This book is an introduction to the Java programming language, a tutorial based on 76 short Java programs, each one of them no longer than a single page. I believe that an introduction to any programming language has to be based on short programs, short enough that the readers will type all of them with their own hands, line by line, before compiling and executing them. The important computer science concepts are first introduced (theoretically) and then applied (practically) with the help of these 76 short Java examples. In this way the readers will master all the Java topics required for the OOP option of the International Baccalaureate Computer Science exam.