Saturday, July 20, 2013


Button is a component class in AWT package. When a button is pushed, an action can happen. An application that wants to perform some action when the button is pushed has to implement ActionLister interface and registers the new listener to receive events from the button by calling the addActionListener(ActionListener listener) method. The code to perform actions when the button is pushed will be placed in the actionPerformed(ActionEvent e) method of the ActionLister interface.

Constructors of Button class:
creates a button with empty label.
-Button(String label)
creates a button with string label.
Useful methods of Button class:
-addActionListener(ActionListener listener): void
registers the new listener to receive events from the button.
-getLabel(): String
reads the label on the button.
-setLabel(String label): void
  set the label to the button.


import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Dimension;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Label;
import java.awt.Panel;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.image.BufferedImage;

import javax.imageio.ImageIO;
class ShowImage extends Label{
BufferedImage bi=null;
public void paint(Graphics g){

public void loadImage(String filename){
try{ File(filename));
}catch(IOException ie){System.out.println("Can't read the image file");}

class InterfaceShow extends Frame implements ActionListener{
InterfaceShow(String title){
setSize(new Dimension(350,300));
setLayout(new BorderLayout());
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
Button btshow=new Button("Show image");
Panel panel=new Panel();
add(panel, BorderLayout.NORTH);


public void actionPerformed(ActionEvent e){
ShowImage si=new ShowImage();

public class AWTControls {
public static void main(String[] args){
new InterfaceShow("Using Button");

button java


  1. Is it possible to perform click action automatically on a button in a specified time interval?

  2. Yes, it is possible. The steps below can help you to cause action on a button automatically in a specified time delay.
    1. Create a class that implements the ActionListener interface and override its actionPerformed(ActionEvent e) method.
    class ActList implements ActionListener{
    public void actionPerformed(ActionEvent e){
    //code to do sth when the button is pushed
    2. Create an object of the ActList class and supply it to the addActionListener (ActionListener list) method of the button. Then create a timer object that takes time delay and ActList object. You can start the timer by using its start method.
    Button bt=new Button("Auto click button");
    ActList al=new ActList();
    Timer timer=new Timer(2000,al);//delay 2 seconds
    timer.setRepeats(false);//fire action only one time
    timer.start();//start the timer

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