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Showing content from https://docs.oracle.com/en/java/javase/19/docs/api/java.desktop/java/awt/event/FocusListener.html below:

FocusListener (Java SE 19 & JDK 19)

All Superinterfaces:

EventListener

All Known Implementing Classes:

AWTEventMulticaster, BasicButtonListener, BasicComboBoxEditor, BasicComboBoxEditor.UIResource, BasicComboBoxUI.FocusHandler, BasicListUI.FocusHandler, BasicSliderUI.FocusHandler, BasicSplitPaneUI.FocusHandler, BasicTabbedPaneUI.FocusHandler, BasicTableUI.FocusHandler, BasicTextUI.BasicCaret, BasicToolBarUI.ToolBarFocusListener, BasicTreeUI.FocusHandler, Component.AccessibleAWTComponent.AccessibleAWTFocusHandler, DefaultCaret, FocusAdapter, JComponent.AccessibleJComponent.AccessibleFocusHandler, MetalComboBoxEditor, MetalComboBoxEditor.UIResource

The listener interface for receiving keyboard focus events on a component. The class that is interested in processing a focus event either implements this interface (and all the methods it contains) or extends the abstract FocusAdapter class (overriding only the methods of interest). The listener object created from that class is then registered with a component using the component's addFocusListener method. When the component gains or loses the keyboard focus, the relevant method in the listener object is invoked, and the FocusEvent is passed to it.

Since:

1.1

See Also:

• FocusAdapter
• FocusEvent
• Tutorial: Writing a Focus Listener

• Method Summary

  void

  Invoked when a component gains the keyboard focus.

  void

  Invoked when a component loses the keyboard focus.

• Method Details
  • focusGained

    Invoked when a component gains the keyboard focus.

    Parameters:

    e - the event to be processed

  • focusLost

    Invoked when a component loses the keyboard focus.

    Parameters:

    e - the event to be processed

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