1941. Check if All Characters Have Equal Number of Occurrences 

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class Solution {
    public boolean areOccurrencesEqual(String s) {
        int[] countMap = new int[26];

        for (int i = 0; i < s.length(); i++) {
            countMap[s.charAt(i) - 'a']++;
        }

        int exceptedCount = countMap[s.charAt(0) - 'a'];
        for (int count : countMap) {
            if (count != 0 && count != exceptedCount) {
                return false;
            }
        }

        return true;
    }
}

References

1941. Check if All Characters Have Equal Number of Occurrences