switching between different JPanels when pressing buttons

[Dieter Merlin]

I have a problem when trying to switch to a different JPanel when you press another button on a toolbar.

The panel does not show up until I resize the window or let a JTextArea appear instead of a JPanel.
More specifically: the btnStakes currently places a JTextArea in BorderLayout.CENTER, wich works right away.
The btnContacts places my own JPanel in the center but when I press that button before I do anything else, nothign comes up.
If I resize my screen, or press the btnStakes first and then the btnContacts button, the panel does show up.
Does anyone know a good way of dynammically adding/removing panels to a layout with proper refreshing/redrawing?

I currently have the following code:
My panel:

  
public class KlantenOverzichtFrame extends JPanel {
private JTable klantenTabel;

public KlantenOverzichtFrame() {
super(new BorderLayout());
JPanel panel = new JPanel(new GridLayout(1,1));
KlantenTabelModel model = new KlantenTabelModel();
TableSorter sorter = new TableSorter();
sorter.setTableModel(model);
klantenTabel = new JTable(sorter);
sorter.setTableHeader(klantenTabel.getTableHeader());
 
        //Set up tool tips for column headers.
klantenTabel.getTableHeader().setToolTipText(Tokens.getProperty("label.sort"));
 
        //Create the scroll pane and add the table to it.
        JScrollPane scrollPane = new JScrollPane(klantenTabel);
 
        //Add the scroll pane to this panel.
panel.add(scrollPane);
add(panel, BorderLayout.CENTER);
add(new JButton("test"), BorderLayout.SOUTH);
}
}  

The main screen where the toolbar and the panel should come:

  
public class MainScreen extends JFrame implements ActionListener {
private ToolBarButton btnStakes;
private ToolBarButton btnContacts;
private JTextArea text = new JTextArea();
private KlantenOverzichtFrame klanten = new KlantenOverzichtFrame();

public MainScreen(String title) {
super(title);
setSize(800,600);
getContentPane().setLayout(new BorderLayout());
JFrame.setDefaultLookAndFeelDecorated(true);
setLocationRelativeTo(null);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setupMenu(); // works fine
setupLeftMenu(); // toolbar, also works fine
setVisible(true);
} 
        public void actionPerformed(ActionEvent event) {
if (event.getSource() instanceof ToolBarButton) {
                // it definitly gets in here, its just a matter of layout
if (event.getSource() == btnStakes) {
klanten.setVisible(false);
getContentPane().add(text, BorderLayout.CENTER);
getContentPane().doLayout();
setSize(800,600);
text.setVisible(true);
}

if (event.getSource() == btnContacts) {
text.setVisible(false);
getContentPane().add(klanten, BorderLayout.CENTER);
getContentPane().doLayout();
setSize(800,600);
klanten.setVisible(true);
}
}
}
 

[Craig Wood]

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.DefaultTableModel;
import javax.swing.text.Document;
 
public class MS extends JFrame implements ActionListener {
    private JButton btnStakes;
    private JButton btnContacts;
    private JTextArea text = new JTextArea("hello world");
    private KlantenOverzichtFrame klanten = new KlantenOverzichtFrame();
 
    public MS(String title) {
        super(title);
        btnStakes = new JButton("stakes");
        btnContacts = new JButton("contacts");
        btnStakes.addActionListener(this);
        btnContacts.addActionListener(this);
        text.setFont(text.getFont().deriveFont(28f));
        getContentPane().add(btnStakes, "North");
        getContentPane().add(btnContacts, "South");
        setSize(800,600);
        setLocationRelativeTo(null);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setVisible(true);
    }
 
    public void actionPerformed(ActionEvent event) {
        if (event.getSource() == btnStakes) {
            getContentPane().remove(klanten);
            getContentPane().add(text, BorderLayout.CENTER);
            text.setCaretPosition(text.getDocument().getLength());
            text.requestFocusInWindow();
        }
 
        if (event.getSource() == btnContacts) {
            getContentPane().remove(text);
            getContentPane().add(klanten, BorderLayout.CENTER);
        }
 
        //((JComponent)getContentPane()).revalidate();
        getContentPane().validate();
        getContentPane().repaint();
    }
 
    public static void main(String[] args) {
        JFrame.setDefaultLookAndFeelDecorated(true);
        new MS("MS");
    }
}
 
class KlantenOverzichtFrame extends JPanel {
    private JTable klantenTabel;
 
    public KlantenOverzichtFrame() {
        super(new BorderLayout());
        String[] colNames = { "column 1", "column 2", "column 3" };
        int rows = 16, cols = 3;
        Object[][] data = new Object[rows][cols];
        for(int row = 0; row < rows; row++)
            for(int col = 0; col < cols; col++)
                data[row][col] = "item " + (row*cols + col+1);
        DefaultTableModel model = new DefaultTableModel(data, colNames);
        klantenTabel = new JTable(model);
 
        //Create the scroll pane and add the table to it.
        JScrollPane scrollPane = new JScrollPane(klantenTabel);
 
        //Add the scroll pane to this panel.
        add(scrollPane, BorderLayout.CENTER);
        add(new JButton("test"), BorderLayout.SOUTH);
    }
}

CardLayout and JTabbedPane are options that may suit your needs.

[Dieter Merlin]

Thank you very much
this works great!
And yes, I was planning to use the JTabbedPane in my program, but it was intended for one of the inner JPanels, and I had to keep things a bit user-friendly