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=>N
            String 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 +a
    private  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;
    }

    @Override
    public 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===============");
    }
}