public static void main(String args[]) {
    Math m = new Math();

    System.out.println("5 + 9 = " + m.add(5, 9));

    System.out.println("8 - 2 = " + m.sub(8, 2));

    System.out.println("4 x 7 = " + m.multiply(4, 7));
  }