Question

The 2 -dimensional arrays m1 and m2 are strictly identical if their corresponding elements are equal.  

Write the method "equals" which returns True if the arrays are strictly identical and False if they are not.

The method's header is: public static boolean equals(int[][] m1, int[][] m2)

Here is the program:

import java.util.Scanner;

public class StrictlyEquals {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);

final int ROW_SIZE = 3;
final int COLUMN_SIZE = 3;
System.out.print("Enter m1 (a 3 by 3 matrix) row by row: ");
int[][] m1 = new int[ROW_SIZE][COLUMN_SIZE];
    for (int i = 0; i < m1.length; i++)
       for (int j = 0; j < m1[0].length; j++)
          m1[i][j] = input.nextInt();

System.out.print("Enter m2 (a 3 by 3 matrix) row by row: ");
int[][] m2 = new int[ROW_SIZE][COLUMN_SIZE];
for (int i = 0; i < m2.length; i++)
    for (int j = 0; j < m2[0].length; j++)
       m2[i][j] = input.nextInt();

if (equals(m1, m2))
    System.out.println("The two arrays are strictly identical");
else
    System.out.println("The two arrays are not strictly identical");
}

public static boolean equals(int[][] m1, int[][] m2) {
/* YOUR CODE GOES HERE*/
}

}

Answer 1

import java.util.Scanner;

public class StrictlyEquals {
        public static void main(String[] args) {
                Scanner input = new Scanner(System.in);

                final int ROW_SIZE = 3;
                final int COLUMN_SIZE = 3;
                System.out.print("Enter m1 (a 3 by 3 matrix) row by row: ");
                int[][] m1 = new int[ROW_SIZE][COLUMN_SIZE];
                for (int i = 0; i < m1.length; i++)
                        for (int j = 0; j < m1[0].length; j++)
                                m1[i][j] = input.nextInt();

                System.out.print("Enter m2 (a 3 by 3 matrix) row by row: ");
                int[][] m2 = new int[ROW_SIZE][COLUMN_SIZE];
                for (int i = 0; i < m2.length; i++)
                        for (int j = 0; j < m2[0].length; j++)
                                m2[i][j] = input.nextInt();

                if (equals(m1, m2))
                        System.out.println("The two arrays are strictly identical");
                else
                        System.out.println("The two arrays are not strictly identical");
        }

        public static boolean equals(int[][] m1, int[][] m2) {
                if(m1.length!=m2.length)
                        return false;
                for(int i=0;i<m1.length;i++) {
                        if(m1[i].length!=m2[i].length)
                                return false;
                        for(int j=0;j<m1[i].length;j++)
                                if(m1[i][j]!=m2[i][j])
                                        return false;
                }
                return true;
        }

}

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