import javax.swing.JFrame;
import javax.swing.JLabel;
 
public final class SwingHelloWorld {
 
    public static void main(final String[] args) {
       JFrame frame = new JFrame("Hello, World!");
 
       frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
 
       frame.add(new JLabel("Hello, World!"));
 
       frame.pack();

       frame.setLocationRelativeTo(null);
       
       frame.setVisible(true);
    }
}