Module java.desktop
Package java.awt.event

# Class WindowAdapter

java.lang.Object
java.awt.event.WindowAdapter

All Implemented Interfaces:
  `WindowFocusListener`, `WindowListener`, `WindowStateListener`, `EventListener`

Direct Known Subclasses:
  `BasicToolBarUI.FrameListener`, `JMenu.WinListener`

public abstract class WindowAdapter extends Object implements WindowListener, WindowStateListener, WindowFocusListener
An abstract adapter class for receiving window events. The methods in this class are empty. This class exists as convenience for creating listener objects.

Extend this class to create a `WindowEvent` listener and override the methods for the events of interest. (If you implement the `WindowListener` 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 Window using the window's `addWindowListener` method. When the window's status changes by virtue of being opened, closed, activated or deactivated, iconified or deiconified, the relevant method in the listener object is invoked, and the `WindowEvent` is passed to it.

Since:
  1.1
See Also:
  - `WindowEvent`
  - `WindowListener`
  - Tutorial: Writing a Window Listener

## Constructor Summary

Constructors
Modifier
Constructor
Description
`protected`
`WindowAdapter()`
Constructs a `WindowAdapter`.

## Method Summary

Modifier and Type
Method
Description
`void`
`windowActivated(WindowEvent e)`
Invoked when a window is activated.
`void`
`windowClosed(WindowEvent e)`
Invoked when a window has been closed.
`void`
`windowClosing(WindowEvent e)`
Invoked when a window is in the process of being closed.
`void`
`windowDeactivated(WindowEvent e)`
Invoked when a window is de-activated.
`void`
`windowDeiconified(WindowEvent e)`
Invoked when a window is de-iconified.
`void`
`windowGainedFocus(WindowEvent e)`
Invoked when the Window is set to be the focused Window, which means that the Window, or one of its subcomponents, will receive keyboard events.
`void`
`windowIconified(WindowEvent e)`
Invoked when a window is iconified.
`void`
`windowLostFocus(WindowEvent e)`
Invoked when the Window is no longer the focused Window, which means that keyboard events will no longer be delivered to the Window or any of its subcomponents.
`void`
`windowOpened(WindowEvent e)`
Invoked when a window has been opened.
`void`
`windowStateChanged(WindowEvent e)`
Invoked when a window state is changed.

### Methods declared in class java.lang.Object

`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

## Constructor Details

### WindowAdapter

protected WindowAdapter()
Constructs a `WindowAdapter`.

## Method Details

### windowOpened

public void windowOpened(WindowEvent e)
Invoked when a window has been opened.

Specified by:
  `windowOpened` in interface `WindowListener`
Parameters:
  `e` - the event to be processed

### windowClosing

public void windowClosing(WindowEvent e)
Invoked when a window is in the process of being closed. The close operation can be overridden at this point.

Specified by:
  `windowClosing` in interface `WindowListener`
Parameters:
  `e` - the event to be processed

### windowClosed

public void windowClosed(WindowEvent e)
Invoked when a window has been closed.

Specified by:
  `windowClosed` in interface `WindowListener`
Parameters:
  `e` - the event to be processed

### windowIconified

public void windowIconified(WindowEvent e)
Invoked when a window is iconified.

Specified by:
  `windowIconified` in interface `WindowListener`
Parameters:
  `e` - the event to be processed
See Also:
  - `Window.setIconImage(java.awt.Image)`

### windowDeiconified

public void windowDeiconified(WindowEvent e)
Invoked when a window is de-iconified.

Specified by:
  `windowDeiconified` in interface `WindowListener`
Parameters:
  `e` - the event to be processed

### windowActivated

public void windowActivated(WindowEvent e)
Invoked when a window is activated.

Specified by:
  `windowActivated` in interface `WindowListener`
Parameters:
  `e` - the event to be processed

### windowDeactivated

public void windowDeactivated(WindowEvent e)
Invoked when a window is de-activated.

Specified by:
  `windowDeactivated` in interface `WindowListener`
Parameters:
  `e` - the event to be processed

### windowStateChanged

public void windowStateChanged(WindowEvent e)
Invoked when a window state is changed.

Specified by:
  `windowStateChanged` in interface `WindowStateListener`
Parameters:
  `e` - the event to be processed
Since:
  1.4

### windowGainedFocus

public void windowGainedFocus(WindowEvent e)
Invoked when the Window is set to be the focused Window, which means that the Window, or one of its subcomponents, will receive keyboard events.

Specified by:
  `windowGainedFocus` in interface `WindowFocusListener`
Parameters:
  `e` - the event to be processed
Since:
  1.4

### windowLostFocus

public void windowLostFocus(WindowEvent e)
Invoked when the Window is no longer the focused Window, which means that keyboard events will no longer be delivered to the Window or any of its subcomponents.

Specified by:
  `windowLostFocus` in interface `WindowFocusListener`
Parameters:
  `e` - the event to be processed
Since:
  1.4