Quack Plugin
Quack is an Eclipse Plug-in. Once the plug-in is installed, use it by entering keywords separated by spaces, and then pressing Ctrl-Space. Quack then suggests Java expressions which contain your keywords, as shown here:

Terms and Conditions

Instructions

Update Site: http://glittle.org/quack
Feedback/Questions to: glittle@gmail.com
Check Eclipse version (3.3.0 or greater is required)
Open Find and Install... dialog
Add update site: http://glittle.org/quack
Select Quack Plug-in 0.x.x from update site
Finish installation
Try it out

Notes