项目设计-程序框架图 (分层模式=>当软件比较复杂,需要模式管理)
package com.hspedu.houserent.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=>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;
}
}
测试类
package com.hspedu.houserent.utils;
public class TestUtility {
public static void main(String[] args) {
//这是一个测试类,使用完毕就可删除
//要求输入一个字符串,长度最大为3
//String s = Utility.readString(3);
//System.out.println("s="+s);
//要求输入一个字符串,长度最大为10,如果用户直接回车,就给一个默认值
//"liushaolin",就把方法当做api使用即可
String s2 = Utility.readString(10,"liushaolin");
System.out.println("s2="+s2);
//类.方法()=》因为静态方法是static时,就是一个静态方法
//注意:静态方法可以直接通过类名调用
}
}
package com.hspedu.houserent.domain;
/**
* House类的对象表示一个房屋信息
*/
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 String phone;
private String address;
private int rent;
private String state;
public House(int id, String name, String 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 String getPhone() {
return phone;
}
public void setPhone(String 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;
}
//为了方便输出对象信息,我们实现toString方法
@Override
public String toString() {
return id +
"\t\t" + name +
"\t\t" + phone +
"\t\t" + address +
"\t\t" + rent +
"\t\t" + state;
}
}
功能说明
用户打开软件, 可以看到主菜单,可以退出软件
思路分析:
在 HouseView.java 中,编写一个方法 mainMenu,显示菜单
代码实现:
package com.hspedu.houserent.view;
import com.hspedu.houserent.utils.Utility;
/**
* 1.显示页面
* 2.接收用户信息
* 3。调用HouseService完成对房屋的各种操作
*/
public class HouseView {
//显示主菜单
private boolean loop =true;//控制显示菜单
private char key =' ';//接收用户选择
public void mainMenue(){
do {
System.out.println("============房屋出租系统===============");
System.out.println("\t\t\t1 新增房源");
System.out.println("\t\t\t2 查找房屋");
System.out.println("\t\t\t3 删除房屋信息");
System.out.println("\t\t\t4 修改房屋信息");
System.out.println("\t\t\t5 显示房屋信息");//房屋列表
System.out.println("\t\t\t6 退 出");
System.out.println("请输入你的选择(1-6)");
key = Utility.readChar();
switch (key){
case '1':
System.out.println("新增");
break;
case '2':
System.out.println("查找");
break;
case '3':
System.out.println("删除");
break;
case '4':
System.out.println("修改");
break;
case '5':
System.out.println("显示");//房屋列表
break;
case '6':
System.out.println("退 出");
loop = false;
break;
}
}while(loop);
}
}
package com.hspedu.houserent;
import com.hspedu.houserent.view.HouseView;
public class HouseRentApp {
public static void main(String[] args) {
new HouseView().mainMenue();
}
}
package com.hspedu.houserent.service;
import com.hspedu.houserent.domain.House;
/**
* HouseService=>类【业务层】
* 1.相应HouseView的调用
* 2.完成对房屋信息的各种操作【增删改查】
*
*/
public class HouseService {
private House[] houses;//保存House对象
public HouseService(int size){
houses =new House[size];//当创建HouseService对象,指定数组大小
//为了测试列表信息,初始化列表对象
houses[0] = new House(1,"Jach","112",
"海定区",2000,"未出租");
}
//list 方法,返回所有房屋信息
public House [] list(){
return houses;
}
}
package com.hspedu.houserent.view;
import com.hspedu.houserent.domain.House;
import com.hspedu.houserent.service.HouseService;
import com.hspedu.houserent.utils.Utility;
/**
* 1.显示页面
* 2.接收用户信息
* 3。调用HouseService完成对房屋的各种操作
*/
public class HouseView {
//显示主菜单
private boolean loop =true;//控制显示菜单
private char key =' ';//接收用户选择
private HouseService houseService = new HouseService(10);
//编写listHouse()显示房屋列表
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++) {//代码不够完善,实际房屋可能没有10个,进行判断
if (houses[i]==null)
break;
System.out.println(houses[i].toString());
}
System.out.println("===================房屋列表显示完毕==============");
}
public void mainMenue(){
do {
System.out.println("============房屋出租系统===============");
System.out.println("\t\t\t1 新增房源");
System.out.println("\t\t\t2 查找房屋");
System.out.println("\t\t\t3 删除房屋信息");
System.out.println("\t\t\t4 修改房屋信息");
System.out.println("\t\t\t5 显示房屋信息");//房屋列表
System.out.println("\t\t\t6 退 出");
System.out.println("请输入你的选择(1-6)");
key = Utility.readChar();
switch (key){
case '1':
System.out.println("新增");
break;
case '2':
System.out.println("查找");
break;
case '3':
System.out.println("删除");
break;
case '4':
System.out.println("修改");
break;
case '5':
listHouse()//房屋列表
break;
case '6':
System.out.println("退 出");
loop = false;
break;
}
}while(loop);
}
}
package com.hspedu.houserent.view;
import com.hspedu.houserent.domain.House;
import com.hspedu.houserent.service.HouseService;
import com.hspedu.houserent.utils.Utility;
/**
* 1.显示页面
* 2.接收用户信息
* 3。调用HouseService完成对房屋的各种操作
*/
public class HouseView {
//显示主菜单
private boolean loop =true;//控制显示菜单
private char key =' ';//接收用户选择
private HouseService houseService = new HouseService(10);
//编写listHouse()显示房屋列表
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++) {//代码不够完善,实际房屋可能没有10个,进行判断
if (houses[i]==null)
break;
System.out.println(houses[i].toString());
}
System.out.println("===================房屋列表显示完毕==============");
}
//addHouse()接收输入,创建House对象,调用add方法
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.print("状态:");
String state =Utility.readString(3);
//创建新的House对象
//创建一个新的House对象,系统分配
House house = new House(0, name, phone, address, rent, state);
if (houseService.add(house)){
System.out.println("===================添加房屋成功==============");
}
else {
System.out.println("===================添加房屋失败==============");
}
}
public void mainMenue(){
do {
System.out.println("============房屋出租系统===============");
System.out.println("\t\t\t1 新增房源");
System.out.println("\t\t\t2 查找房屋");
System.out.println("\t\t\t3 删除房屋信息");
System.out.println("\t\t\t4 修改房屋信息");
System.out.println("\t\t\t5 显示房屋信息");//房屋列表
System.out.println("\t\t\t6 退 出");
System.out.println("请输入你的选择(1-6)");
key = Utility.readChar();
switch (key){
case '1':
addHouse();
break;
case '2':
System.out.println("查找");
break;
case '3':
System.out.println("删除");
break;
case '4':
System.out.println("修改");
break;
case '5':
listHouse();//房屋列表
break;
case '6':
System.out.println("退 出");
loop = false;
break;
}
}while(loop);
}
}
package com.hspedu.houserent.service;
import com.hspedu.houserent.domain.House;
/**
* HouseService=>类【业务层】
* 1.相应HouseView的调用
* 2.完成对房屋信息的各种操作【增删改查】
*
*/
public class HouseService {
private House[] houses;//保存House对象
private int houseNumbers = 1;//记录当前有多少房屋信息
private int idCounter = 1;//记录当前的id增长到哪个值
public HouseService(int size){
houses =new House[size];//当创建HouseService对象,指定数组大小
//为了测试列表信息,初始化列表对象
houses[0] = new House(1,"Jach","112",
"海定区",2000,"未出租");
}
//list 方法,返回所有房屋信息
public House [] list(){
return houses;
}
//add方法
public boolean add(House newhouse){
//判断是否还可以添加(暂时不考虑数组扩容)
if (houseNumbers==houses.length)//不能再添加
{
System.out.println("数组已满不能再添加");
return false;
}
else{
//把newHouse对象加入到数组空间
houses[houseNumbers]=newhouse;
houseNumbers++;
//还需要设计一个id自增长
idCounter++;
newhouse.setId(idCounter);//更新newhouse的id
return true;
}
}
}
package com.hspedu.houserent.view;
import com.hspedu.houserent.domain.House;
import com.hspedu.houserent.service.HouseService;
import com.hspedu.houserent.utils.Utility;
/**
* 1.显示页面
* 2.接收用户信息
* 3。调用HouseService完成对房屋的各种操作
*/
public class HouseView {
//显示主菜单
private boolean loop =true;//控制显示菜单
private char key =' ';//接收用户选择
private HouseService houseService = new HouseService(10);
//编写delHouse()接收输入的id
public void delHouse(){
System.out.println("===================删除房屋信息==============");
System.out.print("请输入待删除房屋的编号(-1退出)");
int delId = Utility.readInt();
if (delId==-1)
{
System.out.println("===================放弃删除房屋信息==============");
return;
}
char choice=Utility.readConfirmSelection();//该方法本身就有循环判断逻辑
if (choice=='Y'){
if (houseService.del(delId)){
System.out.println("===================放弃删除房屋信息成功==============");
}else {
System.out.println("===================删除房屋信息失败【编号不存在】==============");
}
}else {
System.out.println("===================放弃删除房屋信息==============");
return;
}
}
//编写listHouse()显示房屋列表
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++) {//代码不够完善,实际房屋可能没有10个,进行判断
if (houses[i]==null)
break;
System.out.println(houses[i].toString());
}
System.out.println("===================房屋列表显示完毕==============");
}
//addHouse()接收输入,创建House对象,调用add方法
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.print("状态:");
String state =Utility.readString(3);
//创建新的House对象
//创建一个新的House对象,系统分配
House house = new House(0, name, phone, address, rent, state);
if (houseService.add(house)){
System.out.println("===================添加房屋成功==============");
}
else {
System.out.println("===================添加房屋失败==============");
}
}
public void mainMenue(){
do {
System.out.println("============房屋出租系统===============");
System.out.println("\t\t\t1 新增房源");
System.out.println("\t\t\t2 查找房屋");
System.out.println("\t\t\t3 删除房屋信息");
System.out.println("\t\t\t4 修改房屋信息");
System.out.println("\t\t\t5 显示房屋信息");//房屋列表
System.out.println("\t\t\t6 退 出");
System.out.println("请输入你的选择(1-6)");
key = Utility.readChar();
switch (key){
case '1':
addHouse();
break;
case '2':
System.out.println("查找");
break;
case '3':
delHouse();
break;
case '4':
System.out.println("修改");
break;
case '5':
listHouse();//房屋列表
break;
case '6':
System.out.println("退 出");
loop = false;
break;
}
}while(loop);
}
}
package com.hspedu.houserent.service;
import com.hspedu.houserent.domain.House;
/**
* HouseService=>类【业务层】
* 1.相应HouseView的调用
* 2.完成对房屋信息的各种操作【增删改查】
*
*/
public class HouseService {
private House[] houses;//保存House对象
private int houseNumbers = 1;//记录当前有多少房屋信息
private int idCounter = 1;//记录当前的id增长到哪个值
public HouseService(int size){
houses =new House[size];//当创建HouseService对象,指定数组大小
//为了测试列表信息,初始化列表对象
houses[0] = new House(1,"Jach","112",
"海定区",2000,"未出租");
}
//del方法 删除一个房屋信息
public boolean del(int delId){
//应该先找到删除的房屋信息对应的下标
int index=-1;
for (int i = 0; i
package com.hspedu.houserent.view;
import com.hspedu.houserent.domain.House;
import com.hspedu.houserent.service.HouseService;
import com.hspedu.houserent.utils.Utility;
/**
* 1.显示页面
* 2.接收用户信息
* 3。调用HouseService完成对房屋的各种操作
*/
public class HouseView {
//显示主菜单
private boolean loop =true;//控制显示菜单
private char key =' ';//接收用户选择
private HouseService houseService = new HouseService(10);
//退出
public void exit(){
char c =Utility.readConfirmSelection();
if (c=='Y')
{loop = false;}
}
//编写delHouse()接收输入的id
public void delHouse(){
System.out.println("===================删除房屋信息==============");
System.out.print("请输入待删除房屋的编号(-1退出)");
int delId = Utility.readInt();
if (delId==-1)
{
System.out.println("===================放弃删除房屋信息==============");
return;
}
char choice=Utility.readConfirmSelection();//该方法本身就有循环判断逻辑
if (choice=='Y'){
if (houseService.del(delId)){
System.out.println("===================放弃删除房屋信息成功==============");
}else {
System.out.println("===================删除房屋信息失败【编号不存在】==============");
}
}else {
System.out.println("===================放弃删除房屋信息==============");
return;
}
}
//编写listHouse()显示房屋列表
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++) {//代码不够完善,实际房屋可能没有10个,进行判断
if (houses[i]==null)
break;
System.out.println(houses[i].toString());
}
System.out.println("===================房屋列表显示完毕==============");
}
//addHouse()接收输入,创建House对象,调用add方法
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.print("状态:");
String state =Utility.readString(3);
//创建新的House对象
//创建一个新的House对象,系统分配
House house = new House(0, name, phone, address, rent, state);
if (houseService.add(house)){
System.out.println("===================添加房屋成功==============");
}
else {
System.out.println("===================添加房屋失败==============");
}
}
public void mainMenue(){
do {
System.out.println("============房屋出租系统===============");
System.out.println("\t\t\t1 新增房源");
System.out.println("\t\t\t2 查找房屋");
System.out.println("\t\t\t3 删除房屋信息");
System.out.println("\t\t\t4 修改房屋信息");
System.out.println("\t\t\t5 显示房屋信息");//房屋列表
System.out.println("\t\t\t6 退 出");
System.out.println("请输入你的选择(1-6)");
key = Utility.readChar();
switch (key){
case '1':
addHouse();
break;
case '2':
System.out.println("查找");
break;
case '3':
delHouse();
break;
case '4':
System.out.println("修改");
break;
case '5':
listHouse();//房屋列表
break;
case '6':
exit();
break;
}
}while(loop);
}
}
package com.hspedu.houserent.view;
import com.hspedu.houserent.domain.House;
import com.hspedu.houserent.service.HouseService;
import com.hspedu.houserent.utils.Utility;
/**
* 1.显示页面
* 2.接收用户信息
* 3。调用HouseService完成对房屋的各种操作
*/
public class HouseView {
//显示主菜单
private boolean loop =true;//控制显示菜单
private char key =' ';//接收用户选择
private HouseService houseService = new HouseService(10);
//查找
public void findHouse(){
System.out.println("===================查找房屋信息==============");
System.out.print("请输入待查找房屋的编号");
int findId=Utility.readInt();
House house=houseService.findById(findId);
if(house!=null){
System.out.println(house);
}
else {
System.out.println("============查找的房屋信息id不存在========");
}
}
//退出
public void exit(){
char c =Utility.readConfirmSelection();
if (c=='Y')
{loop = false;}
}
//编写delHouse()接收输入的id
public void delHouse(){
System.out.println("===================删除房屋信息==============");
System.out.print("请输入待删除房屋的编号(-1退出)");
int delId = Utility.readInt();
if (delId==-1)
{
System.out.println("===================放弃删除房屋信息==============");
return;
}
char choice=Utility.readConfirmSelection();//该方法本身就有循环判断逻辑
if (choice=='Y'){
if (houseService.del(delId)){
System.out.println("===================放弃删除房屋信息成功==============");
}else {
System.out.println("===================删除房屋信息失败【编号不存在】==============");
}
}else {
System.out.println("===================放弃删除房屋信息==============");
return;
}
}
//编写listHouse()显示房屋列表
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++) {//代码不够完善,实际房屋可能没有10个,进行判断
if (houses[i]==null)
break;
System.out.println(houses[i].toString());
}
System.out.println("===================房屋列表显示完毕==============");
}
//addHouse()接收输入,创建House对象,调用add方法
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.print("状态:");
String state =Utility.readString(3);
//创建新的House对象
//创建一个新的House对象,系统分配
House house = new House(0, name, phone, address, rent, state);
if (houseService.add(house)){
System.out.println("===================添加房屋成功==============");
}
else {
System.out.println("===================添加房屋失败==============");
}
}
public void mainMenue(){
do {
System.out.println("============房屋出租系统===============");
System.out.println("\t\t\t1 新增房源");
System.out.println("\t\t\t2 查找房屋");
System.out.println("\t\t\t3 删除房屋信息");
System.out.println("\t\t\t4 修改房屋信息");
System.out.println("\t\t\t5 显示房屋信息");//房屋列表
System.out.println("\t\t\t6 退 出");
System.out.println("请输入你的选择(1-6)");
key = Utility.readChar();
switch (key){
case '1':
addHouse();
break;
case '2':
findHouse();
break;
case '3':
delHouse();
break;
case '4':
System.out.println("修改");
break;
case '5':
listHouse();//房屋列表
break;
case '6':
exit();
break;
}
}while(loop);
}
}
package com.hspedu.houserent.service;
import com.hspedu.houserent.domain.House;
/**
* HouseService=>类【业务层】
* 1.相应HouseView的调用
* 2.完成对房屋信息的各种操作【增删改查】
*
*/
public class HouseService {
private House[] houses;//保存House对象
private int houseNumbers = 1;//记录当前有多少房屋信息
private int idCounter = 1;//记录当前的id增长到哪个值
public HouseService(int size){
houses =new House[size];//当创建HouseService对象,指定数组大小
//为了测试列表信息,初始化列表对象
houses[0] = new House(1,"Jach","112",
"海定区",2000,"未出租");
}
//find 方法 返回House对象或者为空
public House findById(int findId){
for (int i = 0; i < houseNumbers; i++) {
if(houses[i].getId()==findId)
{return houses[i];}
}
return null;
}
//del方法 删除一个房屋信息
public boolean del(int delId){
//应该先找到删除的房屋信息对应的下标
int index=-1;
for (int i = 0; i
package com.hspedu.houserent.view;
import com.hspedu.houserent.domain.House;
import com.hspedu.houserent.service.HouseService;
import com.hspedu.houserent.utils.Utility;
/**
* 1.显示页面
* 2.接收用户信息
* 3。调用HouseService完成对房屋的各种操作
*/
public class HouseView {
//显示主菜单
private boolean loop =true;//控制显示菜单
private char key =' ';//接收用户选择
private HouseService houseService = new HouseService(10);
//修改
public void updateHouse(){
System.out.println("===================修改房屋信息==============");
System.out.print("请输入待修改房屋的编号(-1退出)");
int updateId =Utility.readInt();
if (updateId==-1){
System.out.println("===================放弃修改房屋信息==============");
return;
}
//根据输入的updateId查找对象
House house =houseService.findById(updateId);
if(house==null){
System.out.println("==============修改房屋信息编号不存在,无法修改==============");
return;
}
System.out.print("姓名("+house.getName()+"):");
String name =Utility.readString(8,house.getName());//如果用户直接回车,表示不修改该字段
if(!house.getName().equals(name)){//修改
house.setName(name);
}
System.out.print("电话("+house.getPhone()+"):");
String phone =Utility.readString(12,house.getPhone());//如果用户直接回车,表示不修改该字段
if(!house.getPhone().equals(phone)){//修改
house.setPhone(phone);
}
System.out.print("地址("+house.getAddress()+"):");
String address = Utility.readString(18,house.getAddress());
if(!house.getAddress().equals(address)){//修改
house.setAddress(address);
}
System.out.print("租金("+house.getRent()+"):");
int Rent =Utility.readInt(house.getRent());
if(!(Rent==house.getRent())){
house.setRent(Rent);
}
System.out.print("状态("+house.getState()+"):");
String state = Utility.readString(3,house.getState());
if(!house.getState().equals(state)){//修改
house.setState(state);
}
System.out.println("==============修改房屋信息成功==============");
}
//查找
public void findHouse(){
System.out.println("===================查找房屋信息==============");
System.out.print("请输入待查找房屋的编号");
int findId=Utility.readInt();
House house=houseService.findById(findId);
if(house!=null){
System.out.println(house);
}
else {
System.out.println("============查找的房屋信息id不存在========");
}
}
//退出
public void exit(){
char c =Utility.readConfirmSelection();
if (c=='Y')
{loop = false;}
}
//编写delHouse()接收输入的id
public void delHouse(){
System.out.println("===================删除房屋信息==============");
System.out.print("请输入待删除房屋的编号(-1退出)");
int delId = Utility.readInt();
if (delId==-1)
{
System.out.println("===================放弃删除房屋信息==============");
return;
}
char choice=Utility.readConfirmSelection();//该方法本身就有循环判断逻辑
if (choice=='Y'){
if (houseService.del(delId)){
System.out.println("===================放弃删除房屋信息成功==============");
}else {
System.out.println("===================删除房屋信息失败【编号不存在】==============");
}
}else {
System.out.println("===================放弃删除房屋信息==============");
return;
}
}
//编写listHouse()显示房屋列表
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++) {//代码不够完善,实际房屋可能没有10个,进行判断
if (houses[i]==null)
break;
System.out.println(houses[i].toString());
}
System.out.println("===================房屋列表显示完毕==============");
}
//addHouse()接收输入,创建House对象,调用add方法
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.print("状态:");
String state =Utility.readString(3);
//创建新的House对象
//创建一个新的House对象,系统分配
House house = new House(0, name, phone, address, rent, state);
if (houseService.add(house)){
System.out.println("===================添加房屋成功==============");
}
else {
System.out.println("===================添加房屋失败==============");
}
}
public void mainMenue(){
do {
System.out.println("============房屋出租系统===============");
System.out.println("\t\t\t1 新增房源");
System.out.println("\t\t\t2 查找房屋");
System.out.println("\t\t\t3 删除房屋信息");
System.out.println("\t\t\t4 修改房屋信息");
System.out.println("\t\t\t5 显示房屋信息");//房屋列表
System.out.println("\t\t\t6 退 出");
System.out.println("请输入你的选择(1-6)");
key = Utility.readChar();
switch (key){
case '1':
addHouse();
break;
case '2':
findHouse();
break;
case '3':
delHouse();
break;
case '4':
updateHouse();
break;
case '5':
listHouse();//房屋列表
break;
case '6':
exit();
break;
}
}while(loop);
}
}
package com.hspedu.houserent.service;
import com.hspedu.houserent.domain.House;
/**
* HouseService=>类【业务层】
* 1.相应HouseView的调用
* 2.完成对房屋信息的各种操作【增删改查】
*
*/
public class HouseService {
private House[] houses;//保存House对象
private int houseNumbers = 1;//记录当前有多少房屋信息
private int idCounter = 1;//记录当前的id增长到哪个值
public HouseService(int size){
houses =new House[size];//当创建HouseService对象,指定数组大小
//为了测试列表信息,初始化列表对象
houses[0] = new House(1,"Jach","112",
"海定区",2000,"未出租");
}
//find 方法 返回House对象或者为空
public House findById(int findId){
for (int i = 0; i < houseNumbers; i++) {
if(houses[i].getId()==findId)
{return houses[i];}
}
return null;
}
//del方法 删除一个房屋信息
public boolean del(int delId){
//应该先找到删除的房屋信息对应的下标
int index=-1;
for (int i = 0; i