what is the difference between abstract class and
Interface?where we can use it in realtime projects?
Answer Posted / varun kumar
1.interface contains methods that must be abstract;
abstract class may contain concrete methods.
2.interface contains variables that must be static and
final; abstract class may contain non-final and final
variables.
3.members in an interface are public by default, abstract
class may contain non-public members.
4.interface is used to "implements"; whereas abstract class
is used to "extends".
5.interface can be used to achieve multiple inheritance;
abstract class can be used as a single inheritance.
6.interface can "extends" another interface, abstract class
can "extends" another class and "implements" multiple
interfaces.
7.interface is absolutely abstract; abstract class can be
invoked if a main() exists.
8.interface is more flexible than abstract class because
one class can only "extends" one super class,
but "implements" multiple interfaces.
9.If given a choice, use interface instead of abstract
class.
Is This Answer Correct ? | 3 Yes | 1 No |
Post New Answer View All Answers
How we can execute any code even before main method?
Does java allow overriding static methods ?
What is the best way to findout the time/memory consuming process?
Break statement can be used as labels in java?
Explain the different forms of polymorphism?
Why is inheritance used in java?
What is the difference between menuitem and checkboxmenu item?
What lambda means?
Which is faster call by value or call by reference?
What is a treeset class?
Is a boolean 1 bit?
Where can I find jdk in my computer?
How many types of equations are there?
How do you reverse a string in java?
What is string [] java?