FocusListener (Java 2 Platform SE v1.4.2) - Java 2 SDK v1.4.2, Java 2 SDK 英文文档

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Java^TM 2 Platform
Std. Ed. v1.4.2

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java.awt.event
Interface FocusListener

All Superinterfaces:: EventListener

All Known Implementing Classes:: AWTEventMulticaster, BasicButtonListener, BasicComboBoxEditor, BasicComboBoxUI.FocusHandler, BasicListUI.FocusHandler, BasicSliderUI.FocusHandler, BasicTableUI.FocusHandler, BasicToolBarUI.ToolBarFocusListener, BasicTreeUI.FocusHandler, Component.AccessibleAWTComponent.AccessibleAWTFocusHandler, DefaultCaret, FocusAdapter, JComponent.AccessibleJComponent.AccessibleFocusHandler

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

public void focusGained(FocusEvent e)

Invoked when a component gains the keyboard focus.

focusLost

public void focusLost(FocusEvent e)

Invoked when a component loses the keyboard focus.