Get keys from HashMap in Java

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One of most likely situation we seek is get keys of values from HashMap. While iterating through HashMap, there might be different scenarios as how mapping of key to value is done. 

We’ll discuss and see how we can get key/s of value/s of below mentioned pattern-

  1. Key to Value: Many to One (Many keys with same value)
  2. Key to Value: One to One (Every Key has unique value)

Lets see an example demonstrating both scenarios

Output:

Stay tuned for more updates!

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