Creating an Applet

Create an Applet
Select New from the file menu
Select Applet from the New tab.
File in the Project dialog
The first Application Wizzard window allows you to set libraries and whether or not this can run as a standalone. Delete the package name (circled), so you can easily use in a HTML document anywhere.
If you want your project to run both as an applet and an application make sure to check the can run alone checkbox. Make sure to add the following code to the end of the main (note here that frame is the name of the JFrame generated by the program. Without this code your application will not close properly. 
    frame.addWindowListener(
      new  WindowAdapter(){
        public void  windowClosing(WindowEvent e)
        {
          System.exit(0);
        }
      }
    );
The second Wizzard window allows you to create parameters
The third Wizzard window allows you to create a test HTML file to run your applet in.

Modify Code to Eliminate Swing

You may not want to use swing classes since many browsers don't have the swing plugin, to eliminate it. First delete the import javax.swing.* statement and change from a JApplet to an Applet.

import  java.applet.*;
importjavax.swing.*; < **********delete this 
   
public class  Random extends  JApplet {< ********* get rid of the J

In the body of the code, eliminate the "look and feel" section of the code.

  // static initializer for setting look & feel
   static  {
    try  {
      UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
      //UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
     }
    catch  (Exception e) {}
  }