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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