Java Program to Create a Matrix and Fill it With Palindrome Number

In Java, a matrix can be represented using a two-dimensional array. Matrices are used for storing and manipulating data that have a tabular structure. Matrices have several properties and operations associated with them, such as addition, subtraction, multiplication, transposition, and determinant calculation.

As per the problem statement we have to Create a Matrix and Fill it with Palindrome Number.

Let's start!

For instance

Suppose we have 4*5 matrix:

After performing the operation on matrix, the result will be:

Enter the number of rows: 4

Enter the number of columns: 5

Matrix with Palindrome Numbers:

1 2 3 4 5 
6 7 8 9 11 
22 33 44 55 66 
77 88 99 101 111

Algorithm

Step-1: Take the size of the matrix.

Step-2: Create a square matrix.

Step-3: Check for Palindrome number and insert it into the matrix.

Step-4: Print the result.

Multiple Approaches

We have provided the solution in different approaches.

• By Using Static Initialization of Matrix Elements

• By Using User Defined Method

Let's see the program along with its output one by one.

Approach-1: By Using Static Initialization of Array Elements

In this approach, matrix elements will be initialized in the program. Then as per the algorithm Create a Matrix and Fill it with Palindrome Number.

Example

import java.util.Scanner;
public class Main 
{
   // main method
   public static void main(String[] args) 
   {
      // taking the size of the matrix
      Scanner scanner = new Scanner(System.in);      
      System.out.print("Enter the number of rows: ");
      int rows = scanner.nextInt();      
      System.out.print("Enter the number of columns: ");
      int columns = scanner.nextInt();      
      // create a square matrix
      int[][] matrix = new int[rows][columns];      
      // Fill the matrix with palindrome numbers
      fillMatrixWithPalindromes(matrix);      
      // Print the matrix
      System.out.println("Matrix with Palindrome Numbers:");
      printMatrix(matrix);
   }   
   // Function to create a matrix and fill it with Palindrome numbers
   public static void fillMatrixWithPalindromes(int[][] matrix) {
      int num = 1;      
      for (int i = 0; i < matrix.length; i++) {
         for (int j = 0; j < matrix[0].length; j++) {
            // Find the next palindrome number
            while (!isPalindrome(num)) {
               num++;
            }            
            // Fill the matrix with the palindrome number
            matrix[i][j] = num;
            num++;
         }
      }
   }   
   // Function to check if a number is an Palindrome number or not
   public static boolean isPalindrome(int number) {
      String str = String.valueOf(number);
      int i = 0;
      int j = str.length() - 1;      
      while (i < j) {
         if (str.charAt(i) != str.charAt(j)) {
            return false;
         }
         i++;
         j--;
      }      
      return true;
   }   
   // Function to display the matrix
   public static void printMatrix(int[][] matrix) {
      for (int i = 0; i < matrix.length; i++) {
         for (int j = 0; j < matrix[0].length; j++) {
            System.out.print(matrix[i][j] + " ");
         }
         System.out.println();
      }
   }
}

Output

Enter the number of rows: 4
Enter the number of columns: 5
Matrix with Palindrome Numbers:
1 2 3 4 5 
6 7 8 9 11 
22 33 44 55 66 
77 88 99 101 111

Approach-2: By Using User Defined Method

In this approach, mattrix elements will be initialized in the program. Then call a user defined method by passing the matrix as parameter and inside method as per the algorithm Create a Matrix and Fill it with Palindrome Number.

Example

import java.util.Scanner;
public class Main 
{
   // main method
   public static void main(String[] args) 
   {
      // taking the size of the matrix
      Scanner scanner = new Scanner(System.in);      
      System.out.print("Enter the number of rows: ");
      int rows = scanner.nextInt();      
      System.out.print("Enter the number of columns: ");
      int columns = scanner.nextInt();      
      // calling user defined method
      func(rows, columns);   
      
   }  
   // user defined method
   public static void func(int rows, int columns)
   {
      // create a square matrix
      int[][] matrix = new int[rows][columns];
      // Fill the matrix with palindrome numbers
      fillMatrixWithPalindromes(matrix);
      
      // Print the matrix
      System.out.println("Matrix with Palindrome Numbers:");
      printMatrix(matrix);
   }
   // Function to create a matrix and fill it with Palindrome numbers
   public static void fillMatrixWithPalindromes(int[][] matrix) {
      int num = 1;
      
      for (int i = 0; i < matrix.length; i++) {
         for (int j = 0; j < matrix[0].length; j++) {
            // Find the next palindrome number
            while (!isPalindrome(num)) {
               num++;
            }
            
            // Fill the matrix with the palindrome number
            matrix[i][j] = num;
            num++;
         }
      }
   } 
   // Function to check if a number is an Palindrome number or not
   public static boolean isPalindrome(int number) {
      String str = String.valueOf(number);
      int i = 0;
      int j = str.length() - 1;
     
      while (i < j) {
         if (str.charAt(i) != str.charAt(j)) {
            return false;
         }
         i++;
         j--;
      }
      
      return true;
   } 
   // Function to display the matrix
   public static void printMatrix(int[][] matrix) {
      for (int i = 0; i < matrix.length; i++) {
         for (int j = 0; j < matrix[0].length; j++) {
            System.out.print(matrix[i][j] + " ");
         }
         System.out.println();
      }
   }
}

Output

Enter the number of rows: 5
Enter the number of columns: 5
Matrix with Palindrome Numbers:
1 2 3 4 5 
6 7 8 9 11 
22 33 44 55 66 
77 88 99 101 111 
121 131 141 151 161

In this article, we explored how to create a matrix and fill that with palindrome numbers by using Java programming language.