AdvancedCalculator.java

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

 int sub(int a , int b)
 {
 return a - b;
 }
}

public class AdvancedCalculator extends Calculator {
 int mult(int a , int b)
 {
 return a * b;
 }

 int div(int a , int b)
 {
 return a / b;
 }

 public static void main(String args[])
 {
 AdvancedCalculator cal = new AdvancedCalculator();

 System.out.println( cal.add(1, 2) );
 System.out.println( cal.sub(1, 2) );
 System.out.println( cal.mult(1, 2) );
 System.out.println( cal.div(1, 2) );
 }
}