February 2014
Beginner
1248 pages
62h 25m
English
Content preview from Java™ How To Program (Early Objects), Tenth Edition
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12.8 How Event Handling Works
Let’s illustrate how the event-handling mechanism works, using textField1 from the example of Fig. 12.9. We have two remaining open questions from Section 12.7:
1. How did the event handler get registered?
2. How does the GUI component know to call actionPerformed rather than some other event-handling method?
The first question is answered by the event registration performed in lines 43–46 of Fig. 12.9. Figure 12.13 diagrams JTextField variable textField1, TextFieldHandler variable handler and the objects to which they refer.
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