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Editorial Team
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Asked: 2026-05-28T04:42:31+00:00

I have a class which extends JFrame and forms the GUI of my program.

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I have a class which extends JFrame and forms the GUI of my program. I want to use the GUI for two main purposes:

  1. I want the user to be able to input values to the program.
  2. I want the GUI to display values created by my program.

Considering my class has a lot of GUI elements, the source file is already rather large and It does not seem like good practice to bundle all the program code in with the GUI code. I’m wondering what is the best way to structure my code? I believe there is an issue where requirement 1 creates a dependency from the GUI to the program code, and the second requirement does the opposite.

So, I want one class for my GUI which contains all my GUI related tasks. I then want another class for my program logic. I should then be able to call methods from the program logic class from the GUI and vice versa.

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1 Answer

  1. Editorial Team

    Sounds like you are looking for a textbook MVC (Model-View-Controller) design pattern. I recommend you google “MVC Design Pattern” for summaries and use cases. That being said, you might want to put your program logic into a “Singleton” class (again, google “Singleton Design Pattern”). A properly implemented Singleton should be accessible from any other class in your code.

    Consider also a third middle class which acts solely for data storage, you put values into it for storage, and you fetch values from it for work. This now creates 3 clear segments for your code, the Data (the Model), the GUI (the View), and the logic (the Controller). Voila, you’ve just implemented the MVC (Model-View-Controller) design pattern…

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