Logics Statistic

package CharacterStatistic;

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

class Statistic {
    Map<Character, Integer> Calc(String input) {
        Map<Character, Integer> stat = new HashMap<>();

        for (int i = 0; i < input.length(); i++) {
            char symbol = input.charAt(i);
            int count = stat.get(symbol) != null ? stat.get(symbol) : 0;
            count++;
            stat.put(symbol, count);
        }

        return stat;
    }

    void WriteStatistic(Map<Character, Integer> stat) {
        for (Character character: stat.keySet()) {
            System.out.println(character + " = " + stat.get(character));
        }
    }
}