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OOP-4 Lookup hashmap

 
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I once done this assignment a while back and now trying to enhance it and stuff. But I found a potential problem with my implementation.

When the hashmap is created should the value be a "Thing" or "String" through the getDescription() method?
eg HashMap<Integer, String> hMap ... or HashMap<Integer,Thing> hMap ...
assuming I populate the hashmap like this:
hMap.put(1, new BookOnTape()); //<Integer,Thing>
hMap.put(1, new BookOnTape().getDescription()); //<Integer,String>

Another way of asking is once the hashmap is populated, should the Thing's serial number be the same as the hashmap key?

Thanks
 
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The value should be a Thing.

It is ok if the Thing's serial number is the same as the hashmap key, but the value should be the Thing, not the Thing's description.
 
K. Tsang
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Thanks Marilyn, I got the serial number same as hashmap key
 
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