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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
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Solution

To determine which option is not a valid listener for Java GUI, we can analyze the given options.

  1. FocusListener: This is a valid listener in Java Swing that listens for changes in focus on components.

  2. KeyListener: This is also a valid listener that listens for keyboard events (key presses, key releases).

  3. TextListener: This is not a standard listener in Java's Swing or AWT libraries. There is an ActionListener or DocumentListener that can respond to changes in text, but there is no standalone TextListener.

  4. 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.

This problem has been solved

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