JAVA-计算一个字符串中每个字符的出现的次数

import java.util.*;

public class StringCharNumberDemo {
    public static void main(String[] args) {
        //后台输入一个字符串
        Scanner scanner = new Scanner(System.in);
        String strings = scanner.next();
        //将字符串转化为字符数组
        char[] chars = strings.toCharArray();
        //创建一个hashMap来存放，字符及其数量<K,V>
        LinkedHashMap<Character,Integer> hashMap = new LinkedHashMap<>();
        for (char aChar : chars) {
            if (!hashMap.containsKey(aChar)) {
                hashMap.put(aChar, 1);
            } else {
                hashMap.put(aChar, hashMap.get(aChar) + 1);
            }
        }
        //遍历Map
        Set<Map.Entry<Character, Integer>> entries = hashMap.entrySet();
        for (Map.Entry<Character, Integer> next : entries) {
            System.out.println(next);
        }
    }
}