ExtraElementInTwoArrays.java

import java.util.Arrays;

public class ExtraElementInTwoArrays {

    public static void getExtraElement(int [] arrA, int [] arrB){

        int extraElement = 0;

        for (int i = 0; i <arrA.length ; i++)
            extraElement ^= arrA[i];

        for (int i = 0; i <arrB.length ; i++)
            extraElement ^= arrB[i];

        System.out.println("Array A: " + Arrays.toString(arrA));
        System.out.println("Array B: " + Arrays.toString(arrB));
        System.out.println("Extra Element: " + extraElement);
    }

    public static void main(String[] args) {
        int [] arrA = {3, 4, 5, 2, 9, 6};
        int [] arrB = {4, 3, 2, 9, 5, 7, 6};
        getExtraElement(arrA, arrB);
    }
}