java matrix example

Example 1: Symmetric matrix program in java

// symmetric matrix program in java
import java.util.Scanner;
public class SymmetricMatrixDemo
{
   public static void main(String[] args)
   {
      Scanner sc = new Scanner(System.in);
      System.out.println("Please enter number of rows - ");
      int row = sc.nextInt();
      System.out.println("Please enter number of columns - ");
      int col = sc.nextInt();
      int symMatrix[][] = new int[row][col];
      System.out.println("Please enter the elements - ");
      for(int x = 0; x < row; x++)
      {
         for(int y = 0; y < col; y++)
         {
            symMatrix[x][y] = sc.nextInt();
         }
      }
      System.out.println("Now printing the input matrix - ");
      for(int x = 0; x < row; x++)
      {
         for(int y = 0; y < col; y++)
         {
            System.out.print(symMatrix[x][y] + "\t");
         }
         System.out.println();
      }
      // check if a matrix is symmetric
      if(row != col)
      {
         System.out.println("It's not a square matrix!!");
      }
      else
      {
         boolean symmetricMatrix = true;
         for(int x = 0; x < row; x++)
         {
            for(int y = 0; y < col; y++)
            {
               if(symMatrix[x][y] != symMatrix[y][x])
               {
                  symmetricMatrix = false;
                  break;
               }
            }
         }
         if(symmetricMatrix)
         {
            System.out.println("It's a symmetric matrix!!");
         }
         else
         {
            System.out.println("It's not a symmetric matrix!!");
         }
      }
      sc.close();
   }
}

Example 2: declare matrix in java

int[][] multi = new int[5][];
multi[0] = new int[10];
multi[1] = new int[10];
multi[2] = new int[10];
multi[3] = new int[10];
multi[4] = new int[10];