Example: ArrayEqualityManualCheck in Java

// ArrayEqualityManualCheck
import java.util.Scanner; // Not strictly needed for this example, but common import

public class Main {
    public static boolean areArraysEqualManually(int[] arr1, int[] arr2) {
        // Step 1: Check if arrays are null.
        // If both are null, they are considered equal.
        // If one is null and the other isn't, they are unequal.
        if (arr1 == null && arr2 == null) {
            return true;
        }
        if (arr1 == null || arr2 == null) {
            return false;
        }

        // Step 2: Check if arrays have the same length
        if (arr1.length != arr2.length) {
            return false; // Lengths are different, so arrays are not equal
        }

        // Step 3: Iterate through elements and compare
        for (int i = 0; i < arr1.length; i++) {
            if (arr1[i] != arr2[i]) {
                return false; // Found a differing element, so arrays are not equal
            }
        }

        // Step 4: If loop completes, all elements were equal
        return true;
    }

    public static void main(String[] args) {
        int[] array1 = {10, 20, 30, 40};
        int[] array2 = {10, 20, 30, 40};
        int[] array3 = {10, 20, 50, 40};
        int[] array4 = {10, 20, 30};
        int[] array5 = null;
        int[] array6 = null;

        System.out.println("array1 and array2 are equal: " + areArraysEqualManually(array1, array2));
        System.out.println("array1 and array3 are equal: " + areArraysEqualManually(array1, array3));
        System.out.println("array1 and array4 are equal: " + areArraysEqualManually(array1, array4));
        System.out.println("array5 and array6 are equal: " + areArraysEqualManually(array5, array6));
        System.out.println("array1 and array5 are equal: " + areArraysEqualManually(array1, array5));

        // Example with String arrays (requires .equals() for elements)
        String[] sArray1 = {"apple", "banana"};
        String[] sArray2 = {"apple", "banana"};
        String[] sArray3 = {"apple", "null"}; // Note: "null" as a string
        String[] sArray4 = {"orange", "banana"};

        System.out.println("\n--- String Array Examples ---");
        System.out.println("sArray1 and sArray2 are equal: " + areStringArraysEqualManually(sArray1, sArray2));
        System.out.println("sArray1 and sArray4 are equal: " + areStringArraysEqualManually(sArray1, sArray4));
    }

    // Helper for String arrays, showing use of .equals()
    public static boolean areStringArraysEqualManually(String[] arr1, String[] arr2) {
        if (arr1 == null && arr2 == null) {
            return true;
        }
        if (arr1 == null || arr2 == null) {
            return false;
        }
        if (arr1.length != arr2.length) {
            return false;
        }
        for (int i = 0; i < arr1.length; i++) {
            // Use Objects.equals to handle potential null elements gracefully
            if (!java.util.Objects.equals(arr1[i], arr2[i])) {
                return false;
            }
        }
        return true;
    }
}