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abstract class and overriding
1 Answer(s)      5 years and 10 months ago
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September 29, 2008 at 3:36 PM


Hi friend,

Abstract class :

In java programming language, abstract classes are those that works only as the parent class or the base class. Subclasses are derived to implement the methods inherited from the abstract class (base class). Abstract classes are not instantiated directly. First extend the base class and then instantiate (create objects). Abstract classes are generic in nature and implement to those methods that are used commonly by the subclasses with common implementation. Abstract classes .

e.g

abstract class A{
public abstract void abs_value();

}

public class B extends A{

public void abs_value()
{
System.out.println("Hello World");
}

public static void main(String args[])
{
B b = new B();
b.abs_value();
}

}

interface :

An interface is a group of related methods with empty bodies.

e.g

interface class A{
void abs_value();

}

public class C implements A{

public void abs_value()
{
System.out.println("Hello World");
}

public static void main(String args[])
{
B b = new B();
b.abs_value();
}

}

Difference between abstract class and interface :

Abstract class

*)Abstract class is a class which contain one or more abstract methods, which has to be implemented by sub classes.
*)Abstract class is a Class prefix wtih a abstract keyword followed by Class definaton.
*)Abstract class contatins one or more abstract methods.
*)Abstract class contains the method defination of the some methods.
*)Abstract classes are useful in a situation that Some general methods should be implemented and
specialization behaviour should be implemented by child classes.

interface

*)Inteface is a Java Object containing method declaration and doesn't contain implementation.
*)The classes which have implementing the Interfaces must provide the method defination for all the methods.
*)Interacace is a Interface which starts with interface keyword.
*)Interface contains all abstract methods and final declarations.
*)Interface contains only method declaration, no defination provided
*)Interafaces are useful in a situation that all properties should be implemented we can use this scenario.

overriding :

In overriding method have same method,signature and parameters.

In the above example in abstract class A abs_value() method override in class B having same signatures and parameters.


For read more information :
http://www.roseindia.net/

Thanks



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