In Java 15,

import java.io.; import java.util.;

class Arithmetic {

int add(int a, int b) {
    return a+b;
}

}

class Adder extends Arithmetic {

}

public class Solution {

public static void main(String[] args) {
    Adder adder = new Adder();
    System.out.println("My superclass is: " + adder.getClass().getGenericSuperclass().getTypeName());

    System.out.println(adder.add(30,12) + " " + adder.add(10,3) + " " + adder.add(15,5));
}

}

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code for this program is

class Arithmetic { int add(int a,int b) { return a+b; } }

class Adder extends Arithmetic {

}

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In java 7:

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

//Write your code here 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){ // Create a new Adder object Adder a = new Adder();

    // Print the name of the superclass on a new line
    System.out.println("My superclass is: " + a.getClass().getSuperclass().getName());  

    // Print the result of 3 calls to Adder's `add(int,int)` method as 3 space-separated integers:
    System.out.print(a.add(10,32) + " " + a.add(10,3) + " " + a.add(10,10) + "\n");
 }

}