Java 6 Illuminated: An Active Learning Approach, 2nd Edition

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Be sure that the header of

the actionPerformed

method is coded correctly.

Otherwise,your method

will not override the

abstract actionPerformed

method,as required by the

ActionListener interface.

COMMON ERROR

TRAP

12.5 Text Fields 843

TABLE 12.10 ActionListener Method API

public void actionPerformed( ActionEvent event )

An event handler that implements the ActionListener interface writes code in this method to

respond to the ActionEvent fired by any registered components.

display a legal warning, we turn off the ability of the user to type into the

text area by calling the setEditable method with the argument false (line 45).

At lines 47–53, we add all the components ...