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Despite the simplicity of a Java applet, there are some disadvantages to using them. As stated earlier, to execute the applet the Java Virtual Machine must be used. It also must be a current version. If an applet is executed on an out-of-date Virtual Machine, the applet will attempt to download the latest version. This may create a substantial delay in the startup time of the applet. Applets have much tighter runtime restrictions than a standard Java application. By default, they are not permitted to create network connections to arbitrary servers on the Internet. They also are executed in a sandbox that gives them limited access to the client-side system. And even if more than one applet is embedded in the same page, intercommunication is impossible. These restrictions may be relaxed but the user must agree to it via a prompt from the Java Virtual Machine. Since applets are often located inside web pages, they are not able to be executed offline. The user must have a network connection to the server that contains the applet. If the user does have a network connection but limited bandwidth, the user may suffer from very slow load times since the applet is reloaded each time it is run. Some cache is available to help speed up this process, but this is unreliable since it can easily be cleared. Applets were Sun Microsystems attempt to create dynamic web pages. When Sun first introduced them in 1995, web pages were not able to do much except serve static content. Applets allowed fully functioning mini applications to be embedded in web pages, but were plagued with problems from the start. Applets were resource hungry and had compatibility problems between Sun s Virtual Machine and Microsoft s. By the time these problems had been addressed, new technologies such as JavaScript provided similar functionality. Currently, applets are rarely used outside of special cases.
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Applets are easy to deploy. They reside on the web server and are embedded in the web page. When the user accesses the web page, as long as the user has the Java Virtual Machine installed with the Java browser plug-in, the applet will load. The advantage of this system of deployment is that the user never needs to install an application. From the user s perspective, they are just visiting a web page. This also allows the programmer to control the deployed version of the applet. When a new version is released, it can be loaded on the web server and the next time the user visits the site and loads the applet, the newer version will be used.
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Exam Objective 7.4 Describe at a high level the basic characteristics, benefits, drawbacks, and deployment issues related to creating fat-clients using Swing. Swing is the second fat-client technology present on the SCJA exam. Swing is a graphical user interface toolkit for creating an application s interface. It is responsible for drawing and maintaining all the components on screen, such as buttons, text boxes, scroll bars, and so on. The SCJA exam will ask questions about when it is appropriate to use Swing over other competing technologies and the benefits it provides. The following topics will be covered in the next few subsections.
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On the SCJA, when they refer to Swing, they are normally using it in the context of a desktop application. It is important to remember that Swing is a library for creating user interfaces. It is normally used in desktop applications but can also be used to build the interfaces of applets.
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11:
Understanding Client-Side Technologies
Java Swing API
Swing is Sun Microsystems second version of a graphical user interface toolkit for Java. It is used to create the user interfaces for applets and desktop applications. The Abstract Window Toolkit (AWT) is the predecessor of this toolkit. At a low level, Swing extends some of the classes of AWT. However, there is a vast difference on how they render their components. AWT is considered heavyweight. This means that they rely on the native system s windowing components. An AWT component will utilize the native system to render and control each component used. This guarantees the interface will look like the interface of a native application. Since all native toolkits do not work the same way, AWT had to make some assumptions to work across platforms. While AWT managed to work fairly well, the assumptions it made created some minor bugs and strange behaviors that depended on which native toolkit was being used. To solve the problems of AWT, Sun created the Swing API. Unlike AWT, Swing is a lightweight toolkit. This means that Swing does not rely on the native toolkit but instead draws and manages all of its own components. This makes the interface more portable because it does not depend on different native components behaving similarly. However, since Swing does draw its own components, the look and feel may be slightly different from a native or AWT application. Swing does have the advantage of being skin-able. Skin-able is a term that means the developer can change the look and feel of Swing without having to modify its components. The source code of a component does not require modification to change its look and feel. It is distributed with different skins that give it the appearance of a native application on different platforms. Swing is a standard part of J2SE. It allows for the creation of fully featured desktop applications. These applications are often designed to run on a client s system just like they run on any other native program oftentimes being indistinguishable. Swing offers the richest set of user interface components. The applications have full access to the system they are executed on, and can feature a complex interface for performing more demanding tasks. The only requirement to run a Swing application is to have the Java Virtual Machine installed. It does not require a network connection unless it is required to connect to a server during runtime. In modern applications, AWT is rarely used for components. Swing has proven to be more efficient and consistent across different platforms. AWT can create an application that looks more native than Swing, but the difference is normally insignificant.
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