JButton to run new class (with main)

Hi all,
I hope someone out there can help me with this.
Class1 = GUI_1:
I have written a program(GUI) that takes in user input (JTextArea) and saves it to a file. The program then performs a few functions on this text file and spits out the resulting text file.
Class2 = PLOTTER:
I have a seperate class I have written that takes this resulting text file and plots the output of the file on a graph.
The problem is that I have a JButton on the GUI_1 that calls the PLOTTER class in the following way when the mouse is clicked :
private void jButton3MouseClicked(java.awt.event.MouseEvent evt) {
        LineChart lc = new LineChart("");
    }The problem is that I only get console output and not the actual plotted data i.e. the GUI_1 doesn't draw the plotted data. Both Classes are main()'s.
The Plotter class runs fine on its own i.e. it plots data fine.
Sorry if it's a bit confusing, writing this at 2am zzzzzzzzz
regards,
Seany

Thanks, I got it sorted now.
Why should I use ActionListener instead of MouseListener ?
The event handling code was automatically generated by NetBeans...
regards,
Se�n.

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