Java tutorial
/* From http://java.sun.com/docs/books/tutorial/index.html */ /* * Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * -Redistribution of source code must retain the above copyright notice, this * list of conditions and the following disclaimer. * * -Redistribution in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * * Neither the name of Sun Microsystems, Inc. or the names of contributors may * be used to endorse or promote products derived from this software without * specific prior written permission. * * 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 MIDROSYSTEMS, INC. ("SUN") * AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE * AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS 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 THIS SOFTWARE, * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. * * You acknowledge that this software is not designed, licensed or intended * for use in the design, construction, operation or maintenance of any * nuclear facility. */ /* * ToolBarDemo2.java is a 1.4 application that relies on having the Java Look * and Feel Graphics Repository (jlfgr-1_0.jar) in the class path. You can * download it from * http://developer.java.sun.com/developer/techDocs/hi/repository/. When running * ToolBarDemo2 from the command line (rather than Java Web Start) put * jlfgr-1_0.jar in the class path using one of the following commands (assuming * jlfgr-1_0.jar is in a subdirectory named jars): * * java -cp .;jars/jlfgr-1_0.jar ToolBarDemo2 [Microsoft Windows] java -cp * .:jars/jlfgr-1_0.jar ToolBarDemo2 [UNIX] * * If that doesn't work, try putting quotation marks around the path: * * java -cp ".;jars/jlfgr-1_0.jar" ToolBarDemo2 [UNIX shell on Win32] */ import java.awt.BorderLayout; import java.awt.Dimension; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.net.URL; import javax.swing.ImageIcon; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JTextArea; import javax.swing.JTextField; import javax.swing.JToolBar; public class ToolBarDemo2 extends JPanel implements ActionListener { protected JTextArea textArea; protected String newline = "\n"; static final private String PREVIOUS = "previous"; static final private String UP = "up"; static final private String NEXT = "next"; static final private String SOMETHING_ELSE = "other"; static final private String TEXT_ENTERED = "text"; public ToolBarDemo2() { super(new BorderLayout()); //Create the toolbar. JToolBar toolBar = new JToolBar("Still draggable"); addButtons(toolBar); toolBar.setFloatable(false); toolBar.setRollover(true); //Create the text area used for output. Request //enough space for 5 rows and 30 columns. textArea = new JTextArea(5, 30); textArea.setEditable(false); JScrollPane scrollPane = new JScrollPane(textArea); //Lay out the main panel. setPreferredSize(new Dimension(450, 130)); add(toolBar, BorderLayout.PAGE_START); add(scrollPane, BorderLayout.CENTER); } protected void addButtons(JToolBar toolBar) { JButton button = null; //first button button = makeNavigationButton("Back24", PREVIOUS, "Back to previous something-or-other", "Previous"); toolBar.add(button); //second button button = makeNavigationButton("Up24", UP, "Up to something-or-other", "Up"); toolBar.add(button); //third button button = makeNavigationButton("Forward24", NEXT, "Forward to something-or-other", "Next"); toolBar.add(button); //separator toolBar.addSeparator(); //fourth button button = new JButton("Another button"); button.setActionCommand(SOMETHING_ELSE); button.setToolTipText("Something else"); button.addActionListener(this); toolBar.add(button); //fifth component is NOT a button! JTextField textField = new JTextField("A text field"); textField.setColumns(10); textField.addActionListener(this); textField.setActionCommand(TEXT_ENTERED); toolBar.add(textField); } protected JButton makeNavigationButton(String imageName, String actionCommand, String toolTipText, String altText) { //Look for the image. String imgLocation = "toolbarButtonGraphics/navigation/" + imageName + ".gif"; URL imageURL = ToolBarDemo2.class.getResource(imgLocation); //Create and initialize the button. JButton button = new JButton(); button.setActionCommand(actionCommand); button.setToolTipText(toolTipText); button.addActionListener(this); if (imageURL != null) { //image found button.setIcon(new ImageIcon(imageURL, altText)); } else { //no image found button.setText(altText); System.err.println("Resource not found: " + imgLocation); } return button; } public void actionPerformed(ActionEvent e) { String cmd = e.getActionCommand(); String description = null; // Handle each button. if (PREVIOUS.equals(cmd)) { //first button clicked description = "taken you to the previous <something>."; } else if (UP.equals(cmd)) { // second button clicked description = "taken you up one level to <something>."; } else if (NEXT.equals(cmd)) { // third button clicked description = "taken you to the next <something>."; } else if (SOMETHING_ELSE.equals(cmd)) { // fourth button clicked description = "done something else."; } else if (TEXT_ENTERED.equals(cmd)) { // text field JTextField tf = (JTextField) e.getSource(); String text = tf.getText(); tf.setText(""); description = "done something with this text: " + newline + " \"" + text + "\""; } displayResult("If this were a real app, it would have " + description); } protected void displayResult(String actionDescription) { textArea.append(actionDescription + newline); textArea.setCaretPosition(textArea.getDocument().getLength()); } /** * Create the GUI and show it. For thread safety, this method should be * invoked from the event-dispatching thread. */ private static void createAndShowGUI() { //Make sure we have nice window decorations. JFrame.setDefaultLookAndFeelDecorated(true); //Create and set up the window. JFrame frame = new JFrame("ToolBarDemo2"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //Create and set up the content pane. ToolBarDemo2 newContentPane = new ToolBarDemo2(); 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(); } }); } }