大体思路
红包的分发见JAVA作业——红包分发。
而抢红包要解决的是线程问题。
其实比较简单，设定好人数，每个人一个线程，每个线程执行一遍，有红包就抢，没有红包就抢不到，所以run函数中只要判断现在还有没有红包就可以了。
代码实现
import java.util.Random;
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
int person_num, red_pocket_num, sum_money;
Scanner scanner = new Scanner(System.in);
System.out.println("请设置红包个数:");
red_pocket_num = scanner.nextInt();
System.out.println("请设置总金额数量(分):");
sum_money = scanner.nextInt();
if(sum_money < red_pocket_num) {
System.out.println("钱不够，退出程序。");
return;
}
System.out.println("请设置抢红包成员个数:");
person_num = scanner.nextInt();
myRunnable myrunnable = new myRunnable(sum_money,red_pocket_num);
Thread []person = new Thread[person_num];
for (int i = 0; i < person_num; i++) {
person[i] = new Thread(myrunnable);
person[i].setName("用户"+(i+1));
person[i].start();
}
}
}
class myRunnable implements Runnable{
private int []red_pocket;
private int num;
private int now_num;
public myRunnable(int money, int num) {
this.red_pocket = new Red_Pocket(money, num).get_red_packets();
this.num = num;
this.now_num = num;
}
@Override
public void run() {
if(this.num>0){
System.out.println(Thread.currentThread().getName()+"抢到了红包 "+(this.num-this.now_num+1)+" : "+red_pocket[--this.now_num]+"分");
}
else{
System.out.println(Thread.currentThread().getName()+"未抢到红包。");
}
}
}
class Red_Pocket{
private long seed;
private int money;
private int num;
public int[] get_red_packets() {
if(this.money < this.num) return new int[0];
Random random = new Random(this.seed);
this.seed = random.nextLong();
int[] res = new int[this.num];
double[] temp = new double[this.num];
double sum = 0;
int sum2 = 0;
for (int i = 0; i < this.num; i++) {
temp[i] = random.nextDouble();
sum += temp[i];
}
for (int i = 0; i < this.num; i++) {
res[i] = 1 + (int)(temp[i] / sum * (this.money - this.num));
sum2 += res[i];
}
res[random.nextInt(this.num)] += this.money - sum2;
return res;
}
private void init() {
this.seed = new Random(System.currentTimeMillis()).nextLong();
}
public Red_Pocket(int money,int num) {
init();
this.money = money;
this.num = num;
}
}
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