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The definition in Segment 925 includes the definition of a listener that connects text fields and buttons to setters inside the form, maintaining the form's instance variables.
For example, if you type a new value into the first text field, and press the Enter key, you initiate the following sequence of calls:
The form view The action event listener Text field 1
Enter pressed
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*-------------------------------*
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v
actionPerformed
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*---------------------------> getText
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setValue1 <---------------*
Alternatively, if you press the first plus button, you initiate the following sequence of calls:
The form view The action event listener Plus Button 1
Mouse clicked
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*-------------------------------*
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v
actionPerformed
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setValue1 <---------------*