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J2ME MIDlets are generally deployed over a network. They can be manually loaded onto a device, but that isn t very useful for a large install base. Typically, they will be loaded by a web server, serving them to clients upon their request. A MIDlet on a web server will consist of at least two files: a Java Application Descriptor, or JAD, and the Java Archive, or JAR file. The JAD file is used to describe the MIDlet. It is a text file that contains information such as the MIDlet s version, the location of the JAR, the location of the icon (if it exists), and many other attributes. The exact specification of creating a JAD is beyond the scope of the SCJA. It is important, however, to remember that the JAD is used to describe what the MIDlet is to the target devices. The JAR file is the same as a standard Java JAR file. It is a collection of all the binary files and resources that make up the MIDlet.
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The current SCJA exam uses the term J2ME for the mobile addition of Java. Since the test has been published, Sun Microsystems has changed its official name to Java ME. Both J2ME and Java ME refer to the same thing and can be used interchangeably. However, if you want to stay up-to-date, you should use Java ME.To avoid confusion, this book will use the same terms as the exam.
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Exam Objective 7.3 Describe at a high level the basic characteristics, benefits, drawbacks, and deployment issues related to creating fat-clients using Applets. Applets are one of the two fat-client technologies that the SCJA exam will cover. A fat-client technology is one where most or all of the processing for the application is done on the client side. Applets, as the name implies, are mini-applications. They are useful when creating an application with a complex interface, but would still like to tightly couple it with a web page. The SCJA exam will have questions that require you to choose when using an applet would be appropriate and determine their advantages and disadvantages. The following topics will be covered in the next few subsections.
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Applets are simple and effective tools that have existed in Java since 1995. They were created to add an interactive element to an HTML web page. Applets can be embedded in more than just HTML; they may be used in full applications or even as a standalone application. However, their primary function is to provide interactive qualities to a web site that cannot be produced in HTML alone. Since applets are really just a special Java application, they can be executed regardless of the platform the user is running. Applets are executed entirely on the client side. Their only requirement is that the remote system has the Java browser plug-in and Java Virtual Machine installed.
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11:
Understanding Client-Side Technologies
From a programming perspective, there is very little difference between a Java desktop application and a Java applet. An applet can easily be modified into a standard desktop application. With some exceptions, a simple desktop application can be changed into an applet. The main difference between the two is the way the code is invoked. The programming difference will not be on the SCJA exam. An applet s advantage is its ability to be embedded in a web page but still retain powerful features that would normally be found in a standard desktop application. An applet will allow the client to access backend enterprise servers such as web servers, web services, and databases. It also can make use of advanced Java user interface elements such as Swing and multimedia libraries for media playback.
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