This Web site provides various Java documentations converted to Windows Help format.
WinHelp and HtmlHelp systems provides a structured table of contents, a complete index, and a full-text search feature. Don't remember the parameters of StringBuffer.replace() ? Just type 'replace' in the index, and you get it in a snap. Alternatively, you can browse the table of contents tree to find the StringBuffer class methods. All the documentation is packaged in a single CHM file, and is instantly available, even if you're offline.
It saves me hours of API browsing. I hope it will be the same for you.
Please click : http://www.allimant.org/javadoc/index.php if you need it.