Code completion is one of the most basic features of a language sensitive IDE.
Ctrl + Space and Eclipse would be of immediate help.
But Eclipse takes it one step further.
f and then
Ctrl + Space brings in window for completion.
Ctrl + Space again cycles through types of completions. In
this case its for Code Templates.
:: also activates content assist
automatically. This behavior can be configured via
Word completions takes context sensitivity one step backward. (Or maybe
forward.) It does not depend on context sensitive information. Pressing
Alt + / would complete current word. The most important usage would
be within comments. Where in you may want to explain about some
functions/variables. The function name would not be context sensitive within
the comment region but the word would still complete itself.