Answer / shreeram sahu

1.abstract class contain abstract and non abstract methods
but interface contain only abstract methods.
2.abstract method can be declared in public or protected
section. but all components of interface by default are
public.
3.a class can inherit only one abstract class but a class
can implement any no of interfaces.
4.abstract class components are directly reffered in
subclass.butinterface components must be prefixed with the
name of the interface.

Answer / nandhini

ABSTRACT CLASS IS HAVING EXTENDS, IT IS USING IN PRIVATE & PROTECTED.

INTERFACE CLASS IS HAVING IMPLEMENTED, JAVA CLASS IMPLEMENT MULTI INTERFACE,IT IS USING PUBLIC.

Answer / deepak baroliya

1.java abstract class is faster than the interface.
2.all interfaces inherits the non final method of the object class.
3.interface are designed to support dynamic method resolution.

Answer / ved

An abstract class may contain complete or incomplete method.
Interface can contain only the signature of a method but no
body. Thus an abstract class can implement methods but an
interface can not implement method.

Answer / siva choudary

abstract class does not multiple inheritane

interface supports declarative multiple inheritance

Answer / tevendra singh pardhi(balaghat

Abstract Class:
(1)it contains both abstract methods and non abstract
methods
(2) object can't be created just through reference we are
calling all the methods
(3) it is implemented by subclass i.e which class is
extended from this
abstract class contains only nonabstract this situation
also code will compile fine but problem at runtime
abstract can't be declared with Final Synchronized Native
just your requirements you implement some methods in the
abstract class
this class also contain Constructor


Interface contains all abstract methods
all methods compulsory implemented by particular class
interface does not contain Constructor

Answer / jenish gandhi

All the methods declared inside an Interface are abstract.
Where as abstract class must have at least one abstract
method and others may be concrete or abstract. In Interface
we need not use the keyword abstract for the methods.

Answer / ravi kant

abstraction mechanism provides a way to manage the system components and there corresponding interaction without considering the details of building those components and, interface is possible in some of the languages where multiple inheritance can't be used.or
interface is a collection of method declaration and constants that one or more classes of objects will use.Interface definition is same as class except that it consists of the method that are declared have have the parameter list.

Answer / gurvinder kaur

1.In interfaces,keyword abstract is necessary.
2.in interfaces all functions should be abstract but in
abstract at least 1 function should be abstract.
3.in interfaces there is no inheritance but it can be in
abstract classes

Answer / vikas kaundal

1.we never pass object in abstract class only inherit the
abstract class and in which pass the references only

interface
1.in which declare only member.
2.we can implement the multiple interface.
3. its used only standlizition.
4.we can inherit the interface

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