Concert

package c;

import java.util.Comparator;

public interface Concert {

    String getBand();

    String getGenre();

    double getTicketPrice();

    int getTicketCount();

    void setTicketCount(int ticketCount);

    public static Comparator<Concert> comparator = new Comparator<Concert>() {
        public int compare(Concert c1, Concert c2) {
            double price1 = c1.getTicketPrice();
            double price2 = c2.getTicketPrice();
            return (int) (price1 - price2);
        }
    };
}