if HashSet is extending Abstract set then why it needs to implement Set?

Asked Apr 11 '16 at 18:15

Active Apr 11 '16 at 18:15

Viewed 48 times

The below code is bit confusing. AbstractSet already implements Set. So the question is if HashSet is extending Abstract set then why it needs to implement Set?

public class HashSet<E>
extends AbstractSet<E>
implements Set<E>, Cloneable, java.io.Serializable

asked Apr 11 '16 at 18:15

Kulbhushan Singh

2

For clarity of the API. – Boris the Spider Apr 11 '16 at 18:18
1

It does not **need** to redeclare that it implements Set, but it does redeclare... :- ) – ericbn Apr 11 '16 at 18:19
5

http://stackoverflow.com/questions/2165204/why-does-linkedhashsete-extend-hashsete-and-implement-sete – Akceptor Apr 11 '16 at 18:20

if HashSet is extending Abstract set then why it needs to implement Set?

0 Answers0