771. Jewels and Stones

class Solution {
    public int numJewelsInStones(String J, String S) {
		int count = 0;
		for (int i = 0; i < S.length(); i++)
			for (int j = 0; j < J.length(); j++)
				if (S.charAt(i) == J.charAt(j))
					count++;
		return count;
	}
}