import javax.swing.*;

public class Test extends Object{
    static {
        executingClass();
    }

    private static void executingClass(){
        System.out.println("Creating a GUI.");

        JFrame frame = new JFrame("Test");
        frame.setSize(200, 200);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }

    public static void doSomethingElse(){
        System.out.println("Changing some variables...");
    }

    public static void main(String... args){
        // Doing nothing but the main method is requiered.
    }
}