问题
I don't know what happened but the intellisense just disappeared; how to get it back? I tried creating new projects, rebooting, doesn't help.
回答1:
Did you reset the preferences of default options in 'Windows > Preferences > Java > Editor > Content Assist > Advanced', like mentioned in this answer?
回答2:
window -> preferences -> editor -> content assist
and check the completion inserts box
来源：https://stackoverflow.com/questions/2085749/intellisense-disappeared-in-eclipse-how-to-get-it-back