ReentrantLock 可重复锁

ReentrantLock 可重复锁 实现 Lock接口

（非）公平锁 ReentrantLock

公平锁：可以先来后到
非公平锁：可以插队

package JUC;

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

/**   
 * Copyright © 2021 eSunny Info. Tech Ltd. All rights reserved.		
 */
public class SaleTicketDemo02 {
    
    
	
	public static void main(String[] args) {
    
    
		//并发 多线程操作同一个资源类，把资源类丢入线程
		Ticket2 ticket = new Ticket2();
		
		//@FunctionalInterface 函数式接口
		new Thread(()-> {
    
    
			for (int i = 1; i < 60; i++) {
    
    
				ticket.sale();
			}
		},"A").start();
		new Thread(()-> {
    
    
			for (int i = 1; i < 60; i++) {
    
    
				ticket.sale();
			}
		},"B").start();
		new Thread(()-> {
    
    
			for (int i = 1; i < 60; i++) {
    
    
				ticket.sale();
			}
		},"C").start();
	}
}


//资源类 OOP
class Ticket2{
    
    
	//属性 方法
	private int number = 50;
	
	//可重复锁 （true公平锁 默认非公平锁）
	Lock lock = new ReentrantLock(true);
	
	//买票的方式 synchronized本质就是队列，锁
	public void sale() {
    
    
		lock.lock();
		
		//尝试获取锁
		lock.tryLock();
		try {
    
    
			if(number>0) {
    
    
				System.out.println(Thread.currentThread().getName() +" : " + (number--));
			}
		} catch (Exception e) {
    
    
			e.printStackTrace();
		}finally {
    
    
			lock.unlock();
		}
	}
}