String Char Counts Using Collections

String Char Counts Using Collections: 

package InterViewQuestions;

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

public class StringCharCountsUsingCollections {
    //string = hemchandrraBhatt
    //print number chars repeated
    public static void main(String[] args) {
        String str = "hemchandrabhatt";
        HashMap<Character, Integer> mapCharCount = new HashMap<>();
        char[] charArr = str.toCharArray();
        for (char c : charArr) {
            if (mapCharCount.containsKey(c)) {
                mapCharCount.put(c, mapCharCount.get(c) + 1);
            } else {
                mapCharCount.put(c, 1);
            }
        }
        //System.out.println(mapCharCount);
        for (Map.Entry entry : mapCharCount.entrySet()) {
            System.out.println(entry.getKey() + " " + entry.getValue());
        }

        // Time complexity: O(n) where n is length of given string
        //Auxiliary Space: O(n)

    }
}