Roll I am in the same boat. I have content support that automatically activates with every letter, because I find it extremely useful that way, but I have the same problem with int (eger) that you do.
I came up with several ways to handle this and thought that I would share them if you find one of them useful.
You can use Type Filter, since the proposed ralph works very well, you just do not get help when you really want Integer, which is not so important for the deal.
You can delay the content help long enough so that you can type "int" and type before it appears, which always gives you a delay. (In the settings-> Java-> Editor-> Content Assist there is a setting for automatic activation)
Or remove the 'i', 'n' and 't' from the automatic activation triggers (again in Preferences-> Java-> Editor-> Content Assist). This is the method I'm trying now, and seems to work with everything, even Integer, saving me the trouble of typing "ger" :).
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