I came across this question in interview; We can not instantiate abstract class and interface then why can not we declare variable in interface though we can declare it in abstract class?
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An interface is a contract without implementation details like fields. An abstract class can be used interface-like, but can contain implementation details for derived classes (reusability). – KBO Jan 30 '19 at 07:01
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_Fields_ are supposed to be internal to a class object. Where they need to be exposed, they should be done through _properties_. An interface allows you to define properties. – DiplomacyNotWar Jan 30 '19 at 07:01