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Swing
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his chapter presents a series of recipes that demonstrate Swing, Java s premier GUI toolkit Defined by a rich set of visual components and a tightly integrated, highly adaptive architecture, Swing enables the creation of sophisticated, yet streamlined user interfaces Today s user demands a high-quality visual experience, and Swing is the framework that you will use to supply it Swing is a very large topic, and an entire book is needed to describe all of its features Therefore, it is not possible to address all aspects of Swing in this chapter For example, Swing allows a high level of customization and supports many advanced features that let you tailor aspects of its inner workings Although important, these features are not used by most programmers on a daily basis, and they are not the focus of this chapter Instead, the recipes presented here illustrate fundamental techniques and commonly used components The recipes also answer many frequently asked how to questions about Swing In essence, the goal is to show key pieces of Swing s component set in action, as they are used in day-to-day programming Of course, you can adapt the recipes and layer on additional functionality as needed by your application Here are the recipes in this chapter: Create a Simple Swing Application Set the Content Pane s Layout manager Work with JLabel Create a Simple Push Button Use Icons, HTML, and Mnemonics with JButton Create a Toggle Button Create Check Boxes Create Radio Buttons Input Text with JTextField Work with JList Use a Scroll Bar Use JScrollPane to Handle Scrolling Display Data in a JTable
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Herb Schildt s Java Prog ramming Cookbook
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Handle JTable Events Display Data in a JTree Create a Main Menu
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NOTE For a comprehensive introduction to Swing, see my book Swing: A Beginner's Guide
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published by McGraw-Hill, 2007 The overview that follows and many of the discussions in this chapter are adapted from that work
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Overview of Swing
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Swing did not exist in the early days of Java Rather, it was a response to deficiencies present in Java s original GUI subsystem: the Abstract Window Toolkit (AWT) The AWT defines a basic set of components that support a usable, but limited graphical interface One reason for the limited nature of the AWT is that it translates its various visual components into their corresponding, platform-specific equivalents, or peers This means that the look and feel of an AWT component is defined by the platform, not by Java Because the AWT components use native code resources, they are referred to as heavyweight The use of native peers led to several problems First, because of differences between operating systems, a component might look, or even act, differently on different platforms This potential variability threatened the overarching philosophy of Java: write once, run anywhere Second, the look and feel of each component was fixed (because it is defined by the platform) and could not be (easily) changed Third, the use of heavyweight components caused some frustrating restrictions For example, a heavyweight component is always rectangular and opaque Not long after Java s original release, it became apparent that the limitations and restrictions present in the AWT were sufficiently serious that a better approach was needed The solution was Swing Introduced in 1997, Swing was included as part of the Java Foundation Classes (JFC) Swing was initially available for use with Java 11 as a separate library However, beginning with Java 12, Swing (and the rest of the JFC) was fully integrated into Java Swing addresses the limitations associated with the AWT s components through the use of two key features: lightweight components and a pluggable look and feel Although they are largely transparent to the programmer, these two features are at the foundation of Swing s design philosophy and the reason for much of its power and flexibility Let s look at each With very few exceptions, Swing components are lightweight This means that a component is written entirely in Java It does not rely on platform-specific peers Lightweight components have some important advantages, including efficiency and flexibility For example, a lightweight component can be transparent, which enables nonrectangular shapes Furthermore, because lightweight components do not translate into platform-specific peers, the look and feel of each component is determined by Swing, not by the underlying operating system This means that each component will work in a consistent manner across all platforms Because each Swing component is rendered by Java code rather than by platformspecific peers, it is possible to separate the look and feel of a component from the logic of the component, and this is what Swing does Separating out the look and feel provides
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Making Barcode In C#
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8:
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Making Bar Code In None
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