CoffeeMachine2.java

package machine;
import java.util.Scanner;

class Cup{
    static final int WATER = 200;
    static final int MILK = 50;
    static final int BEANS = 15;

    public static int getPossibleCups(int currentWater, int currentMilk, int currentBeans){

        int cupsFromWater = currentWater / WATER;
        int cupsFromMilk = currentMilk / MILK;
        int cupsFromBeans = currentBeans / BEANS;
        int possibleCups = Math.min(cupsFromWater, Math.min(cupsFromMilk, cupsFromBeans));

        return possibleCups;
    }
}

public class CoffeeMachine2 {
    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        System.out.println("Write how many ml of water the coffee machine has:");
        int currentWater = sc.nextInt();
        System.out.println("Write how many ml of milk the coffee machine has:");
        int currentMilk = sc.nextInt();
        System.out.println("Write how many grams of coffee beans the coffee machine has:");
        int currentBeans = sc.nextInt();

        System.out.println("Write how many cups of coffee you will need:");
        int cups = sc.nextInt();

        //Cup cup = new Cup();
        int possibleCups = Cup.getPossibleCups(currentWater, currentMilk, currentBeans);

        if(possibleCups == cups){
            System.out.println("Yes, I can make that amount of coffee");
        }
        else if(possibleCups > cups){
            System.out.println("Yes, I can make that amount of coffee (and even " + (possibleCups-cups) + " more than that)");
        }
        else{
            System.out.println("No, I can make only " + possibleCups + " cup(s) of coffee");
        }

        sc.close();
    }
}