Java tutorial
/* * * Copyright (c) 1998 Sun Microsystems, Inc. All Rights Reserved. * * Sun grants you ("Licensee") a non-exclusive, royalty free, license to use, * modify and redistribute this software in source and binary code form, * provided that i) this copyright notice and license appear on all copies of * the software; and ii) Licensee does not utilize the software in a manner * which is disparaging to Sun. * * This software is provided "AS IS," without a warranty of any kind. ALL * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY * IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR * NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE * LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING * OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS * LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, * INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER * CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF * OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE * POSSIBILITY OF SUCH DAMAGES. * * This software is not designed or intended for use in on-line control of * aircraft, air traffic, aircraft navigation or aircraft communications; or in * the design, construction, operation or maintenance of any nuclear * facility. Licensee represents and warrants that it will not use or * redistribute the Software for such purposes. */ import java.awt.Component; import java.awt.Dimension; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.KeyEvent; import javax.swing.BorderFactory; import javax.swing.Box; import javax.swing.BoxLayout; import javax.swing.JButton; import javax.swing.JComponent; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JTextArea; import javax.swing.SwingConstants; /* HtmlDemo.java needs no other files. */ public class HtmlDemo extends JPanel implements ActionListener { JLabel theLabel; JTextArea htmlTextArea; public HtmlDemo() { setLayout(new BoxLayout(this, BoxLayout.LINE_AXIS)); String initialText = "<html>\n" + "Color and font test:\n" + "<ul>\n" + "<li><font color=red>red</font>\n" + "<li><font color=blue>blue</font>\n" + "<li><font color=green>green</font>\n" + "<li><font size=-2>small</font>\n" + "<li><font size=+2>large</font>\n" + "<li><i>italic</i>\n" + "<li><b>bold</b>\n" + "</ul>\n"; htmlTextArea = new JTextArea(10, 20); htmlTextArea.setText(initialText); JScrollPane scrollPane = new JScrollPane(htmlTextArea); JButton changeTheLabel = new JButton("Change the label"); changeTheLabel.setMnemonic(KeyEvent.VK_C); changeTheLabel.setAlignmentX(Component.CENTER_ALIGNMENT); changeTheLabel.addActionListener(this); theLabel = new JLabel(initialText) { public Dimension getPreferredSize() { return new Dimension(200, 200); } public Dimension getMinimumSize() { return new Dimension(200, 200); } public Dimension getMaximumSize() { return new Dimension(200, 200); } }; theLabel.setVerticalAlignment(SwingConstants.CENTER); theLabel.setHorizontalAlignment(SwingConstants.CENTER); JPanel leftPanel = new JPanel(); leftPanel.setLayout(new BoxLayout(leftPanel, BoxLayout.PAGE_AXIS)); leftPanel.setBorder(BorderFactory.createCompoundBorder( BorderFactory.createTitledBorder("Edit the HTML, then click the button"), BorderFactory.createEmptyBorder(10, 10, 10, 10))); leftPanel.add(scrollPane); leftPanel.add(Box.createRigidArea(new Dimension(0, 10))); leftPanel.add(changeTheLabel); JPanel rightPanel = new JPanel(); rightPanel.setLayout(new BoxLayout(rightPanel, BoxLayout.PAGE_AXIS)); rightPanel .setBorder(BorderFactory.createCompoundBorder(BorderFactory.createTitledBorder("A label with HTML"), BorderFactory.createEmptyBorder(10, 10, 10, 10))); rightPanel.add(theLabel); setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10)); add(leftPanel); add(Box.createRigidArea(new Dimension(10, 0))); add(rightPanel); } // React to the user pushing the Change button. public void actionPerformed(ActionEvent e) { theLabel.setText(htmlTextArea.getText()); } /** * Create the GUI and show it. For thread safety, this method should be * invoked from the event-dispatching thread. */ private static void createAndShowGUI() { // Create and set up the window. JFrame frame = new JFrame("HtmlDemo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // Create and set up the content pane. JComponent newContentPane = new HtmlDemo(); newContentPane.setOpaque(true); // content panes must be opaque frame.setContentPane(newContentPane); // Display the window. frame.pack(); frame.setVisible(true); } public static void main(String[] args) { // Schedule a job for the event-dispatching thread: // creating and showing this application's GUI. javax.swing.SwingUtilities.invokeLater(new Runnable() { public void run() { createAndShowGUI(); } }); } }