Answer Posted / thakur laxmikant

1. Abstract class can have implemented methds
but interface contains only final varibles and
method declaration(signature);

2. In Abstract class there is "IS A " Kind of relationship
between abstract class and its implemented method class
but in interface it can be between any non-relative
classes.

3. Absrtact class can be extended by only one class;
Interface can be implemented by more than one class;
ie. class can inherit only one abstract class
but class can implement more than one interface.

4.A class implementing an interface has to
implement all the methods of the interface,
but the same is
not required in the case of an abstract Class.

5.Access modifiers (protected, abstract, public, etc. )are
useful in abstract Classes but not in interfaces.

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