Answer Posted / pinki

Main difference is methods of a Java interface are
implicitly abstract and cannot have implementations. A Java
abstract class can have instance methods that implements a
default behavior.
Variables declared in a Java interface is by default
final. An abstract class may contain non-final variables.
Members of a Java interface are public by default. A
Java abstract class can have the usual flavors of class
members like private, protected, etc..
Java interface should be implemented using keyword
“implements”; A Java abstract class should be extended using
keyword “extends”.
An interface can extend another Java interface only, an
abstract class can extend another Java class and implement
multiple Java interfaces.
A Java class can implement multiple interfaces but it
can extend only one abstract class.
Interface is absolutely abstract and cannot be
instantiated; A Java abstract class also cannot be
instantiated, but can be invoked if a main() exists.
In comparison with java abstract classes, java
interfaces are slow as it requires extra indirection.

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