Java 面向对象 之 接口 火车票实例

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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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