EPORTFOLIO

Select a library from the Java run-time library (math, network, …) and briefly discuss the routines the library provides. Ideally, post a simple example showing the library’s use.

1. 
   Ryan Bridglal said...
   10:15 pm - April 5th, 2009

   Originally Posted: 11 Mar 09 4:19 PM MST

   I would like to talk about Java.Awt and Java.Swing; Java’s windowing, toolkit libraries. These libraries contain the interfaces to create and manipulate a GUI-window based application.

   A little **NOTE** about the IDEs.
   The following code was pre-generated with the NETBEANS 6.5 IDE. It’s a waste of time to manually code in a Window frame, that could take a beginner programmer about 5 or 10 minutes. Especially to debug the the code; ensuring a smooth operation. The simplest way to generate the GUI code is to use the IDE, File, New Project, GUI application. Using the IDE only took a few seconds to generate the BUG free code; Time saved right there.

   java.awt = contains classes for GUI applications.

   java.awt.event = provides classes to handle and work with events with awt components.

   java.awt.event.ActionListener = receives the action events with components.

   javax.swing = a set of light gui based components.

   javax.swing.Icon = implements the use and manipulation of icons.

   javax.swing.JDialog = used in dialog windows, the about box.

   javax.swing.JFrame = adds support for frames with Swing component architecture.

   import javax.swing.Timer = calls a timer and objects with actions listener for intervals, You can show an animation many times per second.

   org.jdesktop.application = Used with swing components. You’ll see references to Action, Frame, Resources and Task monitor.

   These are critical in the graphical Java world we live in. To create a basic java window With a File Menu and Window Frame. You can use the following code….

   ::code:::

   /* @author Ryan Bridglal, RyanJB.com
   * UAT, CSC203-D09FEB05.
   * Basic GUI Application with Window, file menu, about box, progress bar
   * and the command to display the progress bas and exit the program.
   */
   package desktopapplication1;

   import org.jdesktop.application.Action;
   import org.jdesktop.application.ResourceMap;
   import org.jdesktop.application.SingleFrameApplication;
   import org.jdesktop.application.FrameView;
   import org.jdesktop.application.TaskMonitor;
   import java.awt.event.ActionEvent;
   import java.awt.event.ActionListener;
   import javax.swing.Timer;
   import javax.swing.Icon;
   import javax.swing.JDialog;
   import javax.swing.JFrame;

   /**
   * The application’s main frame.
   */
   public class DesktopApplication1View extends FrameView {

   public DesktopApplication1View(SingleFrameApplication app) {
   super(app);

   initComponents();

   // status bar initialization - message timeout, idle icon and busy animation, etc
   ResourceMap resourceMap = getResourceMap();
   int messageTimeout = resourceMap.getInteger(”StatusBar.messageTimeout”);
   messageTimer = new Timer(messageTimeout, new ActionListener() {
   public void actionPerformed(ActionEvent e) {
   statusMessageLabel.setText(”");
   }
   });
   messageTimer.setRepeats(false);
   int busyAnimationRate = resourceMap.getInteger(”StatusBar.busyAnimationRate”);
   for (int i = 0; i < busyIcons.length; i++) {
   busyIcons[i] = resourceMap.getIcon("StatusBar.busyIcons[" + i + "]");
   }
   busyIconTimer = new Timer(busyAnimationRate, new ActionListener() {
   public void actionPerformed(ActionEvent e) {
   busyIconIndex = (busyIconIndex + 1) % busyIcons.length;
   statusAnimationLabel.setIcon(busyIcons[busyIconIndex]);
   }
   });
   idleIcon = resourceMap.getIcon("StatusBar.idleIcon");
   statusAnimationLabel.setIcon(idleIcon);
   progressBar.setVisible(false);

   // connecting action tasks to status bar via TaskMonitor
   TaskMonitor taskMonitor = new TaskMonitor(getApplication().getContext());
   taskMonitor.addPropertyChangeListener(new java.beans.PropertyChangeListener() {
   public void propertyChange(java.beans.PropertyChangeEvent evt) {
   String propertyName = evt.getPropertyName();
   if ("started".equals(propertyName)) {
   if (!busyIconTimer.isRunning()) {
   statusAnimationLabel.setIcon(busyIcons[0]);
   busyIconIndex = 0;
   busyIconTimer.start();
   }
   progressBar.setVisible(true);
   progressBar.setIndeterminate(true);
   } else if ("done".equals(propertyName)) {
   busyIconTimer.stop();
   statusAnimationLabel.setIcon(idleIcon);
   progressBar.setVisible(false);
   progressBar.setValue(0);
   } else if ("message".equals(propertyName)) {
   String text = (String)(evt.getNewValue());
   statusMessageLabel.setText((text == null) ? "" : text);
   messageTimer.restart();
   } else if ("progress".equals(propertyName)) {
   int value = (Integer)(evt.getNewValue());
   progressBar.setVisible(true);
   progressBar.setIndeterminate(false);
   progressBar.setValue(value);
   }
   }
   });
   }

   @Action
   public void showAboutBox() {
   if (aboutBox == null) {
   JFrame mainFrame = DesktopApplication1.getApplication().getMainFrame();
   aboutBox = new DesktopApplication1AboutBox(mainFrame);
   aboutBox.setLocationRelativeTo(mainFrame);
   }
   DesktopApplication1.getApplication().show(aboutBox);
   }

   /** This method is called from within the constructor to
   * initialize the form.
   */
   @SuppressWarnings("unchecked")
   //
   private void initComponents() {

   mainPanel = new javax.swing.JPanel();
   menuBar = new javax.swing.JMenuBar();
   javax.swing.JMenu fileMenu = new javax.swing.JMenu();
   javax.swing.JMenuItem exitMenuItem = new javax.swing.JMenuItem();
   javax.swing.JMenu helpMenu = new javax.swing.JMenu();
   javax.swing.JMenuItem aboutMenuItem = new javax.swing.JMenuItem();
   statusPanel = new javax.swing.JPanel();
   javax.swing.JSeparator statusPanelSeparator = new javax.swing.JSeparator();
   statusMessageLabel = new javax.swing.JLabel();
   statusAnimationLabel = new javax.swing.JLabel();
   progressBar = new javax.swing.JProgressBar();

   mainPanel.setName(”mainPanel”); // NOI18N

   javax.swing.GroupLayout mainPanelLayout = new javax.swing.GroupLayout(mainPanel);
   mainPanel.setLayout(mainPanelLayout);
   mainPanelLayout.setHorizontalGroup(
   mainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
   .addGap(0, 400, Short.MAX_VALUE)
   );
   mainPanelLayout.setVerticalGroup(
   mainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
   .addGap(0, 254, Short.MAX_VALUE)
   );

   menuBar.setName(”menuBar”); // NOI18N

   org.jdesktop.application.ResourceMap resourceMap = org.jdesktop.application.Application.getInstance(desktopapplication1.DesktopApplication1.class).getContext().getResourceMap(DesktopApplication1View.class);
   fileMenu.setText(resourceMap.getString(”fileMenu.text”)); // NOI18N
   fileMenu.setName(”fileMenu”); // NOI18N

   javax.swing.ActionMap actionMap = org.jdesktop.application.Application.getInstance(desktopapplication1.DesktopApplication1.class).getContext().getActionMap(DesktopApplication1View.class, this);
   exitMenuItem.setAction(actionMap.get(”quit”)); // NOI18N
   exitMenuItem.setName(”exitMenuItem”); // NOI18N
   fileMenu.add(exitMenuItem);

   menuBar.add(fileMenu);

   helpMenu.setText(resourceMap.getString(”helpMenu.text”)); // NOI18N
   helpMenu.setName(”helpMenu”); // NOI18N

   aboutMenuItem.setAction(actionMap.get(”showAboutBox”)); // NOI18N
   aboutMenuItem.setName(”aboutMenuItem”); // NOI18N
   helpMenu.add(aboutMenuItem);

   menuBar.add(helpMenu);

   statusPanel.setName(”statusPanel”); // NOI18N

   statusPanelSeparator.setName(”statusPanelSeparator”); // NOI18N

   statusMessageLabel.setName(”statusMessageLabel”); // NOI18N

   statusAnimationLabel.setHorizontalAlignment(javax.swing.SwingConstants.LEFT);
   statusAnimationLabel.setName(”statusAnimationLabel”); // NOI18N

   progressBar.setName(”progressBar”); // NOI18N

   javax.swing.GroupLayout statusPanelLayout = new javax.swing.GroupLayout(statusPanel);
   statusPanel.setLayout(statusPanelLayout);
   statusPanelLayout.setHorizontalGroup(
   statusPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
   .addComponent(statusPanelSeparator, javax.swing.GroupLayout.DEFAULT_SIZE, 400, Short.MAX_VALUE)
   .addGroup(statusPanelLayout.createSequentialGroup()
   .addContainerGap()
   .addComponent(statusMessageLabel)
   .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 230, Short.MAX_VALUE)
   .addComponent(progressBar, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
   .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
   .addComponent(statusAnimationLabel)
   .addContainerGap())
   );
   statusPanelLayout.setVerticalGroup(
   statusPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
   .addGroup(statusPanelLayout.createSequentialGroup()
   .addComponent(statusPanelSeparator, javax.swing.GroupLayout.PREFERRED_SIZE, 2, javax.swing.GroupLayout.PREFERRED_SIZE)
   .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
   .addGroup(statusPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
   .addComponent(statusMessageLabel)
   .addComponent(statusAnimationLabel)
   .addComponent(progressBar, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
   .addGap(3, 3, 3))
   );

   setComponent(mainPanel);
   setMenuBar(menuBar);
   setStatusBar(statusPanel);
   }//

   // Variables declaration - do not modify
   private javax.swing.JPanel mainPanel;
   private javax.swing.JMenuBar menuBar;
   private javax.swing.JProgressBar progressBar;
   private javax.swing.JLabel statusAnimationLabel;
   private javax.swing.JLabel statusMessageLabel;
   private javax.swing.JPanel statusPanel;
   // End of variables declaration

   private final Timer messageTimer;
   private final Timer busyIconTimer;
   private final Icon idleIcon;
   private final Icon[] busyIcons = new Icon[15];
   private int busyIconIndex = 0;

   private JDialog aboutBox;
   }

2. 
   Ryan Bridglal said...
   10:26 pm - April 5th, 2009

   

3. 
   Ryan Bridglal said...
   10:28 pm - April 5th, 2009

   

4. 
   Ryan Bridglal said...
   10:29 pm - April 5th, 2009

   originally posted: Brooke Estabrook-Fishinghawk 13 Mar 09 7:14 AM MST
   Response to Ryan

   Wow that is a lot of work you did. Great job demonstrating your understanding!