Swing (Java)

 import javax.swing.*;

 public class HelloWorld { 
     public static void main(String[] args) {
         SwingUtilities.invokeLater(new Runnable() { public void run() {
             JFrame frame = new JFrame("Hello, World!");
             frame.setDefaultCloseOperation (JFrame.DISPOSE_ON_CLOSE);
             frame.add(new JLabel("Hello, World!"));
             frame.pack();
             frame.setVisible(true);
         } });
     }
 }