Www.jdocs.com A Java API query site, after all Java APIs, use and manage APIs into a painful thing. You have to include a big pile of html files, click on each index.html and then find it. This site solves this problem and collects all kinds of Java developed APIs, providing queries, let you find it, no longer worry.
And he also provides an Eclipse plugin that allows Eclipse unlimited extension of the help API. It is more simple to do a Java DOCS plug-in than yourself. Oh, good things!
Similar sites are javadoconline.com