Java学习总结-线程实战-抢红包游戏

代码如下：

package grab.red.envelopes;

import java.util.List;

public class GetRedPacket extends Thread{
    private List<Integer> redEnvelopes;

    public GetRedPacket(List<Integer> redEnvelopes) {
        this.redEnvelopes = redEnvelopes;
    }

    @Override
    public void run(){
        String name = Thread.currentThread().getName();
        synchronized (redEnvelopes){
            if(redEnvelopes.size()==0){
                System.out.println(name+"没有红包了");
                return;
            }
            //随机取红包
            while(redEnvelopes.size()>0){
                int index = (int)(Math.random()*redEnvelopes.size());
                Integer redEnvelope = redEnvelopes.get(index);
                System.out.println(name+"抢到了"+redEnvelope+"元红包");
                redEnvelopes.remove(index);
                if(redEnvelopes.size()==0){
                    System.out.println(name+"抢完了最后的红包");
                    return;
                }
            }

        }
    }
}

package grab.red.envelopes;

import java.util.ArrayList;
import java.util.List;

public class ThreadTest {
    public static void main(String[] args) {
        //定义线程类，创建100个线程，竞争抢红包
        List<Integer> redEnvelopes = getRedEnvelopes();
        for (int i = 0; i < 100; i++) {
            GetRedPacket getRedPacket = new GetRedPacket(redEnvelopes);
            getRedPacket.start();
        }

    }
    //定义一个方法，准备两百个红包，放到List数组中返回
    public static List<Integer> getRedEnvelopes(){
        //一共两百个红包，160个红包随机金额在1-30之间，另外40个红包随机金额在31-100之间
        List<Integer> redEnvelopes = new ArrayList<>();
        for (int i = 0; i < 160; i++) {
            redEnvelopes.add((int)(Math.random()*30+1));
        }
        for (int i = 0; i < 40; i++) {
            redEnvelopes.add((int)(Math.random()*70+31));
        }
        return redEnvelopes;
    }


}