tickettype.java

< ProJavaProgrammingSecondEdition> 书中例程源码

public class TicketType {

    public static final TicketType TYPE_COACH = new TicketType();
    public static final TicketType TYPE_BUSINESS = new TicketType();
    public static final TicketType TYPE_FIRST_CLASS = new TicketType();

    private TicketType() {
    }

}