概述

互相要對方正在佔有的鎖，導致卡住不動

例項

/**
 * 死鎖
 */
public class TestDeadLock {
    public static void main(String[] args) {
        new MakeUp(0,"嘟嘟").start();
        new MakeUp(1,"dudu").start();
    }
}
//鏡子
class Mirror{

}
//口紅
class Lipstick{

}
//化妝
class MakeUp extends Thread{
    static Mirror mirror = new Mirror();
    static Lipstick lipstick = new Lipstick();
    private int select;
    private String name;

    public MakeUp(int select, String name) {
        this.select = select;
        this.name = name;
    }

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

    public void makeup() throws InterruptedException {
        if(select == 0){
            synchronized (mirror){
                System.out.println(this.name+  "   獲得了鏡子的鎖");
                Thread.sleep(2000);
                synchronized (lipstick){
                    System.out.println(this.name + "  獲得了口紅的鎖");
                }
            }
        }else{
            synchronized (lipstick){
                System.out.println(this.name + "  獲得了口紅的鎖");
                Thread.sleep(2000);
                synchronized (mirror){
                    System.out.println(this.name+  "   獲得了鏡子的鎖");
                }
            }
        }
    }