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That makes it look like you are trying to create a hash map.
The HashMap class takes care of doing the hashing. The user provides a key|value pair with the put and can get access to the value by...

"drew" is not a valid String of numeric digits for the parse method. "12324" is a valid String

What are the key values you want to use to access the HashMap to retrieve the Node as the value.

Start by reading the API doc for the class. If you have any questions about what it says there, copy the text that is the problem and paste it here with your questions.

Are you trying to write your own version of a HashMap class
or use the version in Java SE?