|By John Fronckowiak||
|July 1, 1997 12:00 AM EDT||
What Is The AFC?
I know that football season is right around the corner, but you're not going to find an in-depth analysis of football's weaker conference here. The Application Foundation Classes, or AFC, are Microsoft's answer to the Abstract Windowing Toolkit (AWT). The AFC builds on the AWT foundation to provide more user-friendly controls for your applications. The AFC is currently available only as a preview release and requires a Java 1.02 or 1.1 compatible compiler and Virtual Machine.
Last month, I showed you how to obtain, install and use the latest Java SDK 2.0 from Visual J++. You'll need to get the Java SDK 2.0 to begin using the Application Foundations Classes. The Java SDK 2.0 currently is available in a preview release. Check out the Microsoft Java SDK Web site at http://www.microsoft.com/java for the latest information.
The Application Foundation Classes are provided in three packages:
The User Interface package is the heart of the AFC. The focus here will be on how to begin to integrate the User Interface package into your own applications. I'll take a closer look at the FX and Resource packages in the near future.
The Application Foundation Classes are built on the foundation laid by the AWT. If you're already familiar with using the AWT, much of what you already know will remain familiar. Figure 1 illustrates the Application Foundation Class Hierarchy. The class names preceded by an asterisk (*) are AWT classes. As you can see, all of the Application Foundation Classes are extended from these base AWT classes. Figure 2 illustrates the class hierarchy of the user interface elements provided by the Application Foundation Classes. Many of these elements will be familiar to those familiar with AWT (i.e., button, check boxes, radio button) while others were not previously available (i.e., tree control, marquee).
AWT and AFC Compared
Before you think, "Here goes Microsoft again, trying to usurp yet another piece of the Java world", let's take a closer look. The Application Foundation Classes are built upon and extend the AWT, making it possible to mix both user interface models in your applications, which helps to preserve your user interface investment in your current applications and ease the transition over to a new programming model. Other user interface class models usually force a developer to choose between the AWT and another library.
Like the AWT, the Application Foundation Classes are written completely in Java, making them completely cross platform-independent. They provide new and better scroll bars and sliders, a tree control, a tab display, the ability to move through the user interface using just the keyboard and a file system explorer. The Application Foundation Classes permit the development of applications with user interfaces that are familiar to users of traditional Windows-based applications.
How To Use The AFC
Building Java applications with the Application Foundation Classes is no different from building your applications using the AWT. Instead of using the Applet and Frame classes, the UIApplet and UIFrame classes are substituted instead. Since the UIApplet and UIFrame classes are extended from the AWT Applet and Frame classes, it is possible to mix both AWT and Application Foundation Classes components. Listing 1 demonstrates how to create a shell AFC applet. Listing 2 demonstrates how to call the HTML necessary to call the shell applet. The AFC can also be used to create standalone applications. Listing 3 demonstrates how to create a standalone shell application using the Application Foundation Classes. Remember, you-ll need to have the Microsoft Java SDK 2.0 preview version installed and have your Visual J++ environment configured to use the pre-release version of the compiler. I described how to configure your Visual J++ environment to use the new version of the compiler in detail last month. In its current release, the Application Foundation Classes support both the traditional event handling model as used in these examples and the event delegation model supported by Java 1.1.
The Application Foundation Classes are available as part of the Microsoft Java SDK 2.0 on the Microsoft Java Web site, http://www.microsoft.com/java. If you're looking to use the Application Foundation Classes on non-Windows based platforms, the classes are also provided separately. Since the new compiler and the Application Foundation Classes are still pre-release versions, a few bugs still exist and they aren't optimized yet for full production use. The final version of the Application Foundation Classes is scheduled to ship with Internet Explorer Version 4.0 later this year.
It's clear that the Application Foundation Classes will play an increasingly important role in the development of Java applications from a Microsoft perspective. It's uncertain if the Application Foundation Classes will win over the hearts and minds of all Java developers - given the current state of relations between Microsoft, Sun and JavaSoft. The Application Foundation Classes do provide a number of user interface elements that allow developers to create applications with familiar user interfaces (at least to Windows users). I'm sure that when the Application Foundation Classes and the Java SDK 2.0 are released in their final form, Microsoft will provide Visual J++ wizards which help to automate the process of creating applications and applets which use the Application Foundation Classes.
Microsoft currently does not plan on releasing the source code for the Application Foundation Classes. The plan is to make up for the lack of source code with documentation and support. This stance may hurt the Application Foundation Classes- chances of gaining wider acceptance; stay tuned though, this story is just beginning.
Next Month: Using Application Foundation Class User Interface Controls.
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