Answer Posted / kala

1) if the class is abstract. this class con't instatiate any
object. if we that class implemented with interface, we can
instatiate object with respect interface methods.

2) if we extend that particular abstract class, we must be
implemented all those abstract methods in that class.
otherwise it will automatically become abstract class. in
interface, if we implements the interface not compalsory
implemented, we can use those class ref.

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