Please Help

package com.codegym.task.task13.task1303;

/*
Don't mix beer with cola

*/

public class Solution {
    public static void main(String[] args) throws Exception {
        print(new Beer());
        print(new Cola());
    }

    private static void print(Drink drink) {
        System.out.println(drink.getClass().getSimpleName());
    }

    public interface Drink {
        boolean isAlcoholic();
    }

    public static class Beer implements Drink{
        boolean isAlcoholic(){
            return true;
        }
    }

    public static class Cola implements Drink{
        boolean isAlcoholic(){
            return false;
    }
  }
}