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Asked: 2026-05-16T23:47:30+00:00

I am trying to understand how the following code ties into two other .java

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I am trying to understand how the following code ties into two other .java files that are in the package template. In the main method are three class being instantiated? Why put them in the main method if everything is in the package template? Will these all have Driver class as a superclass? And finally are any of the words in the three classes that are being instantiated java specific words with the exception of the work “new”. Thanks for any insight into this. I am trying to understand how a project fits together so that I can write a recursive algorithm to search files. Thank you
One more question I want to make sure that I understand is why is gui in the parameter for DirectoryLister….DirectoryLister(gui);??? Does it need to be there in the main class so that it can call methods from gui??

package template;

import javax.swing.*;

public class Driver
{
  public static void main(String[] args)
   {
       GUI gui = new GUI();
       DirectoryLister dl = new DirectoryLister(gui);
       gui.registerModel(dl);
   }
}
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1 Answer

  1. Editorial Team

    Lot of questions:

    • In the main method are three class being instantiated?

    No, only two are explicitly instantiated: GUI and DirectoryLister.

    • Why put them in the main method if everything is in the package template?

    main method is just the entry point for your program. You may or may not put everything inside main method. Just keep in mind that that’s where your program will start executing.

    • Will these all have Driver class as a superclass?

    If you are referring to GUI and DirectoryLister then the answer is NO. Not at all. They’re completely independent.

    • Are any of the words in the three classes that are being instantiated Java specific words with the exception of the work “new”?

    No. None of them.

    • I want to make sure that I understand is why is gui in the parameter for DirectoryLister….DirectoryLister(gui);??? Does it need to be there in the main class so that it can call methods from gui??

    DirectoryLister probably expects a GUI instance in one of its constructors. You are building your dl object with gui element by calling DirectoryLister(GUI g) constructor.

    —

    Also, keep in mind that your question is not related to JavaME as you tagged it. It’s just a plain Java question. You won’t be using JavaME here since you are importing javax.swing.* which is not available for JavaME edition.

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