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JLayeredPaneのサンプル。
JAppletの上にダイアログに見立てたボタンを表示する。

/*

 * Created on 2006/01/27

 *

 */

package test;
import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.MouseAdapter;

import java.awt.event.MouseEvent;
import javax.swing.BorderFactory;

import javax.swing.JApplet;

import javax.swing.JButton;

import javax.swing.JLayeredPane;
/**

 * @author hal

 *

 */

public class LayeredPaneApplet extends JApplet {

    private JLayeredPane layeredPane;

    private JButton pushMe;

    private JButton messageDialog;

    

    public void init() {

        final int dialogWidth = 140;

        final int dialogHeight = 140;

        layeredPane = getLayeredPane();

        pushMe = new JButton("Push me!");

        pushMe.setOpaque(true);

        messageDialog = new JButton("Hello");

        messageDialog.setOpaque(true);

        messageDialog.setBorder(BorderFactory.createRaisedBevelBorder());

        messageDialog.setBounds(0, 0, dialogWidth, dialogHeight);

        messageDialog.setVisible(false);

        messageDialog.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent action) {

                messageDialog.setVisible(false);

            }

        });

        layeredPane.add(messageDialog, JLayeredPane.DEFAULT_LAYER);

//        pushMe.addActionListener(new ActionListener() {

//            public void actionPerformed(ActionEvent e) {

//                int x = (getWidth() - dialogWidth) / 2;

//                int y = (getHeight() - dialogHeight) / 2;

//                messageDialog.setLocation(x, y);

//                messageDialog.setVisible(true);

//            }

//        });

        pushMe.addMouseListener(new MouseAdapter() {

            public void mouseClicked(MouseEvent mouse) {

                int x = mouse.getX();

                int y = mouse.getY();

                x -= (dialogWidth / 2);

                y -= (dialogWidth / 2);

                messageDialog.setLocation(x, y);

                messageDialog.setVisible(true);

            }

        });

        getContentPane().add(pushMe);

        setSize(400, 300);

    }

}