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
