Interested to Buy Any Domain ? << Click Here >> for more details...
What is the difference between abstract class and interface?
- 3 Answers
- 6670 Views
- Aspire, I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / ranganathkini
An interface is purely contractual in that it only defines
method headers but no implementation. Classes that implement
the interface must provide implementation to all method
defined by the interface.
An abstract class contains partial implementation, i.e. it
provides implementation for some methods where as just
defines abstract method headers for other. Abstract classes
cannot be instantiated directly and have to be extended by
subclasses who implement the abstract methods defined in the
abstract superclass. Unlike an interface, subclasses of the
abstract class only need to implement only those methods
that are marked abstract.
| Is This Answer Correct ? | 6 Yes | 0 No |
Answer / venu
A programer uses an abstract class when there are some
common features of the program shared by all the objects.
A programer uses an interface when all the features of the
program are implements differently for different objects.
| Is This Answer Correct ? | 3 Yes | 1 No |
Answer / srikanth reddy
1. Abstract classes may have some executable methods and
methods left unimplemented. Interfaces contain no
implementation code.
2. An class can implement any number of interfaces, but
subclass at most one abstract class.
3. An abstract class can have nonabstract methods. All
methods of an interface are
abstract.
4. An abstract class can have instance variables. An
interface cannot.
5. An abstract class can define constructor. An interface
cannot.
6. An abstract class can have any visibility: public,
protected, private or none
(package). An interface's visibility must be public or none
(package).
7. An abstract class inherits from Object and includes
methods such as clone() and
equals().
| Is This Answer Correct ? | 1 Yes | 0 No |
Are strings immutable in java?
How do you define a parameter?
Can a set contain duplicates?
What is a singleton class in Java?
What are inner classes or non static nested classes in java?
What methodology can be utilized to link to a database?
What will be the initial value of an object reference which is defined as an instance variable?
To set the position and size of a component, which methods are used?
What is the output of the following Java program? class Main { public static void main(String args[]){ final int i; i = 10; System.out.println(i); } } 10. What is the output of the following Java program? class Main { public static void main(String args[]){ final int i; i = 10; System.out.println(i); } }
real time example for deadlock,starvation,livelock
What is the difference between dom and sax parser in java?
Can we rethrow the same exception from catch handler?
Core Java 
