please what is wrong

public class Solution {
    public static void main(String[] args) {
        Drink beer = new AlcoholicBeer();
        System.out.println(beer.toString());
    }

    public interface Drink {
        boolean isAlcoholic();
    }

    public static class AlcoholicBeer implements Drink{
        @Override
        public String toString() {
            if (isAlcoholic()) {
                return "Alcoholic beverage";
            } else {
                return "Non-alcoholic beverage";
            }
            boolean isAlcoholi(){
                return "Alcoholic beverage";

            }

        }