Answer Posted / leeladhar

abstract means hiding some thing and interface are use for
multiple inheritence because a subclass can't extend by two
base class it can implement by two interface only.

in abstract class some method will be abstract or some
method will be non abstract.
for abstract method you need subclass that will be define
base class's abstract method.
subclass is not mendatory to all abstact class.

in interface all method will be abstract type so for that
subclass is mendatory that will define method.

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