Java Inheritance II

import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

class Arithmetic{
 public int add(int a, int b) {
  return a+b;
 }
}
class Adder extends Arithmetic{
 
}
public class Solution {

 public static void main(String[] args) {
  Adder a = new Adder();
  System.out.println("My superclass is: "+a.getClass().getSuperclass().getName());
  System.out.print(a.add(10, 32)+ " "+ a.add(10, 3) + " " + a.add(10, 10)+"\n");

 }

}