# Class MouseAdapter

java.lang.Object
java.awt.event.MouseAdapter

All Implemented Interfaces:
  `MouseListener, MouseMotionListener, MouseWheelListener, EventListener`

Direct Known Subclasses:
  `BasicComboPopup.InvocationMouseHandler, BasicComboPopup.ListMouseHandler, BasicFileChooserUI.DoubleClickListener, BasicScrollBarUI.ArrowButtonListener, BasicScrollBarUI.TrackListener, BasicSplitPaneDivider.MouseHandler, BasicTabbedPaneUI.MouseHandler, BasicTreeUI.MouseHandler, FormView.MouseEventListener, HTMLEditorKit.LinkController, MetalFileChooserUI.SingleClickListener, MouseInputAdapter, ToolTipManager`

public abstract class MouseAdapter extends Object implements MouseListener, MouseWheelListener, MouseMotionListener
An abstract adapter class for receiving mouse events. The methods in this class are empty. This class exists as convenience for creating listener objects.

Mouse events let you track when a mouse is pressed, released, clicked, moved, dragged, when it enters a component, when it exits and when a mouse wheel is moved.

Extend this class to create a `MouseEvent` (including drag and motion events) or/and `MouseWheelEvent` listener and override the methods for the events of interest. (If you implement the `MouseListener`, `MouseMotionListener` 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 `addMouseListener` `addMouseMotionListener`, `addMouseWheelListener` methods. The relevant method in the listener object is invoked and the `MouseEvent` or `MouseWheelEvent` is passed to it in following cases:

- when a mouse button is pressed, released, or clicked (pressed and released)
- when the mouse cursor enters or exits the component
- when the mouse wheel rotated, or mouse moved or dragged

Since:
  1.1
See Also:
  - `MouseEvent`
  - `MouseWheelEvent`
  - `MouseListener`
  - `MouseMotionListener`
  - `MouseWheelListener`
  - Tutorial: Writing a Mouse Listener

## Constructor Summary

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

## Method Summary

Modifier and Type
Method
Description
`void`
`mouseClicked(MouseEvent e)`
Invoked when the mouse button has been clicked (pressed and released) on a component.
`void`
`mouseDragged(MouseEvent e)`
Invoked when a mouse button is pressed on a component and then dragged.
`void`
`mouseEntered(MouseEvent e)`
Invoked when the mouse enters a component.
`void`
`mouseExited(MouseEvent e)`
Invoked when the mouse exits a component.
`void`
`mouseMoved(MouseEvent e)`
Invoked when the mouse cursor has been moved onto a component but no buttons have been pushed.
`void`
`mousePressed(MouseEvent e)`
Invoked when a mouse button has been pressed on a component.
`void`
`mouseReleased(MouseEvent e)`
Invoked when a mouse button has been released on a component.
`void`
`mouseWheelMoved(MouseWheelEvent e)`
Invoked when the mouse wheel is rotated.

### Methods declared in class Object

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

## Constructor Details

### MouseAdapter

protected MouseAdapter()
Constructs a `MouseAdapter`.

## Method Details

### mouseClicked

public void mouseClicked(MouseEvent e)
Invoked when the mouse button has been clicked (pressed and released) on a component.

Specified by:
  `mouseClicked` in interface `MouseListener`
Parameters:
  `e` - the event to be processed

### mousePressed

public void mousePressed(MouseEvent e)
Invoked when a mouse button has been pressed on a component.

Specified by:
  `mousePressed` in interface `MouseListener`
Parameters:
  `e` - the event to be processed

### mouseReleased

public void mouseReleased(MouseEvent e)
Invoked when a mouse button has been released on a component.

Specified by:
  `mouseReleased` in interface `MouseListener`
Parameters:
  `e` - the event to be processed

### mouseEntered

public void mouseEntered(MouseEvent e)
Invoked when the mouse enters a component.

Specified by:
  `mouseEntered` in interface `MouseListener`
Parameters:
  `e` - the event to be processed

### mouseExited

public void mouseExited(MouseEvent e)
Invoked when the mouse exits a component.

Specified by:
  `mouseExited` in interface `MouseListener`
Parameters:
  `e` - the event to be processed

### mouseWheelMoved

public void mouseWheelMoved(MouseWheelEvent e)
Invoked when the mouse wheel is rotated.

Specified by:
  `mouseWheelMoved` in interface `MouseWheelListener`
Parameters:
  `e` - the event to be processed
Since:
  1.6
See Also:
  - `MouseWheelEvent`

### mouseDragged

public void mouseDragged(MouseEvent e)
Invoked when a mouse button is pressed on a component and then dragged. `MOUSE_DRAGGED` events will continue to be delivered to the component where the drag originated until the mouse button is released (regardless of whether the mouse position is within the bounds of the component).

Due to platform-dependent Drag&Drop implementations, `MOUSE_DRAGGED` events may not be delivered during a native Drag&Drop operation.

Specified by:
  `mouseDragged` in interface `MouseMotionListener`
Parameters:
  `e` - the event to be processed
Since:
  1.6

### mouseMoved

public void mouseMoved(MouseEvent e)
Invoked when the mouse cursor has been moved onto a component but no buttons have been pushed.

Specified by:
  `mouseMoved` in interface `MouseMotionListener`
Parameters:
  `e` - the event to be processed
Since:
  1.6