FocusListener (Java SE 12 & JDK 12 )

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

Method Summary

Modifier and Type	Method	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.

- Method Detail
  - focusGained
```
void focusGained(FocusEvent e)
```
    Invoked when a component gains the keyboard focus.
    
    Parameters:
    
    e - the event to be processed
  - focusLost
```
void focusLost(FocusEvent e)
```
    Invoked when a component loses the keyboard focus.
    
    Parameters:
    
    e - the event to be processed