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SWING - Event Classes
SWING - Event Classes
Event classes represent the event. Java provides various Event classes, however, only those which are more frequently used will be discussed.
EventObject Class
It is the root class from which all event state objects shall be derived. All Events are constructed with a reference to the object, the source, that is logically deemed to be the object upon which the Event in question initially occurred upon. This class is defined in java.util package.
Class Declaration
Following is the declaration for java.util.EventObject class −
pubpc class EventObject
extends Object
implements Seriapzable
Field
Following are the fields for java.util.EventObject class −
protected Object source − The object on which the Event initially occurred.
Class Constructors
| Sr.No. | Constructor & Description |
|---|---|
| 1 |
EventObject(Object source) Constructs a prototypical Event. |
Class Methods
| Sr.No. | Method & Description |
|---|---|
| 1 |
Object getSource() The object on which the Event initially occurred. |
| 2 |
String toString() Returns a String representation of this EventObject. |
Methods Inherited
This class inherits methods from the following class −
java.lang.Object
SWING Event Classes
Following is the pst of commonly used Event classes.
| Sr.No. | Class & Description |
|---|---|
| 1 |
It is the root event class for all SWING events. This class and its subclasses supercede the original java.awt.Event class. |
| 2 |
The ActionEvent is generated when the button is cpcked or the item of a pst is double-cpcked. |
| 3 |
The InputEvent class is the root event class for all component-level input events. |
| 4 |
On entering the character the Key event is generated. |
| 5 |
This event indicates a mouse action occurred in a component. |
| 6 |
The object of this class represents the change in the state of a window. |
| 7 |
The object of this class represents the adjustment event emitted by Adjustable objects. |
| 8 |
The object of this class represents the change in the state of a window. |
| 9 |
The object of this class represents the change in the state of a window. |
| 10 |
The object of this class represents the change in the state of a window. |
| 11 |
The object of this class represents the change in the state of a window. |