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/**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 < tickets.length; i++) {System.out.println(tickets[i].getId() + "------" + tickets[i].getStartCity() + "------" + tickets[i].getEndCity() + "------" + tickets[i].getPrice());}}}
}

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