Class FocusAdapter
- java.lang.Object
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- java.awt.event.FocusAdapter
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- All Implemented Interfaces:
- FocusListener, EventListener
- Direct Known Subclasses:
- BasicSplitPaneUI.FocusHandler, BasicTabbedPaneUI.FocusHandler
public abstract class FocusAdapter extends Object implements FocusListener
An abstract adapter class for receiving keyboard focus events. The methods in this class are empty. This class exists as convenience for creating listener objects.Extend this class to create a
FocusEventlistener and override the methods for the events of interest. (If you implement theFocusListenerinterface, 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
addFocusListenermethod. When the component gains or loses the keyboard focus, the relevant method in the listener object is invoked, and theFocusEventis passed to it.- Since:
- 1.1
- See Also:
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FocusEvent,FocusListener, Tutorial: Writing a Focus Listener
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Constructor Summary
Constructors Constructor and Description FocusAdapter()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method and Description voidfocusGained(FocusEvent e)Invoked when a component gains the keyboard focus.voidfocusLost(FocusEvent e)Invoked when a component loses the keyboard focus.
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Method Detail
focusGained
public void focusGained(FocusEvent e)
Invoked when a component gains the keyboard focus.- Specified by:
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focusGainedin interfaceFocusListener
focusLost
public void focusLost(FocusEvent e)
Invoked when a component loses the keyboard focus.- Specified by:
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focusLostin interfaceFocusListener
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