What is the difference between Map and HashMap in java

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Can you please explain the difference between map and hashmap?

How they are different from each other?
May 31, 2019 in Java by sanhati
25,350 views

2 answers to this question.

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Hi Sanhati,

I understand your doubt regarding map and hash map.

Please check out my answer, I hope it will clear your doubts.

Hash map: 

  • It is the implementation of map interface.
  • It can contain null values and keys.
  • It doesn't maintain input order.

Map: 

  • It is an interface
  • Map has two implementation
  1. Tree Map
  2. Hash Map
  • Tree Map maintains the input order .
  • It will not allow any null values.
  • Duplicate keys are not allowed in the map
answered May 31, 2019 by sampriti
• 1,120 points
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The basic difference is : Map is an interface, i.e. an abstract "thing" that defines how something can be used. HashMap is an implementation of that interface.

If you need to know more about Java, then join our Java training class now.

answered Aug 28, 2019 by Sirajul
• 59,190 points

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