Before adding Drag and Drop capabilities to my JTable, I read Java Tip 97 and Java Tip 114 from JavaWorld. They were fairly helpful, but I ended up doing things a little differently. In implementing my Drag and Drop JTree, however, I was plagued by a persistent exception: “InvalidDnDOperationException: Drag and drop in progress.” I debugged my code for hours …
I started working on a news aggregator application as my semester project last month, but it has turned into much more than the simple RSS reader is started out as. It now reads all versions of RSS, RDF and Atom. I’ve also updated the GUI to have a nicer look and feel. Here’s are some screen captures. …
I’ve recently been extending my Java RSS/Atom feed reader to support more versions of RSS. In doing so I’ve discovered that the version history of RSS is a lot more complicated than I’d thought. One would assume that the version history was linear from 0.9 through 2.0, but one would be wrong. Versions 0.9, 0.91, …
Robert Eckstein writes: The latest beta version of the Java 2 Platform Standard Edition 6.0 version (Mustang) now lets you access the system tray in Java with the help of two separate classes in the java.awt package: SystemTray and TrayIcon. These classes give you the ability to add graphics, popup menus, and floating tip functionality …
I recently wrote a news reader application (RSS only at the moment) that displays the messages using HTML. In doing so, I discovered the terrible state of the javax.swing.text.html.HTMLEditorKit. From the Javadoc: The default support is provided by this class, which supports HTML version 3.2 (with some extensions), and is migrating toward version 4.0. Migrating toward …
By default a left mouse click on a JTable row will select that row, but it’s not the same for the right mouse button. It takes bit more work to get a JTable to select a row based on right mouse clicks. You might be able to do it by subclassing JTable or ListSelectionModel, but there’s an easier way. 1. Use a MouseAdapter to …
I was recently tasked with an assignment that required me to draw several randomly generated colored circles and a target to a playing field. The user can choose the circle that he/she thinks will hit the target first and then bet on it. To make the choice as simple as possible I wanted a way …
Turning your Graphics/Graphics2D Drawings into an ImageIcon Read More »
When I initially began reading about and using generics in Java, I heard the term “erasure”, but forgot it almost as soon as I’d read it. This is mostly because it didn’t really seem to affect my usage of generics at the time. Erasure is the process by which the compiler changes your parameterized generic …
Our class has just started learning about RMI. Many of the tutorials I’ve looked at are a bit out of date, however. For instance, many of them still mention generating stubs and/or skeletons using the rmic command, but this is no longer necessary as of jdk 1.5. All you have to do now is compile your classes and stub files …
The more I look into the different third-party Java technologies/frameworks, the more overwhelmed I feel. The list just gets bigger and bigger. And just as I start to look into something I hear that something newer and better is coming to replace it. Here are the names of a few of the Java technologies I’ve …