Class hierarchy of AbstractMap is as follows "AbstractMap implements Map" Class hierarchy of HashM - This is because AbstractMap is the abstract class and not all methods from Map interface are implemented in AbstractMap. Hence HashMap implements Map interface to implementÂ of the metods in Map interface.

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Question: Class hierarchy of AbstractMap is as follows
"AbstractMap implements Map"
Class hierarchy of HashMap is as follows
"HashMap extends AbstractMap implements Map"
When AbstractMap implements Map interface and AbstractMap is extended by HashMap, what is the use of again implementing Map interface in the declaration of HashMap?.

Answer: This is because AbstractMap is the abstract class and not all methods from Map interface are implemented in AbstractMap. Hence HashMap implements Map interface to implementÂ of the metods in Map interface.

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Question: Class hierarchy of AbstractMap is as follows
"AbstractMap implements Map"
Class hierarchy of HashMap is as follows
"HashMap extends AbstractMap implements Map"
When AbstractMap implements Map interface and AbstractMap is extended by HashMap, what is the use of again implementing Map interface in the declaration of HashMap?.

Answer:

This is because AbstractMap is the abstract class and not all methods from Map interface are implemented in AbstractMap. Hence HashMap implements Map interface to implementÂ of the metods in Map interface.
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