Download A Java Foundation Classes Primer by Fintan Culwin PDF

By Fintan Culwin

ISBN-10: 033377339X

ISBN-13: 9780333773390

This article introduces the scholar to the most important wigets and protocols of the JFC, presenting a adequate knowing in order that extra complicated amenities might be approached. supreme for a moment path in Java, it's going to allow scholars to construct on a few familiarity with using item orientated layout and improvement in Java to effectively engineer interfaces.

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An instance of this class is constructed from the init() method of the Stopwatch class which will be described next. 7. The implementation of the Stopwatch class, as far as the start of the init() method, is as follows. java A class which demonstrates receiving ActionEvents from a unicaster, from a GIU and responding to them. Written for the JFC book chapter 1 - see text. 1, Dec 1999. *; public class Stopwatch extends JApplet implements ActionListener { private private private private private final static final static final static final static int theState int INITIAL int RESET int RUNNING int STOPPED = INITIAL; = = = = 0; 1; 2; 3; private Timer aTimer = null; private StopwatchUI theUI = null; Following the (by now) expected header comments, package declaration, importations and class declaration, lines 0018 to 0021 declare a set of manifest values to model the four states of the interface.

The absence of pre-conditions on all of these transitions, coupled with the regularity of their effects and the single application state, allows a developer to predict at this stage that the artifact will be simple and intuitive to use. The transitions involved in showing and using the scroll bars are not shown on this diagram as they require no effort by the developer, as will be shown shortly. 5. The artifact itself is an instance of the FontViewer class which extends the JApplet class and supplies the translation aspects of the three layer architecture.

1 Introduction Chapter 1 provided a detailed introduction to the design and development of artifacts that have a graphical user interface. The intention of this chapter is to consolidate that understanding by providing a description of the design and development of a second artifact. This will involve introducing more of the JFC components and also different classes of events that are dispatched by them. The event source/listener protocol, which was emphasized in the previous chapter, will again be described, this time in the context of these different classes of event sources and listeners.

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