如何使用Java实现指定概率的抽奖

package com.zyan.local.pojo.entity;
import lombok.Data;
import java.io.Serializable;
import java.math.BigDecimal;
/**
 * @author zyan
 * @since 2022/12/16 16:49 星期五
 */
@Data
public class Prize implements Serializable {
    public Prize(Integer id, String name, Integer weight) {
        this.id = id;
        this.name = name;
        this.weight = weight;
    }
    /**
     * id
     */
    private Integer id;
    /**
     * 名称
     */
    private String name;
    /**
     * 权重
     */
    private Integer weight;
}

public static Prize lottery(List<Prize> prizeList) {
    //按照权重从小到大排序奖品
    prizeList.sort(Comparator.comparingInt(Prize::getWeight));
    //计算节点 节点的数量比奖品的数量多一个，即0
    List<Integer> nodeList = new ArrayList<>();
    //第一个节点为0
    nodeList.add(0);
    for (Prize prize : prizeList) {
        //每一个节点等于前一个节点+当前奖品的权重
        nodeList.add(nodeList.get(nodeList.size() - 1) + prize.getWeight());
    }
    //生成 0-结束节点 的随机数
    int randomInt = RandomUtil.randomInt(0, nodeList.get(nodeList.size() - 1));
    //最终抽奖逻辑 此处需要从第二个节点开始遍历
    for (int i = 1; i < nodeList.size(); i++) {
        //本次节点
        Integer endNode = nodeList.get(i);
        //前一个节点
        Integer startNode = nodeList.get(i - 1);
        //若随机数大于等于前一个节点并且小于本节点，在prizeList中位于i-1位置的奖品为抽中奖品
        //Tip：比较大小时，左闭右开与左开右闭都可以，不影响整体概率
        if (randomInt >= startNode
                && randomInt < endNode) {
            return prizeList.get(i - 1);
        }
    }
    throw new RuntimeException("程序异常 生成的随机数不在任何奖品区间内");
}

public static void main(String[] args) {
    List<Prize> prizeList = new ArrayList<>();
    prizeList.add(new Prize(0, "奖品0", 2300));
    prizeList.add(new Prize(1, "奖品1", 200));
    prizeList.add(new Prize(2, "奖品2", 500));
    prizeList.add(new Prize(3, "奖品3", 800));
    prizeList.add(new Prize(4, "奖品4", 800));
    //进行一千次抽奖验证概率
    List<Prize> lotteryResult = new ArrayList<>();
    for (int i = 0; i <= 1000; i++) {
        lotteryResult.add(lottery(prizeList));
    }
    Map<String, List<Prize>> collect = lotteryResult.stream().collect(Collectors.groupingBy(Prize::getName));
    collect.forEach((k, v) -> System.out.println(k + " 被抽中 " + v.size() + " 次"));
}