what is difference between Interface and abstract class
- 2 Answers
- 4810 Views
- GCPL, I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / naveen
Interface is a specification it tells a class has what to do.
It is purely abstract class it contains abstract methods and final static variables.
Generally begining of the project PM or TL are providing the Interfaces, developers are implementing the Interfaces.
Abstract class
Abstract class is a mediator between Interface and Class , any common code is their that code written in Abstract class and then extend the Abstract class. Abstract class containing abstract and concreate methods.
Abstract class are used in Designing level.If take java predifined class we understand easily.
| Is This Answer Correct ? | 8 Yes | 0 No |
Answer / surender kannuri
interface is a specification of method prototype.
all methods in interface are abstract and final.
interface methods are public since they should be available
to third party vendor to provide implementation.they are
abstract because their implementation is left for third
party vendors.
interface contains 0 or more abstract methods.
all methods of interface should implemented in implemented
class.if any method is not implemented then implementation
class should be declared as abstract.
we can't create object to interface.but we can create
reference to interface type.
an interface contains variables ,such as public.static and
final variables.this means all variables of interface are
constant.
an interface cannot implements another interface.
an interface can extend another interface.
it is possible to write a class within an interface.
a class can implements(not extend) multiple interfaces.
abstract class contains 0 or more abstract methods.
all methods of abstract class should be implemented in
subclasses only.
all methods of abstract class should be declared by using
abstract keyword.
we can't create an object to abstract class.
| Is This Answer Correct ? | 1 Yes | 1 No |
Can a constructor call the constructor of parent class?
What access modifiers can be used for variables?
What are the properties of thread?
write SQL command for table employee where print first name or last name start like "A" and who is working in domain(angular js,java,dotnet)
What is a file pointer?
What is parameters example?
Can we create a constructor in abstract class?
how to know the total memory occupied by the objects in the ArrayList(Array list may contain duplicate objects)
A non-static inner class may have object instances that are associated with instances of the class’s outer class. A static inner class does not have any object instances.
What comes to mind when someone mentions a shallow copy in java?
What is a class ?
What is the arraylist in java?
Core Java 
