Principles of Programming: Java Level 1 is a minimalist computer science textbook, designed for a short, intensive, beginner-level coding course. Unlike other textbooks, this book does not attempt to cover all of Java. The book starts you off with "Hello World," gradually adding new concepts, in order of increasing complexity. Topics covered include screen output, information storage and processing, user input, Boolean logic and decision making, and looping. After learning all the concepts, you get to build a simple game. Finally, the book features a guide to getting help and the definitions of its few technical terms.