java作業程序，急求

package test;

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import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.util.HashMap;

import java.util.Map;

public class Test {

public static void main(String[] args) throws IOException{ ?

MapString, Room rooms =initRooms();

BufferedReader ctrl=new BufferedReader(new InputStreamReader(System.in));

getRoomState(rooms);

boolean exit = true;

while(exit){

println("");

print("菜單: ");

print(" 1:訂房");

print(" 2:退房");

print(" 3:查詢");

print(" 4:退出");

println("");

print(" 請輸入:");

String num =ctrl.readLine();

cls();

switch (num) {

??? ?case "1":

??? ??? ? print("房間號:");

??? ??? ? String rid = ctrl.readLine();

??? ??? ? print("帳號:");

??? ??? ? String user = ctrl.readLine();

??? ??? ? print("密碼:");

??? ??? ? String pwd = ctrl.readLine();

??? ??? ? print("住天數:");

??? ??? ? String day = ctrl.readLine();

??? ??? ? Room r = rooms.get(rid);

??? ??? ? if(r==null){

??? ??? ??? ? println("沒有此房間");

??? ??? ? }else{

??? ??? ??? ? r.setDay(Integer.parseInt(day));

??? ??? ??? ? r.setName(user);

??? ??? ??? ? r.setPwd(pwd);

??? ??? ??? ? rooms.put(r.getrId(),r);

??? ??? ??? ? println("訂房成功??！");

??? ??? ??? ? getRoomState(rooms);

??? ??? ? }

??? ??? ?break;

??? ?case "2":

??? ??? ?print("帳號:");

??? ??? ? String user2 = ctrl.readLine();

??? ??? ? print("密碼:");

??? ??? ? String pwd2 = ctrl.readLine();

??? ??? ? Room r2 =getRoowByUserAndPwd(rooms,user2,pwd2);

??? ??? ? if(r2==null){

??? ??? ??? ? println("你沒有訂房!!");

??? ??? ? }else{

??? ??? ??? ?r2.setName("");

??? ??? ??? ?r2.setPwd("");

??? ??? ??? ?r2.setDay(0);

??? ??? ??? ?rooms.put(r2.getrId(),r2);

??? ??? ??? ?println("退訂成功");

??? ??? ??? ?getRoomState(rooms);

??? ??? ? }

??? ??? ?break;

??? ?case "3":

??? ??? ? print("帳號:");

??? ??? ? String user3 = ctrl.readLine();

??? ??? ? print("天數:");

??? ??? ? String day3 = ctrl.readLine();

??? ??? ? Room r3 =getRoowByUserAndDay(rooms,user3,day3);

??? ??? ? if(r3==null){

??? ??? ??? ? println("你沒有訂房!!");

??? ??? ? }else{

??? ??? ??? ?println(r3.toString());

??? ??? ? }

??? ??? ?break;

??? ?case "4":exit = false ;break;

?}

getRoomState(rooms);

}

}

private static void getRoomState(MapString, Room rooms) {

println("房間情況:");

for (Room r : rooms.values()) {

?? println("房號:"+r.getrId()+"=" + r.getPrice()+" 狀態:"+r.isEmptyRoom());

}

}

private static Room getRoowByUserAndDay(MapString, Room rooms,String user,String day) {

for (Room r : rooms.values()) {

?? if(r.getName().equals(user) day.equals(r.getDay()+""))

??? ?? return r;

}

return null;

}

private static Room getRoowByUserAndPwd(MapString, Room rooms,String user,String pwd) {

for (Room r : rooms.values()) {

?? if(r.getName().equals(user) pwd.equals(r.getPwd()+""))

??? ?? return r;

}

return null;

}

/**

* 初始化房間

*/

private static MapString, Room initRooms() {

MapString, Room result = new HashMapString, Room();

result.put("8001", new Room("8001",100.0));

result.put("8002", new Room("8002",100.0));

result.put("8003", new Room("8003",100.0));

result.put("8004", new Room("8004",200.0));

result.put("8005", new Room("8005",200.0));

result.put("8006", new Room("8006",200.0));

result.put("8007", new Room("8007",300.0));

result.put("8008", new Room("8008",300.0));

result.put("8009", new Room("8009",300.0));

return result;

}

public static void cls() throws IOException{

Runtime.getRuntime().exec("clear");

}

public static void println(Object str){

System.out.println(str);

}

public static void print(Object str){

System.out.print(str);

}

}

class Room{

private String rId="";

private String name="";

private String pwd="";

private int day=0;

private double price=0.0;

public String isEmptyRoom(){

return this.name.equals("")?"空房間":"已出租";

}

public Room(String rId, double price) {

this.rId = rId;

this.price = price;

}

@Override

public String toString() {

return "房號=" + rId + ", 用戶=" + name + ", 天數=" + day

??? ?+ ", 租金=" + price + ", 總金額=" + (price*day);

}

public Room(String name, String pwd, int day) {

this.name = name;

this.pwd = pwd;

this.day = day;

}

public Room() {

}

public String getrId() {

return rId;

}

public void setrId(String rId) {

this.rId = rId;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public String getPwd() {

return pwd;

}

public void setPwd(String pwd) {

this.pwd = pwd;

}

public int getDay() {

return day;

}

public void setDay(int day) {

this.day = day;

}

public double getPrice() {

return price;

}

public void setPrice(double price) {

this.price = price;

}

}

比較粗糙將就

從網站上訂房，java程序如何解決兩個客戶訂到同一間房

同步問題吧，，，把房間設置狀態，及時更新，，保證數據狀態一致，，，就可以處理了

求用Java寫的網上訂房程序 要有酒店類 房間類 客戶類 訂房記錄類 模擬一個人訂房操作

酒店類

package fdsa;

public class Hotel {

private String hotelID;

private String hotelName;

private String hoteladdess;

public String getHotelID() {

return hotelID;

}

public void setHotelID(String hotelID) {

this.hotelID = hotelID;

}

public String getHotelName() {

return hotelName;

}

public void setHotelName(String hotelName) {

this.hotelName = hotelName;

}

public String getHoteladdess() {

return hoteladdess;

}

public void setHoteladdess(String hoteladdess) {

this.hoteladdess = hoteladdess;

}

public String getHotelPhone() {

return hotelPhone;

}

public void setHotelPhone(String hotelPhone) {

this.hotelPhone = hotelPhone;

}

private String hotelPhone;

}

客戶類

public class Client{

private String clientName;

private String clientID;

public String getClientName() {

return clientName;

}

public void setClientName(String clientName) {

this.clientName = clientName;

}

public String getClientID() {

return clientID;

}

public void setClientID(String clientID) {

this.clientID = clientID;

}

}

房間類

public class Room{

private String roomID;

private Hotel hotelID;

public String getRoomID() {

return roomID;

}

public void setRoomID(String roomID) {

this.roomID = roomID;

}

public Hotel getHotelID() {

return hotelID;

}

public void setHotelID(Hotel hotelID) {

this.hotelID = hotelID;

}

public String getRoomAmount() {

return roomAmount;

}

public void setRoomAmount(String roomAmount) {

this.roomAmount = roomAmount;

}

private String roomAmount;

}