AV7 Finalisti

package AV7;

import java.util.ArrayList;
import java.util.List;
import java.util.Random;

public class FinalistTest {
    public static void main(String[] args) {
        FinalistPicker picker = new FinalistPicker(5);
        try {
            System.out.println(picker.pick(5));
        } catch (InvalidPickerArgumentsException e) {
            //e.getMessage();
            System.out.println(e.getMessage());
        }
    }

}

class InvalidPickerArgumentsException extends Exception {
    InvalidPickerArgumentsException(String msg) {
        super(msg);
    }

}

class FinalistPicker {
    int finalists;
    static Random RANDOM = new Random();

    public FinalistPicker(int finalists) {
        this.finalists = finalists;
    }

    public List<Integer> pick(int n) throws InvalidPickerArgumentsException {
        if (n > finalists) {
            throw new InvalidPickerArgumentsException("The number n cannot exceed the numer of finalists");
        }
        if (n <= 0) {
            throw new InvalidPickerArgumentsException("The number n has to be a positive number");
        }

        List<Integer> pickedFinalists = new ArrayList<>();

        while (pickedFinalists.size() != n) {
            int pick = RANDOM.nextInt(finalists) + 1;
            if (!pickedFinalists.contains(pick)) {
                pickedFinalists.add(pick);
            }
        }
        return pickedFinalists;
    }
}