Controller.java

import java.util.ArrayList;
import java.util.Scanner;
import java.util.StringTokenizer;

public class Controller {
    public void startSystem() {
        System.out.printf("Welcome to Hungry Puppies, please insert a correct input...\n");
        Scanner in = new Scanner(System.in);
        String input = in.nextLine();
        while (!correctInput(input)) {
            System.out.printf("Incorrect input! Please try again...\n");
            input = in.nextLine();
        }
        StringTokenizer stringTokenizer = new StringTokenizer(input);
        ArrayList<Puppy> puppies = new ArrayList<Puppy>();
        while (stringTokenizer.hasMoreTokens()) {
            Puppy pup = new Puppy(Integer.parseInt(stringTokenizer.nextToken()));
            puppies.add(pup);
        }
        for (int i = 0; i < puppies.size(); i++) {
            if (i == 0) {
                puppies.get(i).setHappiness(puppies.get(i + 1).getBiscuitSize());
            } else if (i == puppies.size() - 1) {
                puppies.get(i).setHappiness(puppies.get(i - 1).getBiscuitSize());
            } else {
                puppies.get(i).setHappiness(puppies.get(i - 1).getBiscuitSize(), puppies.get(i + 1).getBiscuitSize());
            }
        }

        for (int i = 0; i < puppies.size(); i++) {
            System.out.printf("%s ", puppies.get(i).getMood());
        }



    }

    public boolean correctInput(String input) {
        for (int i = 0; i < input.length(); i++) {
            if (input.charAt(i) < 48 || input.charAt(i) > 57) {
                if (input.charAt(i) == ' ') {
                } else {
                    return false;
                }

            }
        }
        return true;
    }
}