免费的Java电子书籍和技术文章:
http://java.sun.com/docs/books/jls/second_edition/Html/j.title.doc.html
Java语言规范 - 第二版 - This book attempts a complete specification of the syntax and semantics of the language. We intend that the behavior of every language construct is specified here, so that all implementations will accept the same programs.
http://www.artima.com/objectsandjava/webuscript/index.html
对象与Java:使用Java来构建面向对象的,多线称的应用程序 - by Bill Venners - this free book is a work-in-progress.
http://books.iuniverse.com/viewbooks.asp?isbn=15834821801&page=1
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