Online documentation

The Java language and libraries from Sun Microsystems (a free download) come with
documentation in electronic form, readable using a Web browser, and virtually every third
party implementation of Java has this or an equivalent documentation system. Almost all
the books published on Java have duplicated this documentation. So you either already have
it or you can download it, and unless necessary, this book will not repeat that
documentation because it’s usually much faster if you find the class descriptions with your
Web browser than if you look them up in a book. (Plus it will be up-to-date.) This book will
provide extra descriptions of the classes only when it’s necessary to supplement the
documentation so you can understand a particular example.