Eclipse : สร้าง Java GUI และการสร้าง Event Action และ Dialog โต้ตอบแบบง่าย ๆ

		JButton btnClick = new JButton("Click");
		btnClick.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent arg0) {
					
			}
		});

		JButton btnClick = new JButton("Click");
		btnClick.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent arg0) {
				
				JOptionPane.showMessageDialog(frame,"Sawatdee : " + txtName.getText());
				
			}
		});

package com.java.myapp;

import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

public class MyWindowsForm {

	private JFrame frame;
	private JTextField txtName;

	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try {
					MyWindowsForm window = new MyWindowsForm();
					window.frame.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}

	/**
	 * Create the application.
	 */
	public MyWindowsForm() {
		initialize();
	}

	/**
	 * Initialize the contents of the frame.
	 */
	private void initialize() {
		frame = new JFrame();
		frame.setBounds(100, 100, 450, 300);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.getContentPane().setLayout(null);
		
		JLabel lblPleaseInputYour = new JLabel("Please input your name :");
		lblPleaseInputYour.setBounds(158, 54, 130, 14);
		frame.getContentPane().add(lblPleaseInputYour);
		
		txtName = new JTextField();
		txtName.setBounds(121, 79, 180, 20);
		frame.getContentPane().add(txtName);
		txtName.setColumns(10);
		
		JButton btnClick = new JButton("Click");
		btnClick.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent arg0) {
				
				JOptionPane.showMessageDialog(frame,"Sawatdee : " + txtName.getText());
				
			}
		});
		
		
		btnClick.setBounds(170, 125, 89, 23);
		frame.getContentPane().add(btnClick);
	}
}

JOptionPane.showMessageDialog(frame,
    "Eggs are not supposed to be green.");

JOptionPane.showMessageDialog(frame,
    "Eggs are not supposed to be green.",
    "Inane warning",
    JOptionPane.WARNING_MESSAGE);

JOptionPane.showMessageDialog(frame,
    "Eggs are not supposed to be green.",
    "Inane error",
    JOptionPane.ERROR_MESSAGE);

JOptionPane.showMessageDialog(frame,
    "Eggs are not supposed to be green.",
    "A plain message",
    JOptionPane.PLAIN_MESSAGE);

JOptionPane.showMessageDialog(frame,
    "Eggs are not supposed to be green.",
    "Inane custom dialog",
    JOptionPane.INFORMATION_MESSAGE,
    icon);