Difference between abstract class and interface
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Answer / vamsikrishna
An abstract class can contain all the abstract methods are
all the concrete methods are both.
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Answer / geetika.......:)
1)all methods in interface need to be defined in class that implemented it.but abstract class may define all some or none of the methods declared in it.
2)abstract class cant instantiate object but class with interface can
3)interface do not have constructors abstract classes have
4)class may implement number of interfaces but can extend only one abstract class
5)variables must be initialized in interface but its not necessary in abstract class.
6)interface has abstract functions but abstract class has abstract as well as concrete functions.
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Answer / sunil
abstract class dose not supports multiple inheritance while
interface supports multiple inheritance
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Answer / pavan kumar.m
Anterface :
In interface all d methods are abstrct,we use interface for
defining constants interface is cant directly inherited
with any class .Interface is defined
independently,interface have inherited related
relationship with inheritance only.
Abstract class:
In abstract class some methods are abstract methods and
these classes are used to prevent the creation of
object,these classes are used to define fields.
Abstract methods having abstract modifiers
| Is This Answer Correct ? | 1 Yes | 0 No |
Answer / venkataramana
A method with method body is called "Concrete method or
Complete method".
A method without method body is called as "Abstract Method".
Abstract Class :
----------------
1.An abstract class is a class which contains 0 or more
abstract methods.
2.An abstract class can have ,
* Instance Variables
* Complete Methods
* Abstract Methods
3.When an abstract class is written, it is the duty of the
programmer to provide sub classes to it.
4.We cannot create an object to abstract class.
5.But we can create a reference to the abstract class.
6.we cannot declare a class as both abstract and final.
Interfaces:
-----------
1.An interface is a specification of method prototypes.
2.An interface contains only "Abstract Methods".
3.An interface contains Constants
4.All the methods of an interface can be "abstract and
final" by default.
5.We cannot create an object to abstract class.
6.But we can create a reference to the abstract class.
7.An interface is written , when the programmer wants to
leave the implementation to the thid party vendors.
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Answer / venkatesh
1)Both Abract class and Interface not instantiable but
refernce can be created.
| Is This Answer Correct ? | 1 Yes | 0 No |
Answer / sachin pawar
1) Abstract class is must inheritable & its scope is upto
derived class
2) Interface is must implementable & its scope is upto any
level of its inheritence chain.
| Is This Answer Correct ? | 1 Yes | 0 No |
Answer / owzy
We can't instantiate an Abstract Class.Objects can't be
formed from Abstract class.
Abstract classes are meant to be inherited only
| Is This Answer Correct ? | 1 Yes | 0 No |
Answer / sudhakar
An Abstract class contains both abstract and non abstract methods.but the interface contains only abstract methods.
Abstract methods declared with the keyword Abstract where interface declared with interface keyword.
By using interface concept multiple inheritance is support.
| Is This Answer Correct ? | 1 Yes | 0 No |
Answer / aktharul ameen
1.Abstract class is act as a base class which define some
rule to its sub class or derived class where as interface
gives its methods and properties to be implemented by
derived class
2.Abstract class can be private,public etc...where as
interface are intended for public only.
| Is This Answer Correct ? | 1 Yes | 0 No |
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