Why is my Map broken?
- by Kirk
Scenario: Creating a server which has Room objects which contain User objects.
I want to store the rooms in a Map of some sort by Id (a string).
Desired Behavior:
When a user makes a request via the server, I should be able to look up the Room by id from the library and then add the user to the room, if that's what the request needs.
Currently I use the static function in my Library.java class where the Map is stored to retrieve Rooms:
public class Library {
private static Hashtable<String, Rooms> myRooms = new Hashtable<String, Rooms>();
public static addRoom(String s, Room r) {
myRooms.put(s, r);
}
public static Room getRoomById(String s) {
return myRooms.get(s);
}
}
In another class I'll do the equivalent of myRoom.addUser(user);
What I'm observing using Hashtable, is that no matter how many times I add a user to the Room returned by getRoomById, the user is not in the room later.
I thought that in Java, the object that was returned was essentially a reference to the data, the same object that was in the Hashtable with the same references; but, it isn't behaving like that. Is there a way to get this behavior? Maybe with a wrapper of some sort? Am I just using the wrong variant of map?
Help?
