/* * Swing version */import javax.swing.*;import java.awt.GridBagLayout;import java.awt.GridBagConstraints;import java.awt.Insets;import java.awt.Color;import java.awt.Dimension;import java.awt.event.MouseListener;import java.awt.event.MouseEvent;public class MouseEventDemo extends JApplet                             implements MouseListener {    BlankArea blankArea;    JTextArea textArea;    final static String newline = "\n";    public void init() {        GridBagLayout gridbag = new GridBagLayout();        GridBagConstraints c = new GridBagConstraints();        JPanel contentPane = new JPanel();        contentPane.setLayout(gridbag);        c.fill = GridBagConstraints.BOTH;        c.gridwidth = GridBagConstraints.REMAINDER;        c.weightx = 1.0;        c.weighty = 1.0;        c.insets = new Insets(1, 1, 1, 1);        blankArea = new BlankArea(new Color(0.98f, 0.97f, 0.85f));        gridbag.setConstraints(blankArea, c);        contentPane.add(blankArea);        c.insets = new Insets(0, 0, 0, 0);        textArea = new JTextArea();        textArea.setEditable(false);        JScrollPane scrollPane = new JScrollPane(textArea);        scrollPane.setVerticalScrollBarPolicy(                JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);        scrollPane.setPreferredSize(new Dimension(200, 75));        gridbag.setConstraints(scrollPane, c);        contentPane.add(scrollPane);        //Register for mouse events on blankArea and applet.        blankArea.addMouseListener(this);        addMouseListener(this);        setContentPane(contentPane);    }    public void mousePressed(MouseEvent e) {       saySomething("Mouse pressed (# of clicks: "                    + e.getClickCount() + ")", e);    }    public void mouseReleased(MouseEvent e) {       saySomething("Mouse released (# of clicks: "                    + e.getClickCount() + ")", e);    }    public void mouseEntered(MouseEvent e) {       saySomething("Mouse entered", e);    }    public void mouseExited(MouseEvent e) {       saySomething("Mouse exited", e);    }    public void mouseClicked(MouseEvent e) {       saySomething("Mouse clicked (# of clicks: "                    + e.getClickCount() + ")", e);    }    void saySomething(String eventDescription, MouseEvent e) {        textArea.append(eventDescription + " detected on "                        + e.getComponent().getClass().getName()                        + "." + newline);    }}