/**

接口的实际应用:

题目: 两个人A,B开发一个火车票显示功能A负责客户端, B负责服务器端

思路:

1. 抽象出类:

1.1 客户端显示类(Terminal)

1.2 服务器端服务类(TrainService)

1.3 火车票(Ticket)

2. 找出类关系:

2.1 客户端 调用 服务器端 的获取火车票信息显示

TrainService -> Terminal(调用)

2.2 服务器端 提供 火车票信息 给 客户端

Ticket->TrainService(多对1) Ticket -> Terminal(多对多)

3. 找出类属性:

3.1 Ticket(车次,出发地,到达地,票价)

3.2 TrainService(火车站名称)

3.3 Terminal(代售点名称)

4. 找出类方法:

4.1 TrainService: 提供火车票信息 Ticket[] getTickets()

4.2 Terminal: 显示火车票信息 display()

*/

import java.util.Scanner;

public class ApplyInterface

{

public static void main(String[] args)

{

//北京西站火车票服务器打开

TrainService beijingWestService=new BeijingWestTrainService("北京西站");

//北京站火车票服务器打开

TrainService beijingService=new BeijingTrainService("北京站");

//我是北京朝阳区大黄庄的 代售点

Terminal t=new Terminal("北京朝阳区大黄庄的 代售点");

Scanner in =new Scanner(System.in);

System.out.println("请输入要查的火车站代码 1:北京西站 2:北京站");

int trainId=in.nextInt();

if(trainId==1)

{

t.setTrainService(beijingWestService);

}

if(trainId==2)

{

t.setTrainService(beijingService);

}

//打开火车电脑终端 查看火车票信息

t.display();

}

}

class Ticket

{

private String id;//车次

private String startCity;//出发城市

private String endCity;//到达城市

private float price;//票价

public Ticket(String id,String startCity,String endCity,float price)

{

this.id=id;

this.startCity=startCity;

this.endCity=endCity;

this.price=price;

}

public String getId()

{

return this.id;

}

public String getStartCity()

{

return this.startCity;

}

public String getEndCity()

{

return this.endCity;

}

public float getPrice()

{

return this.price;

}

}

interface TrainService

{

/**

A和B约定一个提供火车票的方法

*/

public Ticket[] getTickets();

/**

获取火车站名字

*/

public String getName();

}

class BeijingWestTrainService implements TrainService

{

private String name;

public BeijingWestTrainService(String name)

{

this.name=name;

}

public String getName()

{

return this.name;

}

/**

提供火车票的实现方法

*/

public Ticket[] getTickets()

{

Ticket[] tickets={

new Ticket("T1","北京","长沙",175f)

};

return tickets;

}

}

class BeijingTrainService implements TrainService

{

private String name;

public BeijingTrainService(String name)

{

this.name=name;

}

public String getName()

{

return this.name;

}

/**

提供火车票的实现方法

*/

public Ticket[] getTickets()

{

Ticket[] tickets={

new Ticket("T215","北京","吉林",130f)

};

return tickets;

}

}

class Terminal

{

private String proxy;//代售点名称

private Ticket[] tickets;// 火车票引用

private TrainService trainService;// 服务器接口引用

public Terminal(String proxy)

{

this.proxy=proxy;

}

public void setTrainService(TrainService trainService)

{

this.trainService=trainService;

}

/**

显示火车票的信息

思路:

1. 首先要从服务器端 获取 火车票信息

2. 循环把火车票信息显示在电脑终端上

*/

public void display()

{

//获取火车票信息

tickets=trainService.getTickets();

//输出火车票信息

System.out.println(trainService.getName());

System.out.println("车次------出发地------到达地------票价");

if(tickets!=null)

{

for(int i=0;i

{

System.out.println(tickets[i].getId()+"------"+tickets[i].getStartCity()+"------"+tickets[i].getEndCity()+"------"+tickets[i].getPrice());

}

}

}

}