Why ConcurrentHashMap.Segment and ConcurrentHashMap.HashEntry classes are static?

Question

Why ConcurrentHashMap.Segment and ConcurrentHashMap.HashEntry classes are static? Why it is designed in this way ?

Answer 1

Basically all inner classes which does not need to use the properties of their enclosing classes are supposed to be static. This comes from the general principle in java which says that every object should have access to the least possible other objects.