Send text to text area in GUI

Hi all,

I am looking to print text to a textarea within a scrollableTextArea in my GUI how could I do this from another class ?

GUI Class
____________________________________________________________

import java.awt.*;
import javax.swing.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

public abstract class GUI extends JFrame implements ActionListener
{
     /**
     * Create the GUI and show it.  For thread safety,
     * this method should be invoked from the
     * event-dispatching thread.
     */
   
    private Rooms currentRoom;
   
        public static void createAndShowGUI() {
        //Make sure we have nice window decorations.
        JFrame.setDefaultLookAndFeelDecorated(false);
       
        //Create and set up the window.
        JFrame frame = new JFrame("World Of Steve");
        frame.setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);
     
        //Create panel to house objects.
        JPanel panel = new JPanel(null);
       
        //Add buttons to GUI
        JButton N = new JButton("North");
        JButton S = new JButton("South");
        JButton E = new JButton("East");
        JButton W = new JButton("West");
       
        //Set button locations x,y,w,h
        N.setBounds(150, 10, 70, 20);
        S.setBounds(150, 140, 70, 20);
        E.setBounds(170, 120, 70, 20);
        W.setBounds(10, 120, 70, 20);
       
        //Add labels to GUI
        JLabel lblLocationCaption    = new JLabel("Current Location is: ");
        JLabel lblCurrentLocation   = new JLabel();
        JLabel lblExits   = new JLabel("Exits;");
       
        //Add Main Text Area
        JTextArea textArea = new JTextArea();
        JScrollPane scrollableTextArea = new JScrollPane(textArea);
       
        //Set textarea location
        scrollableTextArea.setBounds(160, 30, 380, 400);
       
        //Set label locations x,y,w,h
        lblLocationCaption.setBounds(5, 5, 150, 20);
        lblCurrentLocation.setBounds(155, 5, 150, 20);
        lblExits.setBounds(5, 30, 50, 20);
       
        //Add objects to panel to display in frame
        panel.add(N);
        panel.add(S);
        panel.add(E);
        panel.add(W);
        panel.add(lblLocationCaption);
        panel.add(lblCurrentLocation);
        panel.add(lblExits);
        panel.add(scrollableTextArea);
        frame.getContentPane().add(panel);

        //Display the window.
        int width = 700;
        int height = 500;
        frame.setSize(width, height);
        frame.show();
        frame.setVisible(true);
    }
   
        // Create an action
        Action N = new AbstractAction("North") {
        // This method is called when the button is pressed
        public void actionPerformed(ActionEvent evt) {
            System.out.println("North hs been pressed via GUI");
        }
    };
   
}


Many Thanks
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