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Opened a LinkedHashSet source code today and found some interesting thing:
public class LinkedHashSet<E>
extends HashSet<E>
implements Set<E>, Cloneable, java.io.Serializable {
The question is: why do they need both “extends HashSet” and “implements Set” when HashSet already is the Set?
I’ve asked Josh Bloch, and he informs me that it was a mistake. He used to think, long ago, that there was some value in it, but he since “saw the light”. Clearly JDK maintainers haven’t considered this to be worth backing out later.