Question

Given two arrays of ints, a and b, write a java method that returns true if they have the same first element or they have the same last element. This method should return false if either array is empty or null.

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Answer 1

public static boolean sameFirstOrLast(int[] arr1, int[] arr2) {
    if (arr1 == null || arr1.length == 0 || arr2 == null || arr2.length == 0) {
        return false;
    }
    return arr1[0] == arr2[0] || arr1[arr1.length - 1] == arr2[arr2.length - 1];
}

public class SameFirstOrLast {

    public static boolean sameFirstOrLast(int[] arr1, int[] arr2) {
        if (arr1 == null || arr1.length == 0 || arr2 == null || arr2.length == 0) {
            return false;
        }
        return arr1[0] == arr2[0] || arr1[arr1.length - 1] == arr2[arr2.length - 1];
    }

    public static void main(String[] args) {
        System.out.println(sameFirstOrLast(new int[]{3, 9, 1}, new int[]{3, 0, 1, 6}));
        System.out.println(sameFirstOrLast(new int[]{9}, new int[]{4, 5, 9}));
        System.out.println(sameFirstOrLast(new int[]{3, 9, 1}, null));
        System.out.println(sameFirstOrLast(null, new int[]{3, 0, 1, 6}));
        System.out.println(sameFirstOrLast(new int[] {}, new int[]{3, 0, 1, 6}));
    }
}