Matrix in Java

Program for matrix in java is as follows:


import java.io.*;

class matrix
{
  int mat[][],r,c;

  matrix()
  {
     mat = new int[10][10];
  }
  public void getMat() throws Exception
  {
   // mat = new int[10][10];
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    System.out.println("\nEnter the Dim of the matrix : ");    
    r = Integer.parseInt(br.readLine());
    c = Integer.parseInt(br.readLine());

    System.out.println("\nEnter the matrix elements : ");    
    for(int i = 0 ; i < r ; i++)
    {
      for(int j = 0 ; j < c ; j++)
      {
        mat[i][j] = Integer.parseInt(br.readLine());
      }
    }
  }

  public void addMat(matrix m1,matrix m2)
  {
     r = m1.r;
     c = m1.c;

     for(int i = 0 ; i < r ; i++)
    {
       for(int j = 0 ; j < c ; j++)
       {
          mat[i][j] = m1.mat[i][j] + m2.mat[i][j];
       }
    }
  }

  public void putMat()
  {
    System.out.println("\nMatrix is : \n");
    for(int i = 0 ; i < r ; i++)
    {
      for(int j = 0 ; j < c ; j++)
      {
        System.out.print(" " + mat[i][j]);
      }
      System.out.println("");
    }
  }

  public static void main(String args[]) throws Exception
  {
    matrix m1 = new matrix();
    matrix m2 = new matrix();
    matrix m3 = new matrix();

    m1.getMat();
    m2.getMat();

    m1.putMat();
    m2.putMat();

    m3.addMat(m1,m2);
    m3.putMat();
  } 
}