Question

I am new to java and having an issue when trying to add a single element into a structure type array. I have my array setup as so: public apartment availableRoom[] = new apartment[1]; My main calls a method that initializes this as soon as the application launches:

availableRoom[0] = new apartment(150, 2, 200.00,null);
//this sets default values for room#, beds, price, and guest

My constructor takes the info like so

public apartment(int roomNum, int beds, double price, String guest )
    { 
        this.roomNumber = roomNum;
        this.roomBeds = beds;
        this.nightlyFee = price;
        this.roomGuest = guest;
    }

Where I am having issues is when I am trying to assign a guest to the room. I am trying it with availableRoom[i].roomGuest = name Name is entered by the user and i is set to 0 (I checked). No errors but when I go to print the information for the room it returns every value as 0 and the guest to null. Can anyone see what I am doing wrong? (FYI Apartment is a separate class from main)

Main

public class apartmentMain {


    static apartment action = new apartment();



    public static void main(String[] args) {

        action.createApt();
        action.addGuest();

apartment.java

public void createApt()
    {
       availableRoom[0] = new apartment(150, 2, 200.00,null);
}

public void addGuest()
{

    name = input.next();
    availableRoom[i].roomGuest = name;

}

Answer 1

well, as you say

No errors but when I go to print the information for the room it returns every value as 0 and the guest to null.

I think , you are setting values in diffrent object and printing different one. If you just paste how you are printing its values it may help a lot.

Things to Consider

1. Since you are getting default values(that instance variables get if you don’t assign any), that means an actual object is there in your array, that is instantiated but not initialized.
2. Take a close look which object you are printing and which one you are setting values in.
3. It is quite possible that at the first index, a newly instantiated object is inserted somehow that replaced the original one.
4. you are printing a different object than the original one ….a possibility.
5. You may want to get rid of the “no argument constructor” to better get actual seen of the problem. Try it..its worth.