一：引言

这里是加了个同步块，来保证数据的准确性，用了个容器使，我们可以选位置

二：上码（这里是模拟在电影院选位置）

package com.wyj.three;import java.util.ArrayList;
import java.util.List;public class Demo6_快乐影院2 {public static void main(String[] args) {// TODO Auto-generated method stub//电影院中可用的位置List<Integer> ticts = new ArrayList<>();ticts.add(1);ticts.add(2);ticts.add(3);ticts.add(4);ticts.add(5);ticts.add(6);//顾客需要的位置List<Integer> seats1 = new ArrayList<>();seats1.add(1);seats1.add(2);List<Integer> seats2 = new ArrayList<>();seats2.add(7);Cinema2 cinema = new Cinema2(ticts,"快乐影院！");new Thread(new Customer2(seats1, cinema),"大王").start();new Thread(new Customer2(seats2,cinema),"小王").start();}
}class Cinema2{private List<Integer> ticts;//票数private String name;//电影院名称public Cinema2(List<Integer> ticts, String name) {super();this.ticts = ticts;this.name = name;}//购票public boolean Moreticket(List<Integer> seats) {System.out.println("可用位置为："+this.ticts);List<Integer> copy = new ArrayList<Integer>();//赋值，将ticte容器的内容复制到copy容器当中copy.addAll(ticts);//相减 这样可以减去copy容器包含seats容器中相同的元素copy.removeAll(seats);//这里表示 seats容器当中的元素，copy容器都包含if(ticts.size() - copy.size() != seats.size()) {return false;}ticts = copy;return true;}	
}
//顾客  自己选位置
class Customer2 implements Runnable{private List<Integer> seats;private Cinema2 ca;public Customer2(List<Integer> seats, Cinema2 ca) {super();this.seats = seats;this.ca = ca;}@Overridepublic void run() {// TODO Auto-generated method stubsynchronized (ca) {boolean flag = ca.Moreticket(seats);if(flag) {System.out.println("出票成功："+Thread.currentThread().getName()+"的位置-->"+this.seats);}else {System.out.println("出票失败"+Thread.currentThread().getName());}}}}

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