Frequency of Characters in Java

1import java.util.LinkedHashMap;
2import java.util.Map;
3import java.util.Scanner;
4
5public class Main {
6    public static void main(String[] args) {
7        Scanner sc = new Scanner(System.in);
8        System.out.print("Enter a string: ");
9        String s = sc.nextLine();
10
11        Map<Character, Integer> freq = new LinkedHashMap<>();
12        for (char c : s.toCharArray()) {
13            freq.put(c, freq.getOrDefault(c, 0) + 1);
14        }
15
16        for (Map.Entry<Character, Integer> e : freq.entrySet()) {
17            System.out.println(e.getKey() + " -> " + e.getValue());
18        }
19        sc.close();
20    }
21}