TextArea components

[Ian Cockcroft]

Hi All,
I am trying to get a GUI with 2 TextArea's, one above the other. It compiles fine, but I am getting this error when i run it:
java.lang.IllegalArgumentException: adding a window to a container
at java.awt.Container.addImpl(Container.java:336)
at javax.swing.JLayeredPane.addImpl
(JLayeredPane.java:201)
at java.awt.Container.add(Container.java:267)
at javax.swing.JRootPane.setContentPane
(JRootPane.java:358)
at javax.swing.JFrame.setContentPane
(JFrame.java:550)
at StreamGUI.main(StreamGUI.java:52)

The Code

import java.awt.Color;
import java.awt.TextArea;
import java.awt.BorderLayout;
import java.awt.event.*;
import javax.swing.*;
class StreamGUI extends JFrame
{
JTextArea txtArea1;
JTextArea txtArea2;
JPanel panel;

publicStreamGUI() 
{

JTextArea txtArea1 = new 
                  + JTextArea("top text area");
JTextArea txtArea2 = new 
                  + JTextArea("bottom text area");
//create panel
panel = new JPanel();
//specify layout manager and 
                      background
panel.setLayout(new BorderLayout
                        + (1,1));
panel.setBackground(Color.white);
//add label and buttons to panel
getContentPane().add(panel);
panel.add(BorderLayout.NORTH, 
                    + txtArea1);
panel.add(BorderLayout.SOUTH, 
                     + txtArea2);

}

public static void main (String args[])
{
//create top level frame
StreamGUI frame = new StreamGUI();
frame.setTitle("File Monitor");

//code to close window
WindowListener l = new 
                     +WindowAdapter()
{
public void windowClosing
                           + (WindowEvent e)
{
System.exit(0);
}
};

frame.addWindowListener(l);
//code to let u see frame
frame.setContentPane
                   + (new StreamGUI());
frame.pack();
frame.setVisible(true);
}



}  

Any Ideas?
Thanks
Ian

[Jeff Smith]

It's the line where you say:
frame.setContentPane( new StreamGUI() );
Your StreamGUI class is a frame itself, so you should use it as a one. You don't need to call setContentPane() because the content's were already set in it's constructor. As for the error, it's because you're trying to add a JFrame to a JFrame, you can only add a Container as the contents of a JFrame.
Jeff
[ April 14, 2002: Message edited by: Jeff Smith ]