Count Chars In A String

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

public class CountCharsInAString {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String sequence = scanner.nextLine();
        Map<Character, Integer> counts = new HashMap<>();
        String sequenceWithoutSpaces = sequence.replaceAll("\\s+", "");
        for (int i = 0; i < sequenceWithoutSpaces.length(); i++) {
            char currentChar = sequenceWithoutSpaces.charAt(i);
            if (!counts.containsKey(currentChar)) {
                counts.put(currentChar, 1);
            } else {
                int currentCount = counts.get(currentChar);
                counts.put(currentChar, currentCount + 1);
            }
        }
        for (Map.Entry<Character, Integer> entry : counts.entrySet()) {
            System.out.println(entry.getKey() + " -> " + entry.getValue());
        }

    }
}