Question

This is a little weird question, I have a GUI class that in the constructor initiates a Logic class that takes care of the processing of the Processing or Logistics in the App then their is a Handler class that contains a bunch of ActionListners KeyListeners that are attached to UI components in the GUI class

In Constructor of both the Logic and Handler class I take in as parameter the GUI class to be able to manipulate the GUI components created in the GUI class from both the Logic and Handler classes

My problem is that The Handler makes use of the Logic class and vise versa (the Logic class uses the Handler class) and thats not really possible with the method I described above, one is instance before the other, one will be null when attempting to use the other.

Example:

public class GUI() 
{
    this.handler = new Handler(this);
    this.logic = new Logic(this);
}

If handler tries to use something in logic then null would be returned.

One way to fix this is to a setter for the handler to take the logic and vise versa but that doesn’t seem like the answer to this.

Answer 1

simple:

public class GUI() 
{
    this.handler = new Handler(this);
    this.logic = new Logic(this);
    handler.setLogic(logic);
    logic.setHandler(handler);
}