See definition 2, stukov. It will help you get the joke:
java
noun
- an island in Indonesia to the south of Borneo; one of the world's most densely populated regions
- a beverage consisting of an infusion of ground coffee beans; "he ordered a cup of coffee" [syn: coffee]
- a platform-independent object-oriented programming language
WordNet® 3.0, © 2006 by Princeton University.
"java."
WordNet® 3.0. Princeton University. 19 Jun. 2008. <Dictionary.com
http://dictionary.reference.com/browse/java>.