java.Net or java.Net.URL

Greetings!

I am trying to locate the java.Net file to import for this WIKI:

http://wiki.sdn.sap.com/wiki/display/xi/file%2blookup%2bin%2budf?bc=true

I got the PI error that these were missing ...

I've looked all over Google and even on the JDK and JRE folders on my machine but can't locate it.

Can anyone suggest where else I might consider?