By Fintan Culwin
This article introduces the scholar to the main wigets and protocols of the JFC, providing a adequate figuring out in order that extra complicated amenities might be approached. superb for a moment path in Java, it may permit scholars to construct on a few familiarity with using item orientated layout and improvement in Java to effectively engineer interfaces.
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Extra resources for A Java Foundation Classes Primer
An initial artifact – introducing event handling 0018 0019 private Timer aTimer = null; private TimerLabel aTimerLabel = null; Following the header comments, the package declaration and the importation of the required facilities, the class is declared in accord with the class diagram on lines 0015 and 0016. Lines 0018 and 0019 then declare, but do not construct, the two private attributes. The init() method is implemented as follows. start(); } // End init. This method is divided into two parts, the first concerned with the TimerLabel and the second with the Timer.
Subsequently, layout negotiations will position the components just before the interface becomes visible. ♦ An object interaction diagram can be used to show which messages are sent between objects and used to confirm that closure of every user’s action will be effected. 1 Reimplement the Stopwatch artifact omitting the sychronized keyword from the Timer resetTime() and Stopwatch actionPerformed() methods. Execute the artifact and show how its behavior subsequently fails. 2 Design, using an STD, a layout diagram and class diagrams a LapTimer artifact.
The layout management diagram shows the relationships between the highest level window provided by the StopwatchUI and all other JFC components that are added to it. In order to obtain the required layout the window’s contentPane has to have a BorderLayout management policy. 12 StopwatchUI class diagram. identified as North, South, East, West and Center, with relationships as shown. Each area can contain a single component and there is no requirement for all components to be the same size. For the Stopwatch artifact only the center and south locations are occupied, each with an instance of the JPanel class as shown.