How to import a .class in eclipse?

I have a .class file w/ out the source, and im tiring to import that into my project.
So I go to import->File System and check the .class file. It shows up in my project but when I try to instantiate it I get a "can not be instantiated to a type" error.
any thoughts?
this is happening to a lot of people in my course.
thanks!

Hi,
i tried that what you sad, but my eclipse can't import that class.
So: I have eclipse 3.1, and i would like to import a class (without source). I develop at the moment a J2ME project with eclipse.
The class what i want to import is in a package, so i must to import like this: import net.jscience.math.kvm.MathFP;
Can you tell me how in the hell can i this class to import?
(I tried about 6 hours long, and i got some result, but not the really perfect.)
When i make this subdirectory structure (what is in the import line) into my project, then in eclipse work the auto completing, 'till the class name. :-/. But the class is there. Egal i add an external class folder, i got always the same result.
Please help me, because my brain at the moment wants to explode.
Thanks a lot.

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