IN 1990, JAVATM LANGUAGE was conceived as programming language for navigating on the WWW pages (World Wide Web) of the internet network. HTML language (HyperText Markup Language) being the format of the WWW pages, the aim of Java is to make the network fully " client-serving ". The objective of the Java inventors is to lead the way (at least theoretically) to the production of interactive codes which may be executed on different processors without recompiling. Java is based on the concept "byte-codes" interpretable on "virtual machines" available on any platform. It is more supple than C++ language and is close to the language Smalltalk. During the past few years, Java has finally proven to be a true and valuable object-oriented programming tool.