https://javafiddle.leaningtech.com

  public class JavaFiddle
  {
    public static void main(String[] args)
    {
      System.out.println("HelloWorld!");
    }
  }

  import java.awt.Font;
  import javax.swing.JFrame;
  import javax.swing.JLabel;
  import javax.swing.SwingUtilities;

  public class JavaFiddle implements Runnable
  {
    private String text;
    public JavaFiddle(String t)
    {
      text = t;
    }
    public void run()
    {
      JFrame f = new JFrame("Swing Sample");
      JLabel l = new JLabel(text);
      l.setFont(new Font("Serif", Font.PLAIN, 42));
      f.add(l);
      f.pack();
      f.setLocationRelativeTo(null);
      f.setVisible(true);
    }
    public static void main(String[] args)
    {
      SwingUtilities.invokeLater(new JavaFiddle("HelloWorld!"));
    }
  }

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