# The book shows clearly how a simple compiler can be decomposed into a syntactic analyzer, a contextual analyzer, and a code generator, communicating via an abstract syntax tree
# . The book is accompanied by a complete working compiler and interpreter, provided via the Internet, and free of charge for educational use
# . The book contains numerous exercises, together with sample answers to selected exercises. It also contains a number of suggested projects, involving extensions to the accompanying compiler
# . All examples in the book are expressed in Java, and the compiler and interpreter are structured using object-oriented design patterns