How to return a hashmap key using the value?

Hi

How do you return a key that relates to a value?

I have a hashmap - Map <String,ArrayList<Integer>>

which I wish to write a method for that scans through the ArrayList<Integer> and returns the key of a given is within the ArrayList

thanks

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Originally Posted by trying

Hi

How do you return a key that relates to a value?

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You don't. There is no guaranteed one-to-one correspondence between value and key (as opposed to the other way around).

Quote:

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I have a hashmap - Map <String,ArrayList<Integer>>
which I wish to write a method for that scans through the ArrayList<Integer> and returns the key of a given is within the ArrayList

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This post is not clear to me at all. What exactly are you trying to do again? What code do you have?