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,transport: 'socket' 
end>>>>>>>>>>>>>>>>>>>>>>>>>>>>name1 
end>>>>>>>>>>>>>>>>>>>>>>>>>>>>name2 
 
Process finished with exit code 0 

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持编程小技巧。

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