Encrypt and Decrypt Strings LeetCode solution in Java

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class Encrypter {
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  Map<String, Integer> encryptedDictCount;
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  int[] keys;
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  Set<String> dictionary;
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  String[] val;
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  public Encrypter(char[] keys, String[] values, String[] dictionary) {
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    this.keys = new int[26];
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    encryptedDictCount = new HashMap<>();
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    this.val = values.clone();
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    this.dictionary = new HashSet<>(Arrays.asList(dictionary));
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    for (int i = 0; i < keys.length; i++) {
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      this.keys[keys[i] - 'a'] = i;
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    }
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    for (String dict : dictionary) {
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      String encrpted = encrypt(dict);
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      encryptedDictCount.put(encrpted, encryptedDictCount.getOrDefault(encrpted, 0) + 1);
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    }
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  }
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  public String encrypt(String word1) {
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    StringBuilder sb = new StringBuilder();
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    for (int i = 0; i < word1.length(); i++) {
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      int c = word1.charAt(i) - 'a';
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      sb.append(val[keys[c]]);
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    }
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    return sb.toString();
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  }
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  public int decrypt(String word2) {
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    return encryptedDictCount.getOrDefault(word2, 0);
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  }
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}