说明：  《Head First Java》是本完整的面向对象(object-oriented，OO)程序设计和Java的学习指导。此书是根据学习理论所设计的，让你可以从学习程序语言的基础开始一直到包括线程、网络与分布式程序等项目。最重要的，你会学会如何像个面向对象开发者一样去思考。
("Head First Java" is a complete object oriented (object-oriented, OO) programming and Java learning guide. The book is based on learning theory that allows you to start with the basics of learning programming languages, including threads, networks, and distributed programs. Most importantly, you'll learn how to think like an object-oriented developer.)