This work provides an introduction to the Java programming language and also covers other related areas such as HTML, JavaScript, CGIscript and VRML. Most of the Java programs relate to practical examples, including: menus and forms; graphics; event driven software such as mouse and keyboard events; networking; interacting with other programs; and animation. It also covers fundamental areas such as TCP/IP and the HTTP protocol. The Java compiler, source code, background information and source code is available from the author over the Internet. This work is intended for students taking GCSE, GNVQ, NVQ, A Level, and further and adult education courses. It should also be useful for first year undergraduates and computing enthusiasts.