SWING - JButton Class

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Introduction

The class JButton is an implementation of a push button. This component has a label and generates an event when pressed. It can also have an Image.

Class Declaration

Following is the declaration for javax.swing.JButton class −

public class JButton
   extends AbstractButton
      implements Accessible

Class Constructors

Class Methods

Methods Inherited

This class inherits methods from the following classes −

• javax.swing.AbstractButton
• javax.swing.JComponent
• java.awt.Container
• java.awt.Component
• java.lang.Object

JButton Example

Create the following Java program using any editor of your choice in say D:/ > SWING > com > tutorialspoint > gui >

SwingControlDemo.java

package com.tutorialspoint.gui;
 
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
 
public class SwingControlDemo {
   private JFrame mainFrame;
   private JLabel headerLabel;
   private JLabel statusLabel;
   private JPanel controlPanel;

   public SwingControlDemo(){
      prepareGUI();
   }
   public static void main(String[] args){
      SwingControlDemo  swingControlDemo = new SwingControlDemo();      
      swingControlDemo.showButtonDemo();
   }
   private void prepareGUI(){
      mainFrame = new JFrame("Java Swing Examples");
      mainFrame.setSize(400,400);
      mainFrame.setLayout(new GridLayout(3, 1));
      
      mainFrame.addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent windowEvent){
            System.exit(0);
         }        
      });    
      headerLabel = new JLabel("", JLabel.CENTER);        
      statusLabel = new JLabel("",JLabel.CENTER);    
      statusLabel.setSize(350,100);

      controlPanel = new JPanel();
      controlPanel.setLayout(new FlowLayout());

      mainFrame.add(headerLabel);
      mainFrame.add(controlPanel);
      mainFrame.add(statusLabel);
      mainFrame.setVisible(true);  
   }
   private static ImageIcon createImageIcon(String path, String description) {
      java.net.URL imgURL = SwingControlDemo.class.getResource(path);
      if (imgURL != null) {
         return new ImageIcon(imgURL, description);
      } else {            
         System.err.println("Couldn't find file: " + path);
         return null;
      }
   }   
   private void showButtonDemo(){
      headerLabel.setText("Control in action: Button"); 

      //resources folder should be inside SWING folder.
      ImageIcon icon = createImageIcon("/resources/java_icon.png","Java");

      JButton okButton = new JButton("OK");        
      JButton javaButton = new JButton("Submit", icon);
      JButton cancelButton = new JButton("Cancel", icon);
      cancelButton.setHorizontalTextPosition(SwingConstants.LEFT);   

      okButton.addActionListener(new ActionListener() {
         public void actionPerformed(ActionEvent e) {
            statusLabel.setText("Ok Button clicked.");
         }          
      });
      javaButton.addActionListener(new ActionListener() {
         public void actionPerformed(ActionEvent e) {
            statusLabel.setText("Submit Button clicked.");
         }
      });
      cancelButton.addActionListener(new ActionListener() {
         public void actionPerformed(ActionEvent e) {
            statusLabel.setText("Cancel Button clicked.");
         }
      });
      controlPanel.add(okButton);
      controlPanel.add(javaButton);
      controlPanel.add(cancelButton);       

      mainFrame.setVisible(true);  
   }
}

Compile the program using the command prompt. Go to D:/ > SWING and type the following command.

D:\SWING>javac com\tutorialspoint\gui\SwingControlDemo.java

If no error occurs, it means the compilation is successful. Run the program using the following command.

D:\SWING>java com.tutorialspoint.gui.SwingControlDemo

Verify the following output.