Collection that handles a key of String?

[JK4]

I have a collection:
A 10.10
B 12.12
C 32.32

I will use the first field (letter) to look up the second field (number).

Nothing fancy, only 90 entries, no need for sorting. Entries will be hard-coded. not even a need to edit.

I can't find an example of a collection, dictionary, array, hash, etc. that accommodates Strings data type for the key.

Any suggestions?

[Norm]

All collections that take objects for a key can take a String.
I don't know of any that do not.

If you are getting errors, please copy and paste the full text of the error message here.

[JK4]

Works perfect. Thank you very much. I found dozens of examples but every one used int for key.

Can I extend the question?
The objective is to convert the name of a piano key to its frequency. Collection Key is name of a piano key ("A4", "A#4" ... ) and Collection Value is the frequency (440.12, 452.34...). If data is 88 items, hard coded, added in alphabetical order by key, no additions or edits (read only) what is the best collection type?

Thanks.

[Norm]

what is the best collection type?

Define best.
How do you want to access the values?
A Map would be the simplest.