Java: This method must return a result type of type double

Question

i've been stuck on this code for about an hour and i just can't find a sollution for this. If anyone can help me i'd be really thankful. Thanks in advance.

public double  berekenPrijs(int aantalBallen) {
    if (aantalBallen == 0) {
        return  0.80;
    }
    else if(aantalBallen == 1 ){
        return 0.80;
    }
    else if (aantalBallen <= 3 && aantalBallen >=2) {
        return 0.9 * aantalBallen * 0.80;

Answer 1

Try the following:

public class Goovy123 {
    public static void main(String[] args) throws InterruptedException {
        System.out.println(berekenPrijs(0));
        System.out.println(berekenPrijs(1));
        System.out.println(berekenPrijs(2));
        System.out.println(berekenPrijs(3));
    }

    static public double berekenPrijs(int aantalBallen) {
        if (aantalBallen == 0) {
            return 0;
        } else if (aantalBallen == 1) {
            return 0.80;
        } else if (aantalBallen <= 3 && aantalBallen >= 2) {
            return 0.9 * aantalBallen * 0.80;
        }
        return Double.NaN;
    }
}

Sample run:

0.0
0.8
1.4400000000000002
2.16