For example , why should I use
Map<String, List<String>> phoneNumbers = new HashMap<String, List<String>>();
instead of
HashMap<String, List<String>> phoneNumbers = new HashMap<String, List<String>>();
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Aleksey Galanov
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if phoneNumbers variable's scope is not greater than one method then I would say that usually there's no difference. If this is a field and you decide should your accessor use an interface or a concrete implementation then it really matters. – S. Pauk Mar 26 '15 at 19:14
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I agree with Sergey .. interfaces allow clean separation at *boundaries*, but are not necessarily applicable at a local (or private/protected) level. – user2864740 Mar 26 '15 at 19:17