Adding buttons into a scolling pane

Question

Hi
I'm trying to create a class that allows for the adding of button to a scrolling pane.
Here is my code so far
public class Menu extends JPanel
     JButton a = new JButton("sdsd");
     JButton b = new JButton("sdssd");
     Menu()
          JScrollPane as = new JScrollPane();
          as.setPreferredSize(new Dimension(150,150));
          a.setPreferredSize(new Dimension(15,15));
          as.add(a);
          as.add(b);
          add(as);
}However all i get is a rectangle so I'm doing something wrong.
Can anyone offer any help as to why it's not working?
thanks

Answer 1

something like this:
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.SwingUtilities;
public class BtnScrollPaneTest extends JPanel
    private JButton buttonA = new JButton("Button A");
    private JButton buttonB = new JButton("Button B");
    public BtnScrollPaneTest()
        setPreferredSize(new Dimension(150, 150));
        setLayout(new BorderLayout());
        JScrollPane scrollPane = new JScrollPane();
        JPanel viewportPane = new JPanel(new GridLayout(0, 1, 5, 5));
        viewportPane.setPreferredSize(new Dimension(100, 300));
        JPanel buttonPanel1 = new JPanel();
        buttonPanel1.add(buttonA);
        viewportPane.add(buttonPanel1);
        JPanel buttonPanel2 = new JPanel();
        buttonPanel2.add(buttonB);
        viewportPane.add(buttonPanel2);
        scrollPane.getViewport().add(viewportPane);
        add(scrollPane, BorderLayout.CENTER);
    private static void createAndShowGUI()
        JFrame frame = new JFrame("SwingFoo2 Application");
        frame.getContentPane().add(new BtnScrollPaneTest());
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    public static void main(String[] args)
        SwingUtilities.invokeLater(new Runnable()
            public void run()
                createAndShowGUI();
}