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Program to create a two dimensional array fill it with given few characters in Java

Here, we are implementing a java program that will read number of rows and cols from the user and create a two dimensional array, then it will read few characters and fill all elements with these characters. By IncludeHelp Last updated : December 23, 2023

Problem statement

Given number of rows, cols and the characters we have to create a two dimensional array and fill all elements with the given characters using java program.

Example

Input
Enter size of the Array : 5 (rows are cols are same here)
Enter first character : @
Enter second character : *
Enter third character : #

Output
# @ @ @ # 
* # @ # * 
* * # * * 
* # @ # * 
# @ @ @ #

Program to create a two dimensional array fill it with given few characters in Java

import java.util.Scanner;

public class ExArrayFillWithDIffCharacters {
  public static void main(String args[]) {
    // create scanner class object.
    Scanner Sc = new Scanner(System.in);

    // enter the size here.
    System.out.print("Enter size of the Array : ");
    int n = Sc.nextInt();
    // enter size in given range.
    if (n < 2 || n > 10)
      System.out.print("Size out of Range");
    else {
      // declare array object.
      char A[][] = new char[n][n];

      // enter different characters for filling the array
      System.out.print("Enter first character : ");
      char c1 = Sc.next().charAt(0);

      System.out.print("Enter second character : ");
      char c2 = Sc.next().charAt(0);

      System.out.print("Enter third character : ");
      char c3 = Sc.next().charAt(0);

      for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
          // Filling the diagonals with third character
          if (i == j || (i + j) == (n - 1))
            A[i][j] = c3;
          else // Filling all other positions with second character
            A[i][j] = c2;
        }
      }

      for (int i = 0; i < n / 2; i++) {
        for (int j = i + 1; j < n - 1 - i; j++) {
          // Filling the upper positions.
          A[i][j] = c1;

          // Filling the lower positions.
          A[n - 1 - i][j] = c1;
        }
      }

      // Printing the Matrix
      System.out.println("\nOutput : \n");
      for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
          System.out.print(A[i][j] + " ");
        }
        System.out.println();
      }
    }
  }
}

Output

Enter size of the Array : 5
Enter first character : @
Enter second character : *
Enter third character : #

Output : 

# @ @ @ # 
* # @ # * 
* * # * * 
* # @ # * 
# @ @ @ #