Question

The two-dimensional arrays list1 and list2 are identical if they have the same contents. Write a method that returns true if they are identical and false if they are not. Use the following header: public static boolean equals(int [][] list1, int [][] list2)

Write a test program that prompts the user to enter two 3 x 3 arrays of integers and displays whether the two are identical.

Enter list1:

Enter list2:

The two arrays are identical or The two arrays are not identical

Answer 1

import java.util.Scanner;

public class IdenticalArrays {

    public static boolean equals(int [][] list1, int [][] list2) {
        if (list1.length == list2.length) {
            for (int i = 0; i < list1.length; i++) {
                if (list1[i].length == list2[i].length) {
                    for (int j = 0; j < list1[i].length; j++) {
                        if (list1[i][j] != list2[i][j]) {
                            return false;
                        }
                    }
                } else {
                    return false;
                }
            }
            return true;
        }
        return false;
    }

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int[][] m1 = new int[3][3], m2 = new int[3][3];
        System.out.println("Enter first matrix: ");
        for (int i = 0; i < 3; i++) {
            for (int j = 0; j < 3; j++) {
                m1[i][j] = in.nextInt();
            }
        }
        System.out.println("Enter second matrix: ");
        for (int i = 0; i < 3; i++) {
            for (int j = 0; j < 3; j++) {
                m2[i][j] = in.nextInt();
            }
        }
        if (equals(m1, m2)) {
            System.out.println("Arrays are equal");
        } else {
            System.out.println("Arrays are not equal");
        }
    }
}