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Monday, 29 August 2016

Chapter 8 Exercise 28, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

8.28(Strictly identical arrays) The two-dimensional arrays m1 and m2 are strictly identical if their corresponding elements are equal. Write a method that returns true if m1 and m2 are strictly identical, using the following header:
public static boolean equals(int[][] m1, int[][] m2)
Write a test program that prompts the user to enter two 3 * 3 arrays of
integers and displays whether the two are strictly identical. Here are the
sample runs.
Enter list1: 51 22 25 6 1 4 24 54 6
Enter list2: 51 22 25 6 1 4 24 54 6
The two arrays are strictly identical
Enter list1: 51 25 22 6 1 4 24 54 6
Enter list2: 51 22 25 6 1 4 24 54 6
The two arrays are not strictly identical


package Chapter_08;

import java.util.Scanner;

public class Exercise_28 {

    public static void main(String[] args) {

        int[][] m1 = new int[3][3];
        int[][] m2 = new int[3][3];

        Scanner input = new Scanner(System.in);
        System.out.print("Enter list1: ");
        for (int i = 0; i < m1.length; i++)
            for (int j = 0; j < m1[i].length; j++)
                m1[i][j] = input.nextInt();
        System.out.print("Enter list2: ");
        for (int i = 0; i < m2.length; i++)
            for (int j = 0; j < m2[i].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 || m1[0].length != m2[0].length) return false;

        for (int i = 0; i < m1.length; i++) {
            for (int j = 0; j < m1[i].length; j++) {

                if (m1[i][j] != m2[i][j]) return false;
            }
        }

        return true;
    }
}

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