Java Event

This code will show on how to make Java Event:

import javax.swing.JFrame;

import javax.swing.JButton;

import javax.swing.JOptionPane;

import java.awt.FlowLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

public class Main{

    public static void main(String[] args){

         new Main();

    }

    public Main(){

        frame = new JFrame("Event Application");

        bDialog = new JButton("Show Dialog");

        bDialog.addActionListener(new ActionListener(){

            public void actionPerformed(ActionEvent ae){

                JOptionPane.showMessageDialog( frame,

                                         "Holla World");

            }

        });

        frame.add(bDialog);

        frame.setLayout(new FlowLayout(FlowLayout.CENTER));

        frame.setSize(400, 300);    

        frame.setLocation(200, 100); 

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        frame.setVisible(true);

    }

    private JFrame frame;

    private JButton bDialog;

}

Java Event