Event handling in Java AWT
Introduction
In this section, you will learn how to handle events in java awt. Here, this
is done through the java.awt.*; package
of java. Events are the integral
part of the java platform. You can see the concepts related to the event
handling through this example and used methods through which you can implement
the event driven application.
This example shows you how to handle events in java.awt.*;
package.
AwtEvent is the main class of the program which
extends from the Frame class implements the ActionListener
interface.
This program starts to run from the main method in which the object for the
AwtEvent class has been created. The constructor of the AwtEvent class creates two buttons with adding the addActionListener()
method to it. The constructor also initializes a label with text "Roseindia.net".
When you click on the button then the actionPerformed()
method is called which receives the generated event. This method shows the text of the
source of the event on the label.
Here is the code of the program :
import java.awt.*;
import java.awt.event.*;
public class AwtEvent extends Frame implements ActionListener{
Label lbl;
public static void main(String argv[]){
AwtEvent t = new AwtEvent();
}
public AwtEvent(){
super("Event in Java awt");
setLayout(new BorderLayout());
try{
Button button = new Button("INSERT_AN_URL_HERE");
button.addActionListener(this);
add(button, BorderLayout.NORTH);
Button button1 = new Button("INSERT_A_FILENAME_HERE");
button1.addActionListener(this);
add(button1, BorderLayout.SOUTH);
lbl = new Label("Roseindia.net");
add(lbl, BorderLayout.CENTER);
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent we){
System.exit(0);
}
});
}
catch (Exception e){}
setSize(400,400);
setVisible(true);
}
public void actionPerformed(ActionEvent e){
Button bt = (Button)e.getSource();
String str = bt.getLabel();
lbl.setText(str);
}
}
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