Java applet scrollbar

[Thanks for the answers. This comes for you http://www.youtube.com/watch?v=Vo0Cazxj_yc ] This might and should be a very easy question, but i could not find a solution.

I have a java applet, and i want a vertical scrollbar so that i can load thousands of buttons into the applet and use the scrollbar to see buttons down on the applet

.

Buttons are used to select items. if button is pressed, the item is selected.

When i load buttons, all of them are shown on one screen, squeezed together to fit the screen in width and height (~1000px,~1000px). Below code is a portion of my program. Please comment.

    JFrame frame = new JFrame();
    NameClassifier nameClassifier = new NameClassifier();
    JScrollPane scrollPane = new JScrollPane(nameClassifier);
     scrollPane.setVerticalScrollBarPolicy(ScrollPaneConstants.VE开发者_高级运维RTICAL_SCROLLBAR_ALWAYS);
    frame.add(scrollPane);
    frame.getContentPane().add(nameClassifier);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.pack();
    frame.setVisible(true);
    System.out.println("exiting");

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import java.awt.*;
import javax.swing.*;

class ManyButtons {

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                JFrame frame = new JFrame();
                NameClassifier nameClassifier = new NameClassifier();
                JScrollPane scrollPane = new JScrollPane(nameClassifier);
                scrollPane.setVerticalScrollBarPolicy(
                    ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
                frame.add(scrollPane);
                // nameClassifier has already been added to the scroll pane.
                //frame.getContentPane().add(nameClassifier);
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.pack();
                frame.setVisible(true);
                System.out.println("exiting");
            }
        });
    }
}

class NameClassifier extends JPanel {

    NameClassifier() {
        super(new GridLayout(0,10,2,2));
        for (int ii=1; ii<=1000; ii++) {
            add(new JButton("Button " + ii));
        }
    }
}

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I think you want to use a Wrap Layout.

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Don't add anything directly to the frame, so

frame.add(scrollPane);

is wrong.

Add things to the content pane. probably

scrollPane.add(nameClassifier);
frame.getContentPane().add(scrollPane);

btw, that is one pretty gui design. :)