import java.util.Scanner;

public class J714

{

    /**

     * @taking input from user

     */

    public static void main(String[] args)

    {

        /**

         * @taking input from user

         */

        Scanner input = new Scanner(System.in);

        System.out.print("Enter the length of a square matrix: ");

        int n = input.nextInt();

        /**

         * @declaring the array of n*n size

         */

        int[][] board = new int[n][n];

        boolean isSameOnARow = false; boolean isSameOnAColumn = false;

        boolean isSameOnADiagonal = false; boolean isSameOnASubdiagonal = false;

        /**

         * @performing the fucntions

         */

        for (int i = 0; i < board.length; i++) {

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

                board[i][j] = (int)(Math.random() * 2.0D);

                System.out.print(board[i][j]);

            }

            System.out.println();

        }

        /**

         * @taking a for loop

         */

        for (int i = 0; i < board.length; i++) {

            boolean same = true;

            for (int j = 1; j < board[0].length; j++) {

                /**

                 * @checking the conditions

                 */

                if (board[i][0] != board[i][j]) {

                    same = false;

                    break;

                }

            }

            /**

             * @checking the conditions

             */

            if (same) {

                System.out.println("All " + board[i][0] + "'s on row " + i);

                isSameOnARow = true;

            }

        }

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

            boolean same = true;

            for (int i = 1; i < board.length; i++) {

                if (board[0][j] != board[i][j]) {

                    same = false;

                    break;

                }

            }

            if (same) {

                System.out.println("All " + board[0][j] + "'s on column " + j);

                isSameOnAColumn = true;

            }

        }

        boolean same = true;

        for (int i = 1; i < board.length; i++) {

            if (board[0][0] != board[i][i]) {

                same = false;

                break;

            }

        }

        if (same) {

            System.out.println("All " + board[0][0] + "'s on major diagonal");

            isSameOnADiagonal = true;

        }/**

         * @checking the conditions

         */

        same = true;

        for (int i = 1; i < board.length; i++) {

            if (board[0][(board.length - 1)] != board[i][(board.length - 1 - i)]) {

                same = false;

                break;

            }

        }

        /**

         * @checking the conditions and printing the required elements

         */

        if (same) {

            System.out.println("All " + board[0][(board.length - 1)] + "'s on sub-diagonal");

            isSameOnASubdiagonal = true;

        }

        if (!isSameOnARow) {

            System.out.println("No same numbers on a row");

        }

        if (!isSameOnAColumn) {

            System.out.println("No same numbers on a column");

        }

        if (!isSameOnADiagonal) {

            System.out.println("No same numbers on the major diagonal");

        }

        if (!isSameOnASubdiagonal)

            System.out.println("No same numbers on the sub-diagonal");

    }

}

import java.util.Scanner;

public class ExploringMatrix

{

  public static void main (String[] args)

  {

    Scanner scan = new Scanner(System.in);

    System.out.print("Enter the size for the matrix: ");

    int size = scan.nextInt();

    int[][] m = new int[size][size];

    for (int i =0;i<size;i++)

    {

      for (int j =0;j<size;j++)

      {

        m[i][j] = (int) (Math.random()*2);

        System.out.print(m[i][j]);

      }

      System.out.println();

    }

    boolean letitbe;

    //Row

    int j =0;

    boolean row=false, column=false, major =false, sub = false;

    for(int i=0; i<size;i++)

    {

      letitbe = true;

      for (j =0;j<size-1;j++)

      {

        if (m[i][j] != m[i][j+1]) letitbe = false;

      }

      if (letitbe)

      {

        System.out.println("All " + m[i][j] + "s on row " + i);

        row = true;

      }

    }

    //Column

    for(int i=0; i<size;i++)

    {

      letitbe = true;

      for (j =0;j<size-1;j++)

      {

        if (m[j][i] != m[j+1][i]) letitbe = false;

      }

      if (letitbe)

      {

        System.out.println("All " + m[j][i] + "s on column " + i);

        column = true;

      }

    }

    //Major diagonal, there is only one eh?

    letitbe = true;

    for (int  i=0;i<size-1;i++)

    {

      if (m[i][i]!= m[i+1][i+1]) letitbe = false;

    }

    if (letitbe)

    {

      System.out.println("All " + m[0][0] + "s on major diagonal");

      major = true;

    }

    letitbe = true;

    for (int  i=0;i<size-1;i++)

    {

      if (m[i][size-i-1]!= m[i+1][size-i-1-1]) letitbe = false;

    }

    if (letitbe)

    {

      System.out.println("All " + m[0][size-1] + "s on sub-diagonal");

      sub = true;

    }

    if ( column == false) System.out.println("No same numbers on a column");

    if ( row == false) System.out.println("No same numbers on a row");

    if ( major == false) System.out.println("No same numbers on the major diagonal");

    if ( sub == false) System.out.println("No same numbers on the sub-diagonal");

  }

}

Exploring Matricies in Java

Problem:

Write a program that prompts the user to enter the length of a square matrix, randomly fills in 0s and 1s into the matrix,
 prints the matrix, and finds the rows, columns, and diagonals with all 0s or 1s.

Output:

Enter the size for the matrix: 4

1000

0111

0101

0100

No same numbers on a column

No same numbers on a row

No same numbers on the major diagonal

No same numbers on the sub-diagonal