JAVA The two-dimensional arrays ml and m2 are identical if they have the same co

Question

JAVA

The two-dimensional arrays ml and m2 are identical if they have the same contents. Write a method that returns true if ml and m2 are identical, using the following header: public static boolean equals(int[] [] ml, int[][] m2) Write a test program that prompts the user to enter two lists of integers and displays whether the two are identical. Here are the sample runs. Enter listl: 51 25 22 6 1 4 24 54 6 Enter list2: 51 22 25 6 1 4 24 54 6 The two arrays are identical Enter listl: 51 5 22 6 1 4 24 54 6 Enter list2: 51 22 25 6 1 4 24 54 6 The two arrays are not identical

Explanation / Answer

import java.util.Scanner;

/**
* @author
*
*/
public class IdenticalArrays {

   /**
   * @param args
   */
   public static void main(String[] args) {
       // Prompt the user to enter two 3 x 3 arrays
       System.out.print("Enter list1: ");
       int[][] list1 = getArray();
       System.out.print("Enter list2: ");
       int[][] list2 = getArray();

       // Displays whether the two lists are identical
       System.out.println("The two arrays are"
               + (equals(list1, list2) ? " " : " not ") + "identical");
   }

   /**
   * getArray initializes a 3 x 3 array with user input
   *
   * @return
   */
   public static int[][] getArray() {
       Scanner input = new Scanner(System.in);
       final int ROWS = 3;
       final int COLUMNS = 3;
       int[][] m = new int[ROWS][COLUMNS];
       for (int i = 0; i < m.length; i++) {
           for (int j = 0; j < m[i].length; j++) {
               m[i][j] = input.nextInt();
           }
       }
       return m;
   }

   /**
   * equals returns true if m1 and m2 are identical
   *
   * @param m1
   * @param m2
   * @return
   */
   public static boolean equals(int[][] m1, int[][] m2) {
       int[] list1 = sort(m1);
       int[] list2 = sort(m2);
       for (int i = 0; i < list1.length; i++) {
           if (list1[i] != list2[i])
               return false;
       }
       return true;
   }

   /**
   * matrixToArray returns an array initialized with a matrix elements
   *
   * @param m
   * @return
   */
   public static int[] matrixToArray(int[][] m) {
       int[] list = new int[m.length * m[0].length];
       int k = 0;
       for (int i = 0; i < m.length; i++) {
           for (int j = 0; j < m[i].length; j++) {
               list[k] = m[i][j];
               k++;
           }
       }
       return list;
   }

   /**
   * sort sorts each column in a 3 x 3 array in accending order
   *
   * @param m
   * @return
   */
   public static int[] sort(int[][] m) {
       int[] list = matrixToArray(m);
       for (int i = 0; i < 3; i++) {
           // Find the min in the column 1
           int min = list[i];
           int minIndex = i;

           for (int j = i + 1; j < 3; j++) {
               if (min > list[j]) {
                   min = list[j];
                   minIndex = j;
               }
           }

           // Swap
           if (minIndex != i) {
               list[minIndex] = list[i];
               list[i] = min;
           }
       }
       return list;
   }
}

OUTPUT:

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 identical

Enter list1: 51 5 25 6 1 4 24 54 6
Enter list2: 51 22 25 6 1 4 24 54 6
The two arrays are not identical

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