java - Is there any benefit in implementing a interface in a subclass even though the superclass implements the same interface -

when seeing declaration of arraylist

class arraylist<e> extends abstractlist<e>     implements list<e>, randomaccess, cloneable, java.io.serializable 

which implements list interface eventhough arraylist's superclass abstractlist implements same list interface.

abstract class abstractlist<e> extends abstractcollection<e> implements list<e> 

similar declarations can found on hashmap, linkedhashmap declarations also.

in declaration of linkedhashmap, implements map interface , not other interfaces implemented superclass hashmap.

so there might benefits of having such declarations.

there no functional benefits declaring them again, not affect behavior in way.

i guess it's added make clearer interfaces implemented.