BlueJ-SumOfInput/Sum.java

import java.util.Scanner;

public class Sum{
    public void sumOfNumbers(){
        int result = 1;
        int i = 2;
        
        StringBuilder fact = new StringBuilder("1");

        Scanner s = new Scanner(System.in);        
        int input = s.nextInt();

        if(input != 0){
            
            while(i <= input){
                fact.append(String.format(" + %d", i));
                result += i;
                i++;
            }

            System.out.println(String.format("\nHmmm... the answer to that is..\n" + fact.toString() + "\nWhich is " + result + "!", input));
            System.out.println("\nGot anything harder?\n\nIf not, you can enter '0' to close\n----------\n");
            sumOfNumbers();
        }
    }
}