JavaSE项目实践：红包雨-线程池/线程

一、需求

二、思路

创建红包集合，红包金额随机生成
继承线程类，重写构造器和run方法

三、代码

1.原始创建线程类

java 复制代码

public class GRPThread extends Thread {
    private final List<Integer> redPacket;
    private String name;
    public GRPThread(List<Integer> redPacket, String name) {
       super(name);
        this.redPacket = redPacket;
    }
    @Override
    public void run() {
        //100个人来抢集合中的钱
        String name = Thread.currentThread().getName();
        while (true) {
            synchronized (redPacket) {
                if (redPacket.isEmpty()) {break;}
                //随机一个索引取钱
                int index = (int) (Math.random() * redPacket.size());
                    int money = redPacket.remove(index);
                    System.out.println(name + "抢到钱了，金额为：" + money);
                if (!redPacket.isEmpty()) {
                    System.out.println("活动结束了！");
                    break;
                }
            }
        }
    }
}

java 复制代码

public class main {
    //100个员工竞争200个红包
    public static void main(String[] args) {
        List<Integer> redPacket = getRedPacket();
        for(int i=0;i<100;i++){
            new GRPThread(redPacket,"员工"+i).start();
        }
    }
    public static List<Integer> getRedPacket() {
        //小红包在【0~30】之间，总占比80%，大红包在【31~100】之间，总占比20%
        List<Integer> redPacket = new ArrayList<>();
        for (int i = 0; i < 200; i++) {
            if (i < 160) {
                redPacket.add((int) (Math.random() * 30));
            } else {
                redPacket.add((int) (Math.random() * 70) + 31);
            }
        }
        return redPacket;
    }
}

2.线程池分配

java 复制代码

@Data
public class GRPThread implements Runnable {
    private final List<Integer> redPacket;
    private String name;
    public GRPThread(List<Integer> redPacket, String name) {
        this.redPacket = redPacket;
        this.name = name;
    }
    @Override
    public void run() {
        //100个人来抢集合中的钱
       // String name = Thread.currentThread().getName();
        while (true) {
            synchronized (redPacket) {
                if (redPacket.isEmpty()) {break;}
                //随机一个索引取钱
                int index = (int) (Math.random() * redPacket.size());
                    int money = redPacket.remove(index);
                    System.out.println(name + "抢到钱了，金额为：" + money);
                    //抢太快了
                if (redPacket.isEmpty()) {
                    System.out.println("活动结束了！");
                    break;
                }
            }
            try {
                Thread.sleep(100);
            } catch (Exception e) {
                e.printStackTrace();//打印异常信息
            }
        }
    }
}

java 复制代码

public class main {
    //100个员工竞争200个红包
    public static void main(String[] args) {
        List<Integer> redPacket = getRedPacket();
        ThreadPoolExecutor TPE =new ThreadPoolExecutor(25, 50, 1000,
                TimeUnit.MILLISECONDS, new LinkedBlockingQueue<Runnable>(200),
                Executors.defaultThreadFactory(), new ThreadPoolExecutor.CallerRunsPolicy());
        for(int i=1;i<101;i++){
            TPE.execute(new GRPThread(redPacket,"员工"+i));
        }
    }
    public static List<Integer> getRedPacket() {
        //小红包在【0~30】之间，总占比80%，大红包在【31~100】之间，总占比20%
        List<Integer> redPacket = new ArrayList<>();
        for (int i = 0; i < 200; i++) {
            if (i < 160) {
                redPacket.add((int) (Math.random() * 30));
            } else {
                redPacket.add((int) (Math.random() * 70) + 31);
            }
        }
        return redPacket;
    }
}