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hashmap的小应用---投票去旅游

发布时间 2023-11-07 19:49:41作者: 0927#$

在学习了map之后,使用简单的hashmap进行简单的全班同学投票旅游地点

package com.itheima.myMap;

import java.util.*;
import java.util.function.BiConsumer;

public class Text2 {
    public static void main(String[] args) {


        //模拟投票
        Random ra = new Random();
        String[] arr = {"A", "B", "C", "D"};
        ArrayList<String> list = new ArrayList<>();
        for (int i = 0; i < 80; i++) {
            list.add(arr[ra.nextInt(arr.length)]);

        }
        //System.out.println(list);
        //对ABCD进行投票
        HashMap<String, Integer> hm = new HashMap<>();
        for (String s : list) {
            if (hm.containsKey(s)) {
                Integer i = hm.get(s);
                i++;
                hm.put(s, i);
            } else {
                hm.put(s, 1);
            }
        }
        //hm.forEach((str,i)-> System.out.println(str+"="+i));
        System.out.println(hm);


        //找最大值
        int max = 0;
        Set<Map.Entry<String, Integer>> entries = hm.entrySet();
        for (Map.Entry<String, Integer> entry : entries) {
            Integer count = entry.getValue();
            if (max < count) {
                max = count;
            }
        }
        System.out.println(max);

        //对数量为最大值的进行打印

        for (Map.Entry<String, Integer> entry : entries) {
            Integer count = entry.getValue();
            if (max == count) {
                System.out.println(entry.getKey());
            }
        }


    }


}