Difference between Map h = new HashMap() and HashMap h1 = new HashMap()

Hi,
I am new to Java.I am just confuse that what are the benifits or difference between these two approaches.
1. Map map = new HashMap();
2. HashMap hashMap = new HashMap();
Please reply as soon as possible.
Thanks
Sachin

Well the difference is that one declares the variable "map" as type "Map"
The second declares the variable as type "HashMap"
Why would you want to do this?
Lets say at some point in the future, you decide you want the Map sorted. ie use a TreeMap instead of a HashMap.
If you have used "HashMap" everywhere in your code, then you need to change all occurences of it to TreeMap.
However if you just used "Map", the only dependency on "HashMap" is in this one line of code.
Which do you think would be easier to change?

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