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Thanks guys.
I got it right at the end.
My ReadDirectory Class

import java.awt.*;
import javax.swing.*;

public class ReadDirectory extends JPanel{
String s;
public...

Why do you create an empty ReadDirectory in the ReadDirectory(String) constructor? You should be painting that supplied String.
I have this "idea" that paint() is been called from constructor with...

Thanks for pointing to the right direction.
Actually I now got an:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException: String is null
at...

Looks like I forgotten to change the String f on the Start class; instead of private String f; is static String f;.
Also I WANT to create multiple JFrames...maybe haven't explain clearly what I...

Hi, and happy new year.
I have this problem with my java learning.
I want to create a GUI application which will read files on a directory and display they're names in the JFrame title and in a...