Difference between abstract class and interface
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Answer Posted / maneswari
Interfaces provide a form of multiple inheritance. A class
can extend only one other class.
Interfaces are limited to public methods and constants with
no implementation. Abstract classes can have a partial
implementation, protected parts, static methods, etc.
A Class may implement several interfaces. But in case of
abstract class, a class may extend only one abstract class.
Interfaces are slow as it requires extra indirection to to
find corresponding method in in the actual class. Abstract
classes are fast.
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