Java Swing Message Box

How To Display Message Box In Java

import java.awt.*;

import java.awt.event.*;

import javax.Swing.*;

public class MessageBoxes extends JFrame

{

private JPanel panel;

public MessageBoxes()

{

setTitle("Message Boxes");

panel=new JPanel();

JOptionPane.showMessageDialog(panel,"could not open file","ERROR");

JOptionPane.ERROR_MESSAGE);

JOptionPane.showMessageDialog(panel,"Information Message","Information",JOption pane.INFORMATION_MEASSAGE);

JOptionPane.showMessageDialog(panel,"Warning Message","warning",JOptionPane.WARNING_MESSAGE);

JOptionPane.showMessageDialog(panel,"Question Message","Information",JOption pane.QUESTION_MEASSAGE);

JOptionPane.showMessageDialog(panel,"palinMessage","plain",JOptionPane,PLAIN_,MESSAGE);

setSize(300,200);

setLocationRelativeto(null);

setDefaultCloseOperation(EXIT_ON_CLOSE);

setVisible(true);

}

public Static void main(String[] args)

{

new MessageBoxes();

}