Fintan Culwin's A Java Foundation Classes Primer PDF

By Fintan Culwin

ISBN-10: 033377339X

ISBN-13: 9780333773390

This article introduces the coed to the foremost wigets and protocols of the JFC, providing a enough knowing in order that extra complex amenities might be approached. very best for a moment path in Java, it may 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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This completes the description of the design and implementation of the StopwatchUI class. 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 only other aspect of the interface’s visible state that needs to be ensured when it is in the reset state is the time value displayed. This should always be zero in the reset state and this is accomplished, on line 0071, by calling this StopwatchUI’s setTime() method with the argument 0. The two remaining methods, setRunningState() and setStoppedState(), are similar to the setResetState() method, but need not be concerned with the value displayed on the TimerLabel. They are implemented as follows.

Any or all of the labels may be empty (although if all three were empty the meaning of the transition would be most unclear). If the event is empty then the pre-condition will be tested as soon as the interface arrives in that state and the transition will be taken only if it is true. An empty pre-condition is taken as true, so the transition will be followed as soon as the event occurs. Empty consequences indicate that nothing happens, apart from the state change, during the transition. In general, empty consequences should be treated with suspicion, as there will be no visible indication to the user that a transition has occurred and so no way by which they can become aware of it.

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A Java Foundation Classes Primer by Fintan Culwin


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