public abstract class FocusAdapter extends Object implements FocusListener
Extend this class to create a FocusEvent listener
and override the methods for the events of interest. (If you implement the
FocusListener interface, you have to define all of
the methods in it. This abstract class defines null methods for them
all, so you can only have to define methods for events you care about.)
Create a listener object using the extended class and then register it 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.
FocusEvent,
FocusListener,
Tutorial: Writing a Focus Listener| Constructor and Description |
|---|
FocusAdapter() |
| Modifier and Type | Method and Description |
|---|---|
void |
focusGained(FocusEvent e)
Invoked when a component gains the keyboard focus.
|
void |
focusLost(FocusEvent e)
Invoked when a component loses the keyboard focus.
|
public void focusGained(FocusEvent e)
focusGained in interface FocusListenerpublic void focusLost(FocusEvent e)
focusLost in interface FocusListener Submit a bug or feature
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
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