Java Help

I am writing a Hotel Booking Application.

On the sheet I have it says.

"If a room is not booked, the customer is null"

I guess I have to write an if statement somewhere to check if the room has been booked or not and then set the customer to null?

Does anyone know where I would write this code in here? I have wrote the classes like specified in this UML Diagram.



Here is the code I have for Room which I am guessing is where this if statement would be? Can anyone help me out?

Code:

import javax.swing.*;  
   
public class Room  
{  
    int roomNumber;  
    int n = roomNumber;  
      
    double rate;  
    double t = rate;  
      
    String customer;  
      
      
    Room()  
    {  
    }  
  
    Room(int n, double t)  
    {  
        if( n >= 201 && roomNumber <= 203)  
        {  
            t = 35;  
            customer = null;  
           
        }     
        else   
        {  
            System.out.println("Please enter a correct room number");  
        }  
    }  
      
    void bookRoom(String customer)  
    {  
          
          
    }  
      
    void clearBooking()  
    {  
          
    }  
  
    String getCustomer()  
    {  
        return customer;  
    }  
  
    double getRate()  
    {  
        return rate;  
    }  
  
    int getRoomNumber()  
    {  
        return roomNumber;  
    }  
  
    public String toString()  
    {  
        return customer;  
    }  
  
}   

 

Thanks for the reply.

So in the bookRoom constructor I should have an if statement checking if the Room is occupied? and then in the clearBooking I should have it set the customer to null?

 

Thanks for that I will have a go and see what I can get done.

I am new to Java and this is a re-sit Java Assignment I am doing for University.

I have till the 20th of August to get it done. This first part is only worth 10% but I have found it the hardest part LOL .

I moved on and got the GUI done for it which is worth 25% but then there is mouse events which I think I need this first part done before I can move on to the rest so I can get 40% to pass the Assignment.

 

Thanks alot for that.

I will give it a go tomorrow and post in this thread how I get on.

 

Just an update.

I used the second way and it compiled. I have not tested if it worked yet. I need to do some more stuff then write a test class.

I have another question if anyone can help. It also says "The Method bookRoom(String) will set the customer name.

I guess that I will have to have an input string with a scanner for the customers name?

Is this right? and do I have to write that code in the bookRoom(String) bit?

 

So I don't use the bookRoom(String) in room to set the customer name?

 

Oh I think I get it now.

So that second way I went with should stay in the Room class but to read the customers name and to test if the bookRoom works I should write a test class?

 

On my assignment sheet it says.

Write a seperate class with a main method that will test the three subclasses. The test class you will create objects of each subclass. Using the classes constructors, and output the results of calling the objects methods. A command line output using MSDOS will be sufficient for this.

Then underneath it has the things I have been working on.

All rooms have a room number and room rate.

All rooms may have a customer. Initially the customer will be null.

If a room is not booked, the customer is null.

The method to bookRoom(String) will set the customer name.

The method clearBooking() will set the customer to null

Bedrooms have an additional description giving the size of the room: either double or single.

MeetingRooms have a maximum capacity of the room.

The Room.toString() method should provide a text description of the room, including the name of the customer, if any

The toString() method the subclasses must override Room.toString() , providing additional information on the room(capacity or type of room).

You will be asked to save details of rooms. Remember to add the appropriate interface in the Room class declaration.


Does all of that have to go in the test class?

 

Edit :

I have got it to work but when I enter the customers name it does nothing. What should I be doing with it?

Code:

import java.util.Scanner;
import java.awt.*;
import javax.swing.*;

public class testRoom
{
    public static void main(String[] args)
    {
	   String customerName;
	   
	   do
	   {
		 String inputString = JOptionPane.showInputDialog(null,"Please Enter The Customers Name");
     	 Scanner nameScanner = new Scanner(inputString);               
     	 customerName = nameScanner.next();									
     	 String outputString = "The Customer Name Is "+ customerName;
     	 
 	 	}
 	 	while (customerName.length() < 3 || customerName.length() > 40);
	    
	    
	    
    }
    
}

 

Thanks.

If I type the name say SteveBruce it will show the full name but if I put the name with a space like Steve Bruce it will only show the Steve bit.

How would I get it to show the name with a space included?

 

I have added the code to test the booking room and the output I get is null.

That is not right is it?

Here is the testRoom code.

Code:

import java.util.Scanner;
import java.awt.*;
import javax.swing.*;

public class testRoom
{
    public static void main(String[] args)
    {
	   String customerName;
	   Room broom = new Room();
	   
	   do
		{
		String inputString = JOptionPane.showInputDialog(null,"Please Enter The Customers Name");
		Scanner nameScanner = new Scanner(inputString); 
		customerName = nameScanner.nextLine();	
		broom.bookRoom(customerName);
		}
		while (customerName.length() < 3 || customerName.length() > 40);
		
		System.out.println(broom.getCustomer());
		
     }
	 
}

Edit :

I have just changed the bookRoom to

Code:

  public void bookRoom(String customer)
    {
	    this.customer = customer;
	    
	}

It seems easier option I am going to try do the testRoom again.

 

So I have got the Test class done for that bit and a box comes up to enter customers name and the output I get is the customers name plus the rate and the room number

So at the minute I get Steve Bruce 0.00 0

Code:

import java.util.Scanner;
import java.awt.*;
import javax.swing.*;

public class testRoom
{
    public static void main(String[] args)
    {
	   String customerName;
	   Room broom = new Room();
	   
	   do
		{
		String inputString = JOptionPane.showInputDialog(null,"Please Enter The Customers Name");
		Scanner nameScanner = new Scanner(inputString); 
		customerName = nameScanner.nextLine();	
		broom.bookRoom(customerName);
		}
		while (customerName.length() < 3 || customerName.length() > 40);
		
		System.out.println(broom.getCustomer() + " " + broom.getRate() + " " + broom.getRoomNumber());
		
     }
	 
}

So in the test class now do I have to write code to put a customer in a certain room? and how would I go about doing that lol.

 

Thanks, I understand the second bit but don't really get what you mean on the first? which constructor is that is it toString?