Vending Machine

import java.util.Scanner;

public class VendingMashine {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        double sum = 0;
        String input = scan.nextLine();

        while (!input.equals("Start")) {
            double coins = Double.parseDouble(input);
            if (coins == 0.1 || coins == 0.2 || coins == 0.5 || coins == 1 || coins == 2) {
                sum += coins;

            } else {
                System.out.print(String.format("Cannot accept %.2f%n", coins));

            }
            input = scan.nextLine();
        }
        input = scan.nextLine();
        while (!input.equals("End")) {

            double productPrice = 0;


            switch (input) {
                case "Nuts":
                    productPrice = 2.0;
                    break;
                case "Water":
                    productPrice = 0.7;
                    break;
                case "Crisps":
                    productPrice = 1.5;
                    break;
                case "Soda":
                    productPrice = 0.8;
                    break;
                case "Coke":
                    productPrice = 1.0;
                    break;
                default:
                    System.out.println("Invalid product");
                    break;
            }

            boolean isTrue = input.equals("Nuts") || input.equals("Water")
                    || input.equals("Crisps") || input.equals("Soda") || input.equals("Coke");
            if (isTrue && sum >= productPrice) {
                sum -= productPrice;
                System.out.printf(("Purchased %s%n"), input);
            } else if (isTrue){
                System.out.println("Sorry, not enough money");
            }
            input = scan.nextLine();
        }
        if (sum >= 0) {
            System.out.printf("Change: %.2f", sum);
        }

    }
}