EventListener Interfaces

EventListener Interfaces

Posted in : Core Java Posted on : October 25, 2010 at 7:05 PM Comments : [ 0 ]

This section contains the detail about the EventListener Interfaces in java.

EventListener Interfaces

An event listener registers with an event source to receive notifications about the events of a particular type.
Various event listener interfaces defined in the java.awt.event package are given below :

 Interface         Description
ActionListener Defines the actionPerformed() method
to receive and process action events.
MouseListener Defines five methods to receive mouse
events, such as when a mouse is
clicked, pressed, released, enters, or
exits a component
MouseMotionListener Defines two methods to receive
events, such as when a mouse is
dragged or moved.
AdjustmentListner Defines the adjustmentValueChanged()
method to receive and process the
adjustment events.
TextListener Defines the textValueChanged()
method to receive and process an
event when the text value changes.
WindowListener Defines seven window methods to
receive events.
ItemListener Defines the itemStateChanged()
method when an item has been
selected or deselected by the user.

Example :

The following code shows the generation of an action event and its handling by the ActionListener interface :

package corejava;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class ActionListenerDemo extends JFrame implements ActionListener {
	JButton b1, b2;
	JLabel lbl;
	int clicked;
	final String str = " Number of times button clicked = ";

	public ActionListenerDemo(String strName) {
		getContentPane().setLayout(new FlowLayout());
		JPanel p = new JPanel();
		b1 = new JButton("Click Me");
		b2 = new JButton("Quit");
		p.setLayout(new FlowLayout());
		lbl = new JLabel(str + clicked, JLabel.CENTER);

	public void actionPerformed(ActionEvent ae) {
		String s = ae.getActionCommand();
		if ("Click Me".equals(s)) {
			lbl.setText(str + clicked);
		if ("Quit".equals(s)) {

	public static void main(String args[]) {
		ActionListenerDemo t = new ActionListenerDemo("Action Events");
		t.setSize(300, 300);


Output :

It will display the number of time you clicked "Click Me" button :

Download Source Code

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