By Fintan Culwin
This article introduces the scholar to the main wigets and protocols of the JFC, providing a enough realizing in order that extra complicated amenities may be approached. ultimate for a moment direction in Java, it's going to 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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Additional resources for A Java Foundation Classes Primer
On the right is the stopped state, obtained by pressing the stop button in the running state; here the display is not updated and continues to show the time when the stop button was pressed. In this state only the reset button is capable of being pressed, and pressing it causes the interface to revert to the reset state. A description of the required behavior of an interface can be more conveniently and precisely expressed in a State Transition Diagram (STD). 9. A state transition diagram consists of a number of states, generally shown as rectangular boxes, which might illustrate salient parts of the appearance of the interface while it is in that state, connected by transitions, shown as arrows with three labels.
A String is only appropriate for the family argument to the Font constructor, and the other two arguments must be converted into integer values. The requiredSize argument is converted directly into an int when the local variable fontSize is declared on line 0106. Font public Font( String family, int style, int size) Constructs a Font instance of the family specified, which should be one of the logical font family names: “Monospaced”, “Serif ”, “Sans serif ”, “Dialog” or “Dialog input”. ITALIC. The size argument can be arbitary and the platform will either supply a scaled font to the size requested or the nearest available size.
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.
A Java Foundation Classes Primer by Fintan Culwin