Lab Session 02

import java.util.Scanner;
public class Substraction extends Calculator{

    @Override
    void sum()
    {
        System.out.println("This is Abstract Method");
    }

    public static void main(String[] args) {
        Calculator sub = new Substraction();
        Scanner in = new Scanner(System.in);
        boolean repeat = true;
        System.out.println("Enter Two Values: ");
        while(repeat){
        try{
            int a = in.nextInt();
            int b = in.nextInt();
            System.out.println("Result is: "+(a-b));
            repeat = false;
        }
        catch(Throwable t)
        {
            System.out.println("Invalid Number, Please use unfractional Number.");
            in.nextLine();
            repeat = true;
        }
        finally{
            System.out.println("This is finally Block");
            sub.sum();
        }
        }
    }
}

\\Calculator Class\\

abstract class Calculator{
          abstract void sum();
          public void info(){
              System.out.println("Non-abstract method");
          }
}

RAW Paste Data
import java.util.Scanner;
public class Substraction extends Calculator{

    @Override
    void sum()
    {
        System.out.println("This is Abstract Method");
    }

    public static void main(String[] args) {
        Calculator sub = new Substraction();
        Scanner in = new Scanner(System.in);
        boolean repeat = true;
        System.out.println("Enter Two Values: ");
        while(repeat){
        try{
            int a = in.nextInt();
            int b = in.nextInt();
            System.out.println("Result is: "+(a-b));
            repeat = false;
        }
        catch(Throwable t)
        {
            System.out.println("Invalid Number, Please use unfractional Number.");
            in.nextLine();
            repeat = true;
        }
        finally{
            System.out.println("This is finally Block");
            sub.sum();
        }
        }
    }
}

\\Calculator Class\\

abstract class Calculator{
          abstract void sum();
          public void info(){
              System.out.println("Non-abstract method");
          }
}