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Currently, a total of 16 related Swing API packages (that is, subpackages) are available. It is important to be aware of them for development purposes, but this knowledge is not directly required for the exam.
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Swing has default skins that resemble the native look of many platforms. However, users still may notice subtle differences between a Swing application and a native or AWT one. Since Swing is a full-blown toolkit for creating user interfaces, it may not run as well on older hardware or systems that have limited resources. If your application is simple, sometimes a full Swing application introduces more complexity to a project than needed. It may be easier for the developer, and user, to create a simple web application with an HTML interface.
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A desktop Swing application can be deployed in two ways. The first method, and the traditional method, is to release your software as a package distributed by CD or for download over the network. The user will then run some form of installer to load the software onto their system. This is good if the software rarely changes. The user will have the software on their computer and will not have to worry about having a good network connection or reloading it from the enterprise server every time. However, if your software will be updated often, then the user will have to install the updates themselves. The second way to deploy a Swing application is to use Java Web Start. Java Web Start is a technology developed by Sun Microsystems to deploy Java applications like a Java applet. It allows a full desktop application to be launched from a web browser. Like an applet, it downloads all of the required files from a remote server. However, unlike an applet, it does not run inside the browser. It runs on the system similar to a native application. By default, a Web Start application is restricted from accessing the local file system and is limited as to which remote servers it can connect to. These restrictions can be overcome if the user allows it.
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This chapter focused on client-side Java technologies. End-users will typically access your data via a client-side application. No matter how well designed the software is on the backend, or server side, if the client-side application is poorly designed or inaccessible when needed, your user will find limited value in your software solution. In this chapter, we discussed a few different Java technologies used on the client side. On the SCJA, you will need to understand from a high level the advantage and disadvantage of each technology. It is also important to understand when it is appropriate to use one of the technologies over the other. Finally, you must understand how each technology is deployed and how this will affect the maintainability of the software. We started the chapter by discussing thin clients that use HTML and JavaScript. This type of client is a web-based front-end to your backend enterprise server. HTML alone allows for only a limited interactive user interface. JavaScript can be used to add more, but still limited, interactivity. JavaScript can also be used for input validation. This client type does nearly all of its processing on the server side. Maintenance is simplified since the software is located on your web server. The web server is also used to send that data to the user. Next, we covered J2ME. J2ME is aimed squarely at mobile and embedded devices. While its syntax is the same as J2SE and J2EE, since it is targeted at lower-power and resource-limited devices, it does not have access to all of the same libraries. J2ME only allows for a simple user interface, but on small devices it tends to provide all the functionality needed. Despite the drawbacks of J2ME, it does allow you to create client-side applications that can then connect to your backend enterprise servers. The tradeoff of limited functionality is quickly compensated with portability when a mobile phone is used as the target environment. Finally, we looked at two fat-client technologies: Java applets and Swing. Java applets allow for the creation of very dynamic and advanced user interfaces using Java, but then embed them in a web page. Applets are easy to maintain and deploy since they reside on your server and are transferred by a web server each time they are started. However, applets do come with restrictions. They are limited as to how they can interact with the client system and whom they can communicate with over the network. Swing is a technology in Java for building user interfaces. Swing is a standard part of J2SE. Normally, it is used to create full standalone Java applications. These applications can be created to look and feel like a native application for the target platform. A Swing application can connect to a backend database, or server. It tends to require more resources than the other technologies we discussed, but it can also provide the user with the most advanced user interface. Swing applications can utilize Java Web Start for deployment to simplify maintenance issues.
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