Problem with reusing the JScrollPane again for different custom Lists

Question

I am trying to create a JScrollPane component which can be reused depending upon the string parameter that is being passed.. I have created the following code, it works if I

Answer 1

public class ListComponent extends JScrollPane

What? You should not be extending a JScrollPane. You are not adding new functionality to the scroll pane.

If you are trying to add a JList to a JScrollPane, then I suggest you read the JList API and follow the link to the Swing tutorial on "How to Use Lists" for a working example.