这行字符串中出现频率最高的字符

1. 给定一行字符串，求出这行字符串中出现频率最高的字符，字符串中含有标点符号，字符不区分大小写。如果出现频率相同时，输出先出现在字符串中的字符。

import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Scanner;
public class Frequency {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner sc = new Scanner(System.in);
        String input = sc.nextLine();
        String strs = input.replaceAll(" ","").toLowerCase();
        Map<Character, Integer> map = new HashMap<Character, Integer>();
        Character CharStr = null;
        Integer CountmaxLength = 0;
        for (Character temp : strs.toCharArray()) {
            if (map.containsKey(temp)) { 
                map.put(temp, map.get(temp) + 1);
            } else {
                map.put(temp, 1);
            }
        }
        for (Entry<Character, Integer> entry : map.entrySet()) {
            if (entry.getValue() > CountmaxLength) {
                CharStr = entry.getKey();
                CountmaxLength = entry.getValue();
            }    
        }
        
        System.out.println(Character.toUpperCase(CharStr)+CountmaxLength.toString());
    }

}