What is event handling in the java programming?

[rashmi_ay]

Hi,

I need your help to understand the event handling concept. I know delegate very well but don't know what is exact functioning of events in java.
What is event handling in the java programming?If anybody know anything about java events then please let know that. Your help will be greatly appreciable.

[Praetor]

Hi all,

The event handling mechanism is used to represent the activities which is going on between the java program user and the java application.
Following are some stages of the event handling mechanism of Java:

1. Import java event classes by using "import java.awt.event.*;
2. Then define override class.
3. Then define an object of event listener.
e.g ButtonListener abc = new ButtonListener();
4. Finallay make registration of the object of event listener
e.g x = new Button(“submit”);

[Zecho]

Hi,

I have the java program code which will explains how to use the different events classes in the java code:

import java.awt.event.*;
import java.applet.*;
import java.awt.*;

/*
<applet code="MouseDemo" width=200 height=200>
</applet>
*/
public class MouseDemo extends Applet {

public void init()
{
setBackground(Color.Blue);
addMouseListener(new MyMouseAdp());
}

class MyMouseAdp extends MouseAdapter {

public void mouseReleased(MouseEvent be) {
setBackground(Color.yellow);
repaint();
}

public void mousePressed(MouseEvent be) {
setBackground(Color.orange);
repaint();
}

}
}

[Reegan]

Hi friends,

The basic concept of the event handling mechanism comprises "Events source", "Event Objects", "Event handler" and "Event classes". There are different methods which are used to handle the mouse events which are as follows:

*. void mousePressed(MouseEvent m)
*. void mouseReleased(MouseEvent m)
*. void mouseClicked(MouseEvent m)
*. void mouseEntered(MouseEvent m)
*. void mouseExited(MouseEvent m)