if you want to generate a javadoc for a specific method in eclipse then just move your cursor one line above that particular method of a class and type /** and press enter key...am not sure if you are expecting for the same....
I would suggest you set up a template for a method, and include the /** ...@param...@return...@etc... */ in that template. Also put $ tags for name of method, parameters, method body etc in the template. Rather than writing the name of the method, you can use an abbreviation, and Eclipse will give you the skeleton for a method ready-made.
When you use the new class wizard in Eclipse, there is a link on it. It says "configure templates and default values here". You can probably set templates for new comments there.
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