Jan Graba's An Introduction to Network Programming with Java: Java 7 PDF

By Jan Graba

ISBN-10: 1447152549

ISBN-13: 9781447152545

Because the moment variation of this article, using the net and networks in general has endured to extend at a good looking price. This has ended in either a rise favourite for community software program and to advancements within the expertise used to run such networks, with the latter obviously resulting in alterations within the former. in this time, the Java libraries were up to date to maintain with the hot advancements in community expertise, in order that the Java programming language is still one of many mainstays of community software program development.

In supplying a really readable textual content that avoids getting immersed in low-level technical info, whereas nonetheless delivering an invaluable, useful consultant to community programming for either undergraduates and busy IT execs, this 3rd version maintains the fashion of its predecessors. To hold its foreign money, the textual content has been up to date to mirror adjustments that experience taken position in Java's community know-how over the last seven years (including the discharge of Java 7), while conserving its impressive gains of diverse code examples, screenshots and end-of-chapter routines.

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Extra info for An Introduction to Network Programming with Java: Java 7 Compatible (3rd Edition)

Example text

Focus control In other words, each of these subsystems is given an opportunity to deal with the keystroke, in the order shown. Once one them has resolved (that is, dealt with) the keystroke, it is not delivered to any others. When a key is delivered to a control and resolved, we say that the key was consumed. We will discuss each subsystem from the bottom up, starting with keyboard events and the focus control, because this is the likely order that you will need these concepts. 2 Keyboard Events and the Focus Control Keyboard focus is the property that determines the target for keys that the user types.

Events. For example, to listen for a dispose event on a widget, application code would use addDisposeListener(). addDisposeListener(DisposeListener listener) Adds the listener to the collection of listeners that will be notified when a widget is disposed. When the widget is disposed, the listener is notified by calling its widgetDisposed() method. The following code fragment listens for a dispose event on a widget. addDisposeListener(new DisposeListener() { public void widgetDisposed(DisposeEvent event) { // widget was disposed } }); DisposeListener is an interface.

They will be described in detail later in the book. It is more important at this time that the "rules" are complete. Rule 1: If you created it, you dispose of it. SWT ensures that all operating system resources are acquired when the widget is created. As we have already seen, this happens in the constructor for the widget. What this means is that you are responsible for calling dispose() on SWT objects that you created using new. SWT will never Part I: Widgets 43 44 Part I: Widgets create an object that needs to be disposed of by the programmer outside of a constructor.

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An Introduction to Network Programming with Java: Java 7 Compatible (3rd Edition) by Jan Graba

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