统计英文字符串中字符出现的次数(更新中)

package 小工具;

import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

/**
 * @author 无法手执玫瑰
 * 2020/11/0030 17:16
 */
public class 统计各字符出现的次数 {
    static void fun1(String s){
        char[] chars = s.toCharArray();
        //26个字母
        int[] alphabetCount = new int[26];
        for (char aChar : chars) {
            alphabetCount[aChar - 'a']++;
        }
        String s1 = Arrays.toString(alphabetCount);
        System.out.println(s1);
    }

    static void  fun2(String s){
        char[] chars = s.toCharArray();
        Map<Character, Integer> map = new HashMap<>();
        for (char aChar : chars) {
            map.put(aChar,map.getOrDefault(aChar,0) + 1);
        }
        /*Set<Map.Entry<Character, Integer>> entries = map.entrySet();
        entries.forEach(System.out::println);*/
        for (Map.Entry<Character, Integer> entry: map.entrySet()){
            System.out.println(entry.getKey() + "   " + entry.getValue());
        }
    }
    public static void main(String[] args) {
        String s = "aabbdcgs";
        fun2(s);
    }
}