HashMap in java

In the Previous post, we have learnt about TreeSet in java. In this post, we will learn HashMap in java.

HashMap has the following features.

  • HashMap implements Map Interface and extends AbstratMap class.
  • It stores the data in the form of Key and value pair.
  • It contains only unique elements.
  • It may have one null key and multiple null values.
  • It does not maintain an order.

What is difference between HashSet and HashMap?

HashSet contains only values whereas HashMap stores data in form of key and value.

Let’s understand HashMap in details.


Add elements to HashMap
Shekhar Sharma

Shekhar Sharma

Shekhar Sharma is founder of testingpool.com. He is an automation engineer having more than 8 years of experience who loves troubleshooting in automation and finding innovative ways to solve the problems. His other leisurely activities includes playing harmonica, paintings, sketching portrait, watching movies and travelling etc.

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1 Response

  1. September 22, 2015

    […] this post, we have seen about HashMap. In this post, we will learn how to add elements to […]

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