About Question enthuware.ocpjp.v8.2.1101

[binget]

Which of the following methods are available in java.util.concurrent.ConcurrentMap in addition to the methods provided by java.util.Map?

You answered: boolean remove(Object key, Object value),
V putIfAbsent(K key, V value),
boolean replace(K key, V oldValue, V newValue)

But since java 1.8, all of them are also found in Map interface as a default methods. Please give an explanation on this?

Thank you.

[admin]

You are right. This question has now been fixed to including this point.

thank you for your feedback!
Paul.