By Fintan Culwin
A Java GUI Programmer's Primer offers an creation to the layout and improvement of Java artifacts that experience a graphical consumer interface. Written for college kids and pros, this publication will supply scholars with preliminary wisdom of, and abilities for, the potent use of the interface parts provided with liberate 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 crisis, writer Fintan Culwin comprises the subsequent very important 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 nation Transition Diagrams (STDs).* software program layout via constant use of sophistication and example diagrams.* An instance of each 1.1 AWT part included.* encompasses a case learn illustrating assorted use interface styles.* Internalization and localization thoughts are covered.* a website to help the booklet is at scism.sbu.ac.uk/jfl
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There are a similar set of methods for the ComponentEvent, InputEvent and MouseEvent classes. Further details of these, and other event classes, such as the ActionEvent introduced in Chapter 1, will be given throughout the rest of this chapter. 6 Event handling resources of the Component class. The usual technique for handling events is to register a Listener object with the Component using the appropriate addWhateverListener() method, for example addActionListener(). This will automatically enable the appropriate class of events on the Component and dispatch them to the actionPerformed(), or equivalent, method of the Listener.
Println(); } // End if. } // End itemStateChanged. On line 0045 the identity of the List is retrieved, as before, and on line 0046 the array of Strings containing the selected items is obtained using its getSelectedItems() method. If the list is empty a message stating this is output on line 0049, otherwise, on lines 0051 to 0055, a for loop outputs all the items in the list . The output produced by this method when the cities "Barcelona", "Istanbul" and "Athens" were first selected and then deselected, is as follows.
For single line text, it is more convenient to handle ActionEvents than to handle the TextEvents which are generated every time the text in the component changes. To illustrate the use of TextField components a PasswordEntry applet will be produced. This applet will start by inviting the user to "Please enter the magic word" in a non-editable TextField. A second editable text field with the echo character set to an asterisk (*) will allow the user to type in an attempt. When the user presses the
A Java GUI programmer's primer by Fintan Culwin