Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Java Java Data Structures Getting There Class Review

importing the java.util.date

why we have to include java.util.date class in Example.java when it is already imported in BlogPost.java

1 Answer

Seth Kroger
Seth Kroger
56,413 Points

Because classes act as black boxes, when we import BlogPost into our source we (and the compiler) will have no idea what is going on inside it, only what the public methods and fields are. The imports inside BlogPost won't cross over to other source files we import inside it. If we want to use Date in our source, we'll need to import that was well.

got it , thanks a lot man