A simple JFrame window:

   import java.awt.*;
   import java.awt.event.*;
   import javax.swing.*;
   
   public class SampleWin3
   {
      public static void main(String [] args)
      {
         JFrame frame = new JFrame("Alan Window");
         frame.setSize(250, 80);
         frame.setLocation(20, 20);
         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         frame.setVisible(true);
      }
   }