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IN java collections we have both interfaces and classes.
instead of using interfaces why we can't use classes only
like that why we can't use interfaces only. why we need two
things interface and class.
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Answer Posted / easwar
Java doesn't support multiple inheritance.We achieve
multiple inheritance using interface concept.A class can
have only one super class and number of interface.And more
over interface has only abstract methods. We need a sub
class to implement it.We cannot create an object for an
interface. So we cannot use only the classes or only the
interfaces in java.
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