的简单理解

package com.mc.DeadThread;

//死锁，多线程抱着对方需要的资源，就形成了死锁
public class DeadLock {
    public static void main(String[] args) {

        Makeup g1=new Makeup(0,"小周");
        Makeup g2=new Makeup(1,"小周周");

        new Thread(g1).start();
        new Thread(g2).start();

    }
}

class Lipstick{
}

class Mirror{
}

class Makeup implements Runnable {

    //static保证了资源只有一份
    static Lipstick lipstick = new Lipstick();
    static Mirror mirror = new Mirror();

        int choice;  //选择
        String girlname;

    public Makeup(int choice, String girlname) {
        this.choice = choice;
        this.girlname = girlname;
    }

    @Override
    public void run() {
        //化妆
        try {
            makeup();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

    }

    private void makeup() throws InterruptedException {
        if (choice == 0) {
            synchronized (lipstick) {
                System.out.println( this.girlname+ "获得了口红的锁");
                Thread.sleep(1000);
                synchronized (mirror) {
                    System.out.println(this.girlname + "获得了镜子的锁");
                }
            }
        } else {
            synchronized (mirror) {
                System.out.println(this.girlname+ "获得了镜子的锁");
                Thread.sleep(1000);
                synchronized (lipstick) {
                    System.out.println(this.girlname+ "获得了口红的锁");
                }
            }
        }

    }
}