Answer Posted / karthick

Unlike interfaces, abstract classes can contain fields that
are not static and final, and they can contain implemented
methods. Such abstract classes are similar to interfaces,
except that they provide a partial implementation, leaving
it to subclasses to complete the implementation. If an
abstract class contains only abstract method declarations,
it should be declared as an interface instead.

Multiple interfaces can be implemented by classes anywhere
in the class hierarchy, whether or not they are related to
one another in any way. Think of Comparable or Cloneable,
for example.

By comparison, abstract classes are most commonly subclassed
to share pieces of implementation. A single abstract class
is subclassed by similar classes that have a lot in common
(the implemented parts of the abstract class), but also have
some differences (the abstract methods).

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