Jewels and Stones LeetCode solution in Java

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class Solution {
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  public int numJewelsInStones(String jewels, String stones) {
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    HashSet<Character> hs = new HashSet<>();
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    int count = 0;
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    for (int i = 0; i < jewels.length(); i++) {
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      hs.add(jewels.charAt(i));
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    }
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    for (int i = 0; i < stones.length(); i++) {
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      if (hs.contains(stones.charAt(i))) count++;
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    }
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    return count;
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  }
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}