Difference between HashMap and Map in Java

Question

Possible Duplicate    Java - HashMap vs Map objects       I want to know the difference between HashMap and Map in java

User · Answer

Map is an interface in Java  And HashMap is an implementation of that interface  i e  provides all of the methods specified in the interface

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Map lt K V gt  is an interface  HashMap lt K V gt  is a class that implements Map  you can do Map lt Key Value gt  map   new HashMap lt Key Value gt      Here you have a link to the documentation of each one  Map  HashMap

User · Answer

Map is an interface  i e  an abstract  thing  that defines how something can be used  HashMap is an implementation of that interface

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Map is an interface  HashMap is a particular implementation of that interface   HashMap uses a collection of hashed key values to do its lookup   TreeMap will use a red-black tree as its underlying data store

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HashMap is an implementation of Map  Map is just an interface for any type of map

[java] Difference between HashMap and Map in Java..?

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