public class MatrixTest {
   public static void main(String[] args) {
      Matrix A = new Matrix(new int[][] { {1, 2, 3}, 
                                          {4, 5, 6}, 
                                          {7, 8, 9} 
                                        });

      Matrix B = new Matrix(new int[][] { {11, 12, 13}, 
                                          {14, 15, 16}, 
                                          {17, 18, 19} 
                                        });

      System.out.println(A);
      System.out.println(B);

      Matrix S = A.add(B);

      System.out.println(S);
   }
}