统计字符串每个字符出现的次数

利用键盘录入，输入一个字符串,统计该字符串中各个字符的数量

如用户输入字符串:"helloworld java",程序输出结果：h(1)e(1)l(3)o(2) (2)w(1)r(1)d(1)j(1)a(2)v(1)

注：输出结果不要求顺序一致

package com.homework.demo01;

import java.util.*;

public class Demo03 {
    public static void main(String[] args) {
        HashMap<Character,Integer> map = new LinkedHashMap<>();
        Integer i = 1;
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入字符串:");
        String s = scanner.next();

        char[] chars = s.toCharArray();
        for (char c : chars) {
            if(map.get(c)==null){
                map.put(c,i);
            }else {
                i++;
                map.put(c,i);
            }
        }

        Set<Map.Entry<Character, Integer>> entries = map.entrySet();
        for (Map.Entry<Character, Integer> entry : entries) {
            System.out.print(entry.getKey()+"("+entry.getValue()+")");
        }
    }
}

``` java