java线程同步--同步方法

Posted 2020-11-25 行尸走肉

同步方法,仍然后有线程锁.

1 对于非静态方法,线程锁(同步监视器)是this

2 对于静态方法,线程锁是该类.

 

package com.LearnJava.Thread;
/*
    同步代码块
    synchronized(同步监视器){
        //需要同步的代码
    }
    同步监视器:俗称 锁,可以是任何实例化的类.但是需要共用同一个实例.
 */
class WindowSell implements Runnable{
    Object obj = new Object();
    private int ticket = 100;
    @Override
    public void run() {
        while (true) {
                if(!sellTicket()) break;
            }
        }
    private synchronized boolean sellTicket(){
            if (ticket > 0) {
                System.out.println(Thread.currentThread().getName() + "sell " + ticket--);
                return true;
            }else{
                return false;
            }
    }
}
public class ThreadTestTicket {
    public static void main(String[] args) {
        WindowSell win = new WindowSell();
        Thread t1 = new Thread(win);
        t1.setName("1号窗口");
        Thread t2 = new Thread(win);
        t2.setName("2号窗口");
        Thread t3 = new Thread(win);
        t3.setName("3号窗口");

        t1.start();
        t2.start();
        t3.start();
    }
}