[E].[J].389.FindTheDifference

class Solution {
    public char findTheDifference(String s, String t) {
        char[] arr1 = s.toCharArray();
        char[] arr2 = t.toCharArray();
        Arrays.sort(arr1);
        Arrays.sort(arr2);
        for (int i = 0; i < Math.min(arr1.length, arr2.length); i++) {
            if (arr1[i] != arr2[i]) return arr2[i]; 
        }
        return arr2[arr2.length-1];
    }
}