设计三个线程，实现动物园售票窗口进行卖票，每天总共最多只能出售100张票，售完后所有窗口都停止售票

package com.multith.java;

public class Ticket implements Runnable{

	private int num=100;
	@Override
	public void run() {
		
			while(true) {
				synchronized (this) {  //同步代码块
					if(num>0) {
						try {
							Thread.sleep(100);
						} catch (InterruptedException e) {
							// TODO Auto-generated catch block
							e.printStackTrace();
						}
						num--;
						System.out.println(Thread.currentThread().getName()+ 
								" 卖出一张票，还剩："+ num + "张");
					}else {
						System.out.println(Thread.currentThread().getName()+" 票已售完！");
						break;
					}
			}
			
		}
	}
	
	public static void main(String[] args) {
		Ticket tic = new Ticket();
		
		Thread t1 = new Thread(tic,"窗口A");
		Thread t2 = new Thread(tic,"窗口B");
		Thread t3 = new Thread(tic,"窗口C");
		
		t1.start();
		t2.start();
		t3.start();
		
	}

}