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韩顺平之第九章综合练习-----------房屋出租管理系统

news 2025/7/5 15:03:21

综合练习-------------房屋出租管理系统

首先进行分层：
创建项目包：

创建工具类

在utils包下创建Utility类

package com.rain.house.utils;

/**工具类的作用:处理各种情况的用户输入，并且能够按照程序员的需求，得到用户的控制台输入。*/

import java.util.*;
/**

*/
public class Utility {//静态属性。。。private static Scanner scanner = new Scanner(System.in);

/*** 功能：读取键盘输入的一个菜单选项，值：1——5的范围* @return 1——5*/public static char readMenuSelection() {char c;for (; ; ) {String str = readKeyBoard(1, false);//包含一个字符的字符串c = str.charAt(0);//将字符串转换成字符char类型if (c != '1' && c != '2' &&c != '3' && c != '4' && c != '5') {System.out.print("选择错误，请重新输入：");} else break;}return c;}
/*** 功能：读取键盘输入的一个字符* @return 一个字符*/public static char readChar() {String str = readKeyBoard(1, false);//就是一个字符return str.charAt(0);}/*** 功能：读取键盘输入的一个字符，如果直接按回车，则返回指定的默认值；否则返回输入的那个字符* @param defaultValue 指定的默认值* @return 默认值或输入的字符*/
public static char readChar(char defaultValue) {String str = readKeyBoard(1, true);//要么是空字符串，要么是一个字符return (str.length() == 0) ? defaultValue : str.charAt(0);}
/*** 功能：读取键盘输入的整型，长度小于2位* @return 整数*/public static int readInt() {int n;for (; ; ) {String str = readKeyBoard(10, false);//一个整数，长度<=10位try {n = Integer.parseInt(str);//将字符串转换成整数break;} catch (NumberFormatException e) {System.out.print("数字输入错误，请重新输入：");}}return n;}/*** 功能：读取键盘输入的 整数或默认值，如果直接回车，则返回默认值，否则返回输入的整数* @param defaultValue 指定的默认值* @return 整数或默认值*/public static int readInt(int defaultValue) {int n;for (; ; ) {String str = readKeyBoard(10, true);if (str.equals("")) {return defaultValue;}
//异常处理...try {n = Integer.parseInt(str);break;} catch (NumberFormatException e) {System.out.print("数字输入错误，请重新输入：");}}return n;}
/*** 功能：读取键盘输入的指定长度的字符串* @param limit 限制的长度* @return 指定长度的字符串*/
public static String readString(int limit) {return readKeyBoard(limit, false);}
/*** 功能：读取键盘输入的指定长度的字符串或默认值，如果直接回车，返回默认值，否则返回字符串* @param limit 限制的长度* @param defaultValue 指定的默认值* @return 指定长度的字符串*/
public static String readString(int limit, String defaultValue) {String str = readKeyBoard(limit, true);return str.equals("")? defaultValue : str;}

/*** 功能：读取键盘输入的确认选项，Y或N* 将小的功能，封装到一个方法中.* @return Y或N*/public static char readConfirmSelection() {System.out.println("请输入你的选择(Y/N): 请小心选择");char c;for (; ; ) {//无限循环//在这里，将接受到字符，转成了大写字母//y => Y n=>NString str = readKeyBoard(1, false).toUpperCase();c = str.charAt(0);if (c == 'Y' || c == 'N') {break;} else {System.out.print("选择错误，请重新输入：");}}return c;}
/*** 功能： 读取一个字符串* @param limit 读取的长度* @param blankReturn 如果为true ,表示 可以读空字符串。*                    如果为false表示 不能读空字符串。**  如果输入为空，或者输入大于limit的长度，就会提示重新输入。* @return*/private static String readKeyBoard(int limit, boolean blankReturn) {
//定义了字符串String line = "";
//scanner.hasNextLine() 判断有没有下一行while (scanner.hasNextLine()) {line = scanner.nextLine();//读取这一行
//如果line.length=0, 即用户没有输入任何内容，直接回车if (line.length() == 0) {if (blankReturn) return line;//如果blankReturn=true,可以返回空串else continue; //如果blankReturn=false,不接受空串，必须输入内容}
//如果用户输入的内容大于了 limit，就提示重写输入//如果用户如的内容 >0 <= limit ,我就接受if (line.length() < 1 || line.length() > limit) {System.out.print("输入长度（不能大于" + limit + "）错误，请重新输入：");continue;}break;}
return line;}
}

在domain包下创建House类，包装房屋信息

package com.rain.house.domain;

public class House {// 编号  房主  电话  地址  月租  状态（未出租/已出租）private int id;private String name;private int phone;private String address;private int rent;private String state;
public House(int id, String name, int phone, String address, int rent, String state) {this.id = id;this.name = name;this.phone = phone;this.address = address;this.rent = rent;this.state = state;}
public int getId() {return id;}
public void setId(int id) {this.id = id;}
public String getName() {return name;}
public void setName(String name) {this.name = name;}
public int getPhone() {return phone;}
public void setPhone(int phone) {this.phone = phone;}
public String getAddress() {return address;}
public void setAddress(String address) {this.address = address;}
public int getRent() {return rent;}
public void setRent(int rent) {this.rent = rent;}
public String getState() {return state;}
public void setState(String state) {this.state = state;}
@Overridepublic String toString() {return id +"\t" + name +"\t" + phone +"\t" + address +"\t" + rent +"\t" + state;}
}

HouseService类业务层（封装一些方法）

package com.rain.house.service;

import com.rain.house.domain.House;

/*** HouseService.java <=> 类 [业务层]* 响应HouseView的调用* 完成对房屋信息的crud操作*/

public class HouseService {private House[] houses; //保存House对象private int houseNums = 1; // 记录当前有多少个房屋信息private int idCounter = 1; // 记录id增长到哪个值了
public HouseService(int size) {houses = new House[size]; // 当创建HouseService对象，指定数组大小// 默认房屋信息houses[0] = new House(1,"jack","123","海淀区",3200,"未出租");}
public House find(int findId){for (int i = 0; i < houseNums; i++) {if(houses[i].getId() == findId){return houses[i];}}return null;}
public boolean del(int delId) {if(houseNums == 0) return false;// 设置标记当前数组下标的标记符、int index = -1;//遍历整个房屋信息找到对应的编号for (int i = 0; i < houseNums; i++) {if(houses[i].getId() == delId){index = i; //得到当前数组下标}}// 如果没得到对应的数组下标说明不存在if(index == -1){return false;}else{ //否则 把索引后面的房屋信息往前挪一位for (int i = index; i < houseNums - 1; i++) {houses[i] = houses[i+1];}houses[--houseNums] = null; //最后一个置为空return true;}}
//add方法，添加新对象，返回booleanpublic boolean add(House newHouse){//判断是否还可以继续添加（暂时不考虑数组扩容）if(houseNums == houses.length){// 考虑一下扩容System.out.println("数组已满，不能再添加了。。。。。。");return false;}//把newHouse对象加入到数组，新增加了一个房屋houses[houseNums++] = newHouse;//我们需要设计好id的自增机制，然后更新newHouse的idnewHouse.setId(++idCounter);return true;}
public House[] list(){return houses;}
}

HouseView类（界面层）调用一些HouseService里面的方法

package com.rain.house.view;

import com.rain.house.domain.House;
import com.rain.house.service.HouseService;
import com.rain.house.utils.Utility;

import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;

/**** 1、显示界面* 2、接收用户的输入* 3、调用HouseService 完成堆房屋信息的各种操作*/

public class HouseView {
private boolean loop = true; //控制菜单private char key = ' ';   // 接收用户输入的信息private HouseService houseService = new HouseService(10);
//修改操作public void updateHouse(){System.out.println("-----------------------------房屋修改-----------------------------");System.out.print("请输入待删除的房屋编号（-1退出）：");int upId = Utility.readInt();if(upId == -1){System.out.println("退出修改操作~~~");return;}House house = new House();house = houseService.find(upId);if(house == null){System.out.println("您想要修改的房屋信息编号不存在！！！");return;}System.out.println("编号\t\t房主\t\t电话\t\t地址\t\t月租\t\t状态（未出租/已出租）");System.out.println(house);System.out.println("-----------------------------请输入新的信息-----------------------------");System.out.print("姓名：");String name = Utility.readString(8,"");if(!"".equals(name)){house.setName(name);}System.out.print("电话：");String phone = Utility.readString(11,"");if(!"".equals(phone)){house.setPhone(phone);}System.out.print("地址：");String address = Utility.readString(12,"");if(!"".equals(address)){house.setAddress(address);}System.out.print("月租：");int rent = Utility.readInt(-1);if(rent != -1){house.setRent(rent);}System.out.print("状态：");String state = Utility.readString(3,"");if(!"".equals(state)){house.setState(state);}
System.out.println("-----------------------------房屋修改后信息如下-----------------------------");System.out.println("编号\t\t房主\t\t电话\t\t地址\t\t月租\t\t状态（未出租/已出租）");System.out.println(house);System.out.println("-----------------------------房屋修改完毕！-----------------------------");}
//查找public void findHouse() {System.out.println("-----------------------------房屋查找-----------------------------");System.out.print("请输入待查找的房屋编号（-1退出）：");int findId = Utility.readInt();if(findId == -1){System.out.println("退出查找操作~~~");return;}House house = new House();house = houseService.find(findId);if(house == null){System.out.println("您想要查找的房屋信息编号不存在！！！");return;}System.out.println("编号\t\t房主\t\t电话\t\t地址\t\t月租\t\t状态（未出租/已出租）");System.out.println(house);System.out.println("-----------------------------房屋查找完毕！-----------------------------");}

//退出public void exit() {char c = Utility.readConfirmSelection();if(c == 'Y'){loop = false;}}
//编写delHouse() 接收输入的id，调用Service 的 del方法public void delHouse() {System.out.println("-----------------------------房屋删除-----------------------------");System.out.print("请输入待删除的房屋编号（-1退出）：");int delId = Utility.readInt();if(delId == -1){System.out.println("退出删除操作~~~");return;}// 该方法内部就有循环，如果不输入 Y / N 就不能跳出循环char choice = Utility.readConfirmSelection();if(choice == 'Y'){if (houseService.del(delId)){System.out.println("删除成功！！！");}else {System.out.println("删除失败！！！");}}else {System.out.println("退出删除操作~~~");}

System.out.println("-----------------------------房屋删除操作完毕-----------------------------");}
//编写addHouse() 添加房屋信息public void addHouse() {System.out.println("-----------------------------添加房屋------------------------------");System.out.print("姓名：");String name = Utility.readString(8,"xxx\t");System.out.print("电话：");String phone = Utility.readString(11);System.out.print("地址：");String address = Utility.readString(12);System.out.print("月租：");int rent = Utility.readInt();System.out.print("状态：");String state = Utility.readString(3);House newHouse = new House(0,name,phone,address,rent,state);if(houseService.add(newHouse)){System.out.println("添加成功！！！");}else{System.out.println("添加失败~~~~");}
System.out.println("------------------------添加房屋完毕------------------------\n");}

//编写listHouse()显示房屋信息列表public void listHouse() {System.out.println("-----------------------------房屋列表-----------------------------");System.out.println("编号\t\t房主\t\t电话\t\t地址\t\t月租\t\t状态（未出租/已出租）");House[] houses = houseService.list(); // 得到所有房屋信息for (int i = 0; i < houses.length; i++) {if(houses[i] == null) break;System.out.println(houses[i].toString());}System.out.println("------------------------房屋列表信息显示完毕------------------------\n");}
//显示主菜单public void mainMenu() {
do{System.out.println("-----------------------------房屋出租系统------------------------------");System.out.println("\t\t\t 1 新  增  房  源");System.out.println("\t\t\t 2 查  找  房  屋");System.out.println("\t\t\t 3 删  除  房  屋");System.out.println("\t\t\t 4 修  改  房  屋  信  息");System.out.println("\t\t\t 5 房  屋  列  表");System.out.println("\t\t\t 6 退\t\t出");System.out.print("请输入你的选择（1-6）：");char c = Utility.readChar();if(c == '1'){addHouse();}else if(c == '2'){findHouse();}else if (c == '3'){delHouse();}else if (c == '4'){updateHouse();}else if (c == '5') {listHouse();}else{exit();}}while(loop);}
}

HouseRentApp类（主函数）

package com.rain.house;

import com.rain.house.view.HouseView;

public class HouseRentApp {public static void main(String[] args) {HouseView houseView = new HouseView();houseView.mainMenu();System.out.println("----------------------------退出房屋出租管理系统---------------------------");}
}