Design Issue,Please reply

Hi,
If i want to define a HashMap,i can do it either as
a) HashMap map = new HashMap() or
b) Map map = new HashMap()
From design perspective which is better one and why ?
Thanks
vasubabu

When declaring references as superclasses or interfaces (such as List or Map or whatever), you can change the implementation without braking existing code. I.e. what was previously an ArrayList can be made a LinkedList and you only need to use 1 place in code. If you're not using a superclass reference, you need to change the code in more places.
It's not always necessary to declare the reference as a superclass one, but when the program might be changed later on and it's not absolutely certain that an ArrayList (for example) will be used, it's better to use List (or Map) as the reference.
Also Joey, your explanation sucked. There is no advantage in using a HashMap reference in place of a Map reference, apart from seeing the exact type in the places it's used.

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user444699 wrote:
Hi All
I added 2 extra columns to an existing table .
table tab (ATTD_IND,
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Design issue with the multiprovider :
I have the following problem when using my multiprovider.
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May be I was not clear enough in my first explanation, Let me try again to explain my scenario:
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Union
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1AAA     2BBB     3CCC
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http://help.sap.com/saphelp_bw30b/helpdata/EN/ad/6b023b6069d22ee10000000a11402f/frameset.htm
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Thank you very much in advance for your responses.
Best Regards.,
Praveen.

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