Check if All Characters Have Equal Number of Occurrences LeetCode solution in Java

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class Solution {
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  public boolean areOccurrencesEqual(String s) {
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    int[] freq = new int[26];
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    for (int i = 0; i < s.length(); i++) freq[s.charAt(i) - 'a']++;
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    int val = freq[s.charAt(0) - 'a'];
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    for (int i = 0; i < 26; i++) if (freq[i] != 0 && freq[i] != val) return false;
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    return true;
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  }
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}