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## java.awt.event
Interface FocusListener

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

    public interface FocusListener

extends EventListener

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, Reference: The Java Class Libraries (update file)

Method Summary
`void` | `focusGained(FocusEvent e)` Invoked when a component gains the keyboard focus.
`void` | `focusLost(FocusEvent e)` Invoked when a component loses the keyboard focus.

Method Detail

### focusGained

    void focusGained(FocusEvent e)

  Invoked when a component gains the keyboard focus.

### focusLost

    void focusLost(FocusEvent e)

  Invoked when a component loses the keyboard focus.

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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2004 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.