Java Programming - Inner Classes - Discussion

Here option A&C are same. Please explain the answer.

Agree, Option C is the right answer.

Difference between Normal/Regular class and Anonymous Inner class:

A normal class can implement any number of interfaces but anonymous inner class can implement only one interface at a time.

A regular class can extend a class and implement any number of interface simultaneously. But anonymous Inner class can extend a class or can implement an interface but not both at a time.

For regular/normal class, we can write any number of constructors but we can't write any constructor for anonymous Inner class because anonymous class does not have any name and while defining constructor class name and constructor name must be same.

I can't get the answer. Please clarify me.

I want just to correct one error on intervention of Ravi Shankar said: (Fri, Aug 12, 2011 12:54:23 AM).

Yes in child class you can implement any number of interface but in inner class only implement one interface or can extend one class (instead of one interface).

I don't understand, how come "It can extend exactly one class or implement exactly one interface" is right answer?

I think we CANNOT explicitly extend a class or implement interface when defining an ANONYMOUS INNER CLASS.

1 - A class which has no name is called anonymous class.

2 - We can use this class one time at object creation time because we do not store the reference id of this class.

3 - Anonymous class can be created by:

* Class (may be abstract class also).
* Interface

Like:

abstract class Fruit{
abstract void eat();
}

class Test{
public static void main(String args[]){
Fruit f=new Fruit(){
void eat(){System.out.println("nice fruits");}
};

p.eat();
}
}

What is anonymous class please explain in detail?

I don't understand exact meaning. Please explain in detail with example.

Yes in child class you can implement any number of interface but in inner class only implement one interface or can extend one interface.