(Java代码)返回输入字符串中出现的最大字符数

import java.util.HashMap;
import java.util.Map;

public class MaxCharacterCount {
    public static void main(String[] args) {
        String input = "Hello World!";
        int maxCount = getMaxCharacterCount(input);
        System.out.println("The maximum character count is: " + maxCount);
    }

    public static int getMaxCharacterCount(String input) {
        Map<Character, Integer> charCountMap = new HashMap<>();

        for (int i = 0; i < input.length(); i++) {
            char c = input.charAt(i);
            charCountMap.put(c, charCountMap.getOrDefault(c, 0) + 1);
        }

        int maxCount = 0;
        for (int count : charCountMap.values()) {
            if (count > maxCount) {
                maxCount = count;
            }
        }

        return maxCount;
    }
}