Java JFrame and another class interaction
===

I've found the [similar question][1], but it's still be unclear for me.

So, I have a main class ProcessorCalculations(), from which I call MainFrame() class. In MainFrame class user should choose the folder. How I can transmit the JFileChooser() object from MainFrame() to ProcessorCalculations()?

I've tried to implement the hint from the link above:

       ProcessorCalculation processor = new ProcessorCalculation();
       MainFrame mainFrame = new MainFrame(processor);
But I don't know how to call `processor` methods from `mainFrame` without creating new objects.
Even I dont't know the correct question I should ask Google.
Help please.

  [1]: http://stackoverflow.com/questions/10393954/java-with-jframe-and-class-interaction