import java.awt.Dimension;
import java.awt.Toolkit;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class HelloWorld {

  /* Create the GUI and show it.  For thread safety,
   * this method should be invoked from the
   * event-dispatching thread.
   */
  private static void createAndShowGUI() {
    //Create and set up the window.
    JFrame frame = new JFrame("Hello World");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();
    frame.setBounds(0, 0, dim.width/2, dim.height/2);


    //Add the ubiquitous "Hello World" label.
    JLabel label = new JLabel("Hello World");
    JPanel panel = new JPanel();
    panel.setBorder(BorderFactory.createEmptyBorder(30, 10, 30, 30));
    panel.add(label);

    frame.getContentPane().add(panel);

    //Display the window.
    frame.setVisible(true);
  }

  public static void main(String[] args) {
    //Schedule a job for the event-dispatching thread:
    //creating and showing this application's GUI.
    javax.swing.SwingUtilities.invokeLater(new Runnable() {
      public void run() {
        createAndShowGUI();
      }
    });
  }
}