Because interfaces do not the
implementation details, they only know
what operations an object can do.
Multiple inheritance is difficult when
there are two different
implementations are found for the
method with same signature in both the
base classes. But in case of interface
both the interface may define a common
method with same signature but they
are not implemented at the interface
level, they are only implemented by
the object or type that implement both
the interfaces. Here though there are
two different interfaces defining two
methods with same signatures, the
object provides the common
implementation satisfying both the
methods in both the interfaces. So
there is no ambiguity between
implementations, both the methods have
common implementation hence you could
have multiple inheritance in case of
interfaces.
