Why does LinkedHashSet extend HashSet and implement Set

Question

Opened a LinkedHashSet source code today and found some interesting thing:

public class LinkedHashSet
    extends HashSet
    implements Se         


        

Answer 1

Perhaps it has something to do with the way javadoc gets generated. You know how Java API tells you all concrete classes that impement an interface or inherit from other classes? While I agree that at runtime its redundant, I can see how this might ease the automatic generation of javadoc. This is just a wild guess of course.