what is main difference b/w abstract class and interface

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what is main difference b/w abstract class and interface..

A class implementing an interface must implement all of the
methods defined in the interface, while a class extending
an abstract class need not implement any of the methods
defined in the abstract class. Additionally, a class
extending an abstract class can implement an infinite
number of it's own methods.

Abstract class does not support Multiple Inheritance .
Interface supports Multiple Inheriatnce..

The differnce is that in interface all are public but in
abstract class u can have private and protected members

Abstract class contains the method defination of the some
methods. but Interface contains only method declaration, no
defination

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what is main difference b/w abstract class and interface..

Answer / bindu madhavi

Abstract class is a class which has both complete
incomplete methods.

Interface is which can have only unimplemeted methods.

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what is main difference b/w abstract class and interface..

Answer / shikha sharma

1) Every method in interface class should be abstract, but
this is not necessary in abstract class.

2)abstract class is a class which must have at least one
abstract method.
interface is a class which having all abstract methods.By
default interface methods are public abstract.

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what is main difference b/w abstract class and interface..

Answer / priyabrata patro

listen in fact, java supports three types of structure. And they are fully implemented structure , fully unimplemented structure and partially implemented and unimplemented structure .
Now what is abstract class?
abstract class is one type of structure where exactly you can find both implemented and unimplemented method.I mean to say here it is partially implemented and unimplemented structure.So , usage of this class is to allow subclass to fullfill his own requirement by overriding abstract method defined in abstract class.And if you want to know complete information about abstract class you can contact to me in this email id priyabrata.try@gmail.com.

Now what is interface ?
interface is fully unimplemented structure where only unimplemented methods can be found out.And purpose to use this interface is to achieve run time polymorphism .
Now you will tell me that(run time polymorphism) also can be achieved by abstract class . Obviously , you can but you can not create object of interface but you can create object of abstract class by subclass (if it is a class).

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