java多线程模拟抢红包功能

今天有朋友问我一道面试题，有5个人抢5个红包，可重复抢，用多线程程序实现，实现方式有多种，分享一下我的思路：应用了阻塞队列的特性。

/**
 * Created by zhanglinqiang on 2016/6/23.
 */
public class MyTest { 

  public static void main(String[] args) throws InterruptedException {
    LinkedBlockingQueue<LuckyMoney> luckyMoneys = new LinkedBlockingQueue<>();
    List<FutureTask> futureTasks = new ArrayList<>();
    //准备抢红包
    for (int i = 0; i < 5; i++) {
      FutureTask<Object> futureTask = new FutureTask<>(new CatchLuckMoney(luckyMoneys, "name" + i), null);
      new Thread(futureTask,"name"+i).start();
      futureTasks.add(futureTask);
    }
    Thread.sleep(5);//确保抢红包线程准备就绪
    Random random = new Random(100);
    //发5个红包
    for (int i = 0; i < 5; i++) {
      luckyMoneys.put(new LuckyMoney("红包"+i, random.nextInt(100)+1));
    }
    //等到红包抢完
    while (!luckyMoneys.isEmpty()){
      Thread.sleep(1);
    }
    //终止抢红包线程
    for (FutureTask futureTask : futureTasks) {
      futureTask.cancel(true);
    } 

  }
} 

class CatchLuckMoney implements Runnable { 

  public CatchLuckMoney(LinkedBlockingQueue<LuckyMoney> luckyMoneys, String name) {
    this.luckyMoneys = luckyMoneys;
    this.name = name;
  } 

  private LinkedBlockingQueue<LuckyMoney> luckyMoneys;
  private String name; 

  @Override
  public void run() {
    while (!Thread.currentThread().isInterrupted()) {
      LuckyMoney redPackage = null;
      try {
        redPackage = luckyMoneys.take();
      } catch (InterruptedException e) {
//        e.printStackTrace();
        break;
      }
      System.out.println(name + "抢到了-->" + redPackage);
      luckyMoneys.remove(redPackage);
    }
    System.out.println("end>>>>>>>>>>>>>>>>>>>>>>>>>>>>"+Thread.currentThread().getName());
  }
} 

class LuckyMoney { 

  public LuckyMoney(String name, Integer money) {
    this.name = name;
    this.money = money;
  } 

  private String name;
  private Integer money; 

  @Override
  public String toString() {
    return "LuckyMoney{" +
        "name='" + name + '\'' +
        ", money=" + money +
        '}';
  }
} 

运行效果:

Connected to the target VM, address: '127.0.0.1:8869', transport: 'socket'
name3抢到了-->LuckyMoney{name='红包0', money=16}
name4抢到了-->LuckyMoney{name='红包3', money=89}
name0抢到了-->LuckyMoney{name='红包2', money=75}
name1抢到了-->LuckyMoney{name='红包1', money=51}
name3抢到了-->LuckyMoney{name='红包4', money=92}
end>>>>>>>>>>>>>>>>>>>>>>>>>>>>name0
end>>>>>>>>>>>>>>>>>>>>>>>>>>>>name4
end>>>>>>>>>>>>>>>>>>>>>>>>>>>>name3
Disconnected from the target VM, address: '127.0.0.1:8869', transport: 'socket'
end>>>>>>>>>>>>>>>>>>>>>>>>>>>>name1
end>>>>>>>>>>>>>>>>>>>>>>>>>>>>name2 

Process finished with exit code 0 

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