What is action event? How it is handled in Java? Explain with suitable Java source

 Handling Action Events

The class Action Event is defined in java.awt.event package. The ActionEvent is generated when the button is clicked or the item of a list is double-clicked. The object that implements the ActionListener interface gets this ActionEvent when the event occurs and hence must handle the event by overriding the action Performed() method of ActionListener interface.

Example

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

public class Event Test extends JFrame implements ActionListener

{

private JTextField ti, t2, t3;

JLabel 11,12,13;

JButton b1,b2;

public EventTest()

{

super("Handling Action Event");

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 11 new JLabel("First Value: ");

12= new JLabel("Second Value:"); 13 = new JLabel("Result: ");

t1 = new JTextField(10);

t2 = new JTextField(10);

t3 = new JTextField(10);

b1= new JButton("Add"); b2 = new JButton("Subtract");

bl.addActionListener(this); b2.addActionListener(this);

setLayout (new FlowLayout (FlowLayout.LEFT,150,10));

add (11);

add (t1);

add (12);

add (t2);

add (13);

add (t3);

add (b1);

add (b2);

setSize(400, 300);

setVisible (true);

}

public void action Performed (ActionEvent ae)

{

int x, y, z;

x = Integer.parseInt(t1.getText()); y = Integer.parseInt(t2.getText());

if(ae.getAction Command () == "Add")

z = x + y;

else

z = x - y; t3.setText(String.valueOf(z));

}

public static void main(String a []) {

new EventTest();

}

}