ticketmaker.java

来自「<设计模式-Java语言中的应用> 的源码」· Java 代码 · 共 13 行

public class TicketMaker {
    private int ticket = 1000;
    private static TicketMaker singleton = new TicketMaker();       
    private TicketMaker() {                                         
    }                                                               
    public static TicketMaker getInstance() {                       
        return singleton;                                           
    }                                                               
    public synchronized int getNextTicketNumber() {                 
        return ticket++;
    }
}