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 - Retired Exploring the Java Collection Framework Sets

Adarsh Cavale
Adarsh Cavale
2,262 Points

You said Set is an interface. How come you don't have to implement the interface?

Wouldnt you have to put something in the Example class like "implements ..." like how we did in the Treet class for "implements Comparable, Serializable" ?

1 Answer

We are using another class that implements the Set interface; in the source code of this one, we would find the implements Set line. If we wanted to create our own Set implementation, we would indeed need to implement the interface.