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Editorial Team
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Asked: 2026-05-30T07:15:09+00:00

I have a doubt on the design methodology that why we implement the code

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I have a doubt on the design methodology that why we implement the code to the interface. This is very much observed in primitive data types. Like I am not getting the difference between these two :

Map<Integer, String> mymap = new HashMap<Integer, String>();

And

HashMap<Integer, String> mymap = new HashMap<Integer, String>();

Is there any difference between these two? I mean each and every place where we are going to use mymap will remain same in both the cases.

I am sorry if the question seems to be of no use but I really not getting that how this is going to make any difference later on where mymap will be used. Please help?

Thanks..

Note – I have already seen this question on SO but it is not giving what I want.

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1 Answer

  1. Editorial Team

    Because mymap can be instantiated somewhere else with a different implementation of Map, you should not rely on it being an instance of HashMap in the code using it.

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