Eclipse doesn't recognize custom classes despite correct setup

Question

I have the following setup in my project:

com.foo
 - Main
com.foo.util
 - StringUtil

In Main I import the StringUtil using

package com.foo;
import com.foo.util.StringUtil;

And use it just as you would use it;

StringUtil string = new StringUtil();

Yet, eclipse keeps telling me that StringUtil cannot be resolved to a type - how can this be?

I already tried refreshing the project, reimporting it as a new project, clicked through the build paths but everything seems to be set up correctly.

But still, eclipse doesn't recognize the class and won't compile my project.

Answer 1

EDIT: The original question had this format:

package com.foo;
import com.foo.StringUtil;

Thus my answer was:

Because StringUtil is in com.foo.util and not in com.foo.

Change it to import com.foo.util.StringUtil.