There are numerous listeners that exists which can be applied in Java GUI. Which one is not?*1 pointFocusListenerKeyListenerTextListenerNone of the above
Question
There are numerous listeners that exists which can be applied in Java GUI. Which one is not?
1 point
- FocusListener
- KeyListener
- TextListener
- None of the above
Solution
To determine which option is not a valid listener for Java GUI, we can analyze the given options.
-
FocusListener: This is a valid listener in Java Swing that listens for changes in focus on components.
-
KeyListener: This is also a valid listener that listens for keyboard events (key presses, key releases).
-
TextListener: This is not a standard listener in Java's Swing or AWT libraries. There is an
ActionListener
orDocumentListener
that can respond to changes in text, but there is no standaloneTextListener
. -
None of the above: This implies that all previous options are valid listeners, which is not correct given that
TextListener
does not exist in standard Java GUI libraries.
Final Answer
The option that is not a valid listener in Java GUI is TextListener.
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