Answer Posted / madhu samala

abstract is a keyword which can be applied to a class or a
class method. When we declare a class as an abstract one,
it may contain the abstract methods. Abstract method is a
method which contains only the declaration but not the
definition (body). The body for this method will be
provided in it's derived classes.
Note: An abstract class may not contain any abstract
method, but if it contains it must be declared as an
abstract class.
An interface is a contract. The contract will be between
the interface and the class.
An interface only contains abstract methods.i.e. They
contain only the method definition not the body.
The body for these methods must be provided inside the
class which implements that interface. If it doesn't
provide then it has to be declared as abstract.

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