房屋租赁系统-java

思维导图：业务逻辑

类的存放：

工具类 Utility

package study.houserent.util;
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;}
}

House类

package study.houserent.domain;
/*
house类的对象代表一个信息*/
public class House {private  int id;private  String name;private  String iphone;private  int rent;//ctrl +aprivate  String 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 String getIphone() {return iphone;}public void setIphone(String iphone) {this.iphone = iphone;}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;}public House(int id, String name, String iphone, int rent, String state) {this.id = id;this.name = name;this.iphone = iphone;this.rent = rent;this.state = state;}@Overridepublic String toString() {return  id + "\t"+ name + "\t" + iphone + "\t" + rent + "\t"+ state ;}
}

HouseSerive类

package study.houserent.serive;
import study.houserent.domain.House;
import study.houserent.atil.Utility;public class HouseService {private  House[] houses;private int houseNums=1;private int idCounter=1;public boolean add(House newhouse){if(houseNums==houses.length){System.out.println("已满");return  false;}houses[houseNums]=newhouse;houseNums++;idCounter++;newhouse.setId(idCounter);
//        newhouse.setId(++idCounter);return true;}public House changeID(int change){for(int i=0;i<houseNums;i++){if(houses[i].getId()==change){System.out.print("姓名：");String name= Utility.readString(8);System.out.print("电话：");String phone=Utility.readString(12);System.out.print("月租: ");int rent=Utility.readInt();System.out.println("状态：");String state =Utility.readString(3);houses[i].setName(name);houses[i].setIphone(phone);houses[i].setRent(rent);houses[i].setState(state);return houses[i];}}return null;}public House findById(int findid){for(int i=0;i<houseNums;i++){if(findid==houses[i].getId()){return houses[i];}}return null;}public boolean del(int delid){int  index=-1;for(int i=0;i<houseNums;i++){if(delid==houses[i].getId()){index=i;}}if(index==-1){return false;}else{for(int i=index;i<houseNums-1;i++){houses[i]=houses[i+1];}houses[--houseNums]=null;return true;}}public HouseService(int size){houses =new House[size];houses[0]=new House(1,"A","100",2000,"未出租");}public House[] list() {return houses;}
}

HouseView类

package study.houserent.views;
import study.houserent.domain.House;
import study.houserent.serive.HouseService;
import study.houserent.atil.Utility;
public class HouseView {private boolean loop=true;private char key=' ';public HouseService houseService=new HouseService(10);public void exit(){char c=Utility.readConfirmSelection();if(c=='Y'){loop=false;}}public void addhouse(){System.out.println("===========添加房屋==========");System.out.print("姓名：");String name=Utility.readString(8);System.out.print("电话：");String phone=Utility.readString(12);System.out.print("地址：");String address=Utility.readString(16);System.out.print("月租: ");int rent=Utility.readInt();System.out.println("状态：");String state =Utility.readString(3);House newhouse = new House(0,name, phone, rent, state);if(houseService.add(newhouse)){System.out.println("==========添加房屋=========");}else{System.out.println("========添加房屋失败=======");}}public void findHouse(){System.out.println("=========查找房屋信息=======");System.out.println("输入查找的房间号：");int findid=Utility.readInt();House house=houseService.findById(findid);System.out.println((house==null)?"=======查找失败=====":house);}public void listHouses(){System.out.println("============房屋出租系统=======");System.out.println("编号  房主  电话  地址  状态");House[] houses=houseService.list();for(Object q:houses){if(q==null);else System.out.println(q);}System.out.println("房屋列表显示完毕");}public void changeHouses(){System.out.println("=====修改房屋信息========");System.out.println("修改的房间号：");int change=Utility.readInt();House house=houseService.changeID(change);System.out.println((house==null)?"=======不存在=====":house);}public void    delHouse(){System.out.println("================删除房屋============");System.out.println("请输入待删除房屋的编号：");int deTid=Utility.readInt();if(deTid==-1){System.out.println("放弃删除房屋");return;}char choice=Utility.readConfirmSelection();if(choice=='Y'){//在调用方法if(houseService.del(deTid)){System.out.println("===========删除房屋信息成功=========");}else{System.out.println("=============删除失败===========");}}else{System.out.println("放弃删除房屋");}}public void mainMenu (){do{System.out.println("=============房屋租赁系统===========");System.out.println("\t\t\t[新 增 房 源]");System.out.println("\t\t\t[查 找 房 间]");System.out.println("\t\t\t[删 除 房 屋 信 息]");System.out.println("\t\t\t[修 改 房 屋 信 息]");System.out.println("\t\t\t[房 屋 列 表]");System.out.println("\t\t\t 其输入你得选择【1-6】");key= Utility.readChar();switch( key){case '1':System.out.println("新 增");addhouse();listHouses();break;case '2':System.out.println("查 找 房 间");findHouse();listHouses();break;case '3':System.out.println("删除房屋信息");delHouse();listHouses();break;case '4':System.out.println("修改房屋信息");changeHouses();listHouses();break;case '5':System.out.println("房屋列表");listHouses();break;case '6':exit();System.out.println("退出");listHouses();}}while(loop);}}

HouserentApp类 运行入口

package study.houserent;import study.houserent.domain.House;
import study.houserent.views.HouseView;public class houseRentApp {public static void main(String[] args) {//创造程序入口new HouseView().mainMenu();System.out.println("=========你退出房屋出租系统===============");}
}