Is it possible to solve this problem with bit manipulation?

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    public boolean isAnagram(String s, String t) {
        if(s.length() != t.length())
            return false;
        int res = 0;
        for(int i=0; i < s.length(); i++ )
            res = res ^ s.charAt(i) ^ t.charAt(i);
        return res == 0;

    It can't pass the case "aa", "bb". Any ideas?

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