Check if All Characters Have Equal Number of Occurrences

Given a string s, return true if s is a good string, or false otherwise.

A string s is good if all the characters that appear in s have the same number of occurrences (i.e., the same frequency).

LeetCode Problem - 1941

class Solution {
    public boolean areOccurrencesEqual(String s) {
        // Initialize a map to store the frequency of each character
        Map<Character, Integer> map = new HashMap<>();

        // Iterate over each character in the string
        for(char c : s.toCharArray()) {
            // Update the frequency of each character in the map
            map.put(c, map.getOrDefault(c, 0) + 1);
        }

        // Get the frequency of the first character as a reference
        int flag = map.get(s.charAt(0));

        // Iterate over the frequencies of all characters in the map
        for(int e : map.values()) {
            // If any character's frequency does not match the reference, return false
            if(flag != e) return false;
        }

        // If all characters have the same frequency, return true
        return true;
    }
}