Object Oriented Design

Download A Java GUI programmer's primer by Fintan Culwin PDF

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By Fintan Culwin

A Java GUI Programmer's Primer presents an creation to the layout and improvement of Java artifacts that experience a graphical consumer interface. Written for college kids and execs, this publication will supply scholars with preliminary wisdom of, and abilities for, the powerful use of the interface parts provided with free up 1.1 of the Java language and its summary Windowing Toolkit (AWT).Emphasizing that the layout technique needs to start with usability issues and that the software program structure needs to replicate this overriding predicament, writer Fintan Culwin contains the subsequent vital features:* UML layout notation is continually used and emphasized.* constant use of free up 1.1 of Java and its AWT.* Interface usability modeled utilizing kingdom Transition Diagrams (STDs).* software program layout via constant use of sophistication and example diagrams.* An instance of each 1.1 AWT part included.* incorporates a case research illustrating diverse use interface styles.* Internalization and localization options are covered.* an internet site to aid the e-book is at scism.sbu.ac.uk/jfl

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6 were realized in a Windows 95 environment and the use of a square marker for check box buttons and round markers for radio buttons is a property of the peer environment, not of Java. Design Advice A collection of mutually exclusive radio buttons should always be grouped closely together on an interface and made distinct from other groups of components. The itemStateChanged() method included in the RadioExample class is exactly the same as that included in the CheckExample class above. When the Centre button was pressed the output produced was as follows, showing that only the selection of the Centre button and not the deselection of the previously selected button generates an ItemEvent.

The implementation of this class as far as the end of its constructor is as follows. java. Provides an initial example of the AWT TextField class. Written for the Java interface book Chapter 2 - see text. 2, August 1997. add( passwordField); } // End init. 15, and passwordField used to collect the user's input, shown on the right. On lines 0020 to 0022 the passwordField is constructed as an eight column empty TextField component with its echo character set to an asterisk and its ActionListener set to itself.

This will automatically enable the appropriate class of events on the Component and dispatch them to the actionPerformed(), or equivalent, method of the Listener. However when components are extended, as opposed to simply being used, the appropriate event classes will have to be explicitly enabled, using enableEvent(). Events generated by the Component will then be passed to the it's processEvent() method which, unless overridden, will indirect to the appropriate processWhateverEvent() method. Introductory examples of extending components will be given later in this chapter and more extensive examples in Chapter 3.

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