package com.c4learn.swing;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class JButtonDemo {
  private JFrame mainFrame;
  private JLabel headLabel;
  private JLabel msgLabel;
  private JPanel mainPanel;
  public JButtonDemo() {
    mainFrame = new JFrame("Java Swing Examples");
    mainFrame.setSize(300, 300);
    mainFrame.setLayout(new GridLayout(3, 1));
    headLabel = new JLabel("JButton Class", JLabel.CENTER);
    msgLabel = new JLabel("No Action", JLabel.CENTER);
    mainPanel = new JPanel();
    mainPanel.setLayout(new FlowLayout());
    mainFrame.add(headLabel);
    mainFrame.add(mainPanel);
    mainFrame.add(msgLabel);
    mainFrame.setVisible(true);
  }
  public static void main(String[] args) {
    JButtonDemo swingControlDemo = new JButtonDemo();
    swingControlDemo.showButtonDemo();
  }
  private void showButtonDemo() {
    JButton okButton = new JButton("OK");
    JButton submitButton = new JButton("Submit");
    JButton cancelButton = new JButton("Cancel");
	//Listner for OK Button
    okButton.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        msgLabel.setText("Ok Button clicked.");
      }
    });
	//Listner for Submit Button
    submitButton.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        msgLabel.setText("Submit Button clicked.");
      }
    });
	//Listner for Cancel Button
    cancelButton.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        msgLabel.setText("Cancel Button clicked.");
      }
    });
    mainPanel.add(okButton);
    mainPanel.add(submitButton);
    mainPanel.add(cancelButton);
    mainFrame.setVisible(true);
  }
}

Output :