My first Java GUI application.

MyClass.java

package it.penpen.java.myproject;

import java.awt.FlowLayout;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingUtilities;

public class MyClass implements Runnable {

    public static void main(String[] args) {
        FlowLayout layout = new FlowLayout();
        
        JLabel label = new JLabel("Hello, world.");
        
        JButton button = new JButton("Click me.");

        JFrame frame = new JFrame("Hello, world.");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLayout(layout);
        frame.add(label);
        frame.add(button);
        frame.pack();
        frame.setVisible(true);
    }

    @Override
    public void run() {
        MyClass my = new MyClass();
        
        SwingUtilities.invokeLater(my);
    }

}