package com.java.demo;

import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

public class Demo2 {

    /**
     * 同步代码块 和 同步方法 都属于隐式锁
     * 线程同步:Lock
     * @param args
     */
    public static void main(String[] args) {
        //线程不安全
        //解决方案3：显示锁 Lock 子类 ReentrantLock
        Runnable run = new Ticket();
        new Thread(run).start();
        new Thread(run).start();
        new Thread(run).start();
    }

    static class Ticket implements Runnable {
        //票数
        private int count = 10;
        //显示锁 l
        private Lock l = new ReentrantLock();
        @Override
        public void run() {
            while (true) {
                l.lock();
                if (count > 0) {
                    //卖票
                    System.out.println("正在准备卖票");
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    count--;
                    System.out.println(Thread.currentThread().getName() + "出票成功，余票：" + count);
                }else{
                    break;
                }
                l.unlock();
            }
        }
    }
}