How HashMap works in java? or How does get () method of HashMap works in Java?

• HashMap works on principle of hashing. 

• When we pass Key and Value object  to put() method on Java HashMap, HashMap implementation calls hashCode method on Key object and applies returned hashcode into its own hashing function to find a bucket location for storing Entry object. 

• Important point to mention is that HashMap in Java stores both key and value object as Map Entry in bucket which is essential to understand the retrieving logic.  

• If people fails to recognize this and say it only stores Value in the bucket they will fail to explain the retrieving logic of any object stored in Java HashMap.