Interested to Buy Any Domain ? << Click Here >> for more details...
Difference between Abstract Class & Interface?
- 4 Answers
- 7123 Views
- HCL, IBM, I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / rakesh.fanu
Abstract Class :-
Abstract class should be declare with abstract.
Abstract Class must be extended by its sub class.
Abstract Class has abstract method and also method with
body also.
Abstract Class has not instance variables , it contain only
Constant.
An abstract class cannot be instantiated
Interface :-
Interface must be Implemented by another class.
Interface has only abstract method.
Interface has not instance variables , it contain only Constant.
An Interface cannot be instantiated
| Is This Answer Correct ? | 6 Yes | 2 No |
Answer / brijendra kumar(xavient)
Abstract Class:
1-Abstact class declare with the abstract keyword.
2-Abstract class contains the both method declaration and
defeination.
3-Abstract class donot have the instant variable.It have
only constrants.
3-Abstract class extended by its sub class.
4-Abstract class support only single inheritence.
Interface:
1-Interface declare with the interface keyword.
2-Interface contains the only collection of method
signature.
3-Interface implement by a class.
4-Interface extended by one or more interfcae.
5-Interface support the multiple inheritence.
6-Interface is useful for java development.
| Is This Answer Correct ? | 1 Yes | 0 No |
Answer / nivas
abstract class is declared in abstract and instance methods
but were as interface class is declared only in abstract method
| Is This Answer Correct ? | 0 Yes | 0 No |
Answer / adikeanand@gmail.com
ABSTRACT CLASS:
1)abstract class contains abstract methods with body and concrete methods also.
2) when a class contains abstract methods declare the class as abstract.
3) when we don't want to allow anybody to create object to the class then declare class as abstract.when we want to use the methods of a abstract class write a class which extends abstract class and create reference variable to abstract class and assign subclass object.
4)We can not create object to the abstract class but we can create reference variable.
INTERFACE:
1)Interface contains abstract methods and static final data.
2)when we are writing a class which implementing interface then we have to provide the body for all the abstract methods of interface.
3)If we don't want to provide all the methods of interface then declare the class as abstract.write the class which extends abstract class and write the methods which you have left abstract methods and create reference variable to interface and assign the object of class which extends abstract class.
| Is This Answer Correct ? | 0 Yes | 0 No |
Is jprofiler open source?
What is java api?
What is difference between loosely coupled and tightly coupled in java?
What is stateful in java?
what is the package for freshers in valuelabs.
What is a jvm?
What is the java api?
For each of the following program segments,give a big zero analysis for the running time 1.For (i=0;i<m;i++) { // } 2.For (j=0;j<i;j++)
0 Answers St. Pauls University,
What about products that claim to block java applets at a firewall? : java security
Explain the common use of ejb?
Which is the best book for whole java study?
How do I open the java console in windows 10?
Java J2EE 
