The basics - what goes into an applet

import java.awt.*;
import java.applet.*;

public class SimpleApplet extends Applet
{
	public void init()
	{
	}

	public void paint( Graphics g)
	{
	}

	public void destroy()
	{
	}
}

how to add an applet to a HTML page

<APPLET CODE=applet.class WIDTH=width HEIGHT=height>
<PARAM NAME=name1 VALUE=value1>
<PARAM NAME=name2 VALUE=value2>
<PARAM NAME=name3 VALUE=value3>
...
</APPLET>

However many sites disable java at the firewall so your applet may not appear to work in these cases. Most firewalls prevent java files from getting past them by looking for a ".class" extension. Both Netscape and Microsoft provide mechanisms to get around this.

• archive your class files into a zip archive, making sure that no compression is used.
• delete the class files, as they are now contained in the zip file
• change the form of the <APPLET> tag to read:

  <APPLET archive=myarchive.zip CODE=applet.class WIDTH=width HEIGHT=height> <PARAM NAME=name1 VALUE=value1> <PARAM NAME=name2 VALUE=value2> <PARAM NAME=name3 VALUE=value3> ... </APPLET>

• Use the Cabinet SDK to pack your class files into a CAB
• Add a cabbase

  <APPLET CODE=applet.class WIDTH=width HEIGHT=height> <PARAM NAME=name1 VALUE=value1> ... <PARAM NAME=cabbase VALUE=mycabinet.cab> ... </APPLET>

<PARAM>

public void init()
{
  String my_arg1, myarg2, my_arg3, ...;

  my_arg1 = getParameter("name1");
  my_arg2 = getParameter("name2");
  my_arg3 = getParameter("name3");
  ...
}

Converting parameters

public void init() {
  int value = default;

  my_arg =	getParameter("name1");
  if (my_arg == null){
	 try{
		value = Integer.parseInt(my_arg);
	 }
	 catch (NumberFormatException e) {
		value = default;
	 }
  }
}

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