abstract class

[Rahul Ramachandran]

Here's a simple one from Mughal.
Which of these two is a legal definition of a class that cannot be instantiated?
//1
abstract class Ghost
{
void haunt();
}
OR
//2
abstract class Ghost
{
void haunt(){};
}

The answer given is 2.
Why?
Thanks
Rahul

[Paul Anilprem]

void haunt(); : If you do not provide a body then you must declare it abstract.
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[nitin sharma]

In your second case u have decalred an abstract class comtaining a non abstract method.That is perfectly fine.

[sona gold]

but the question here is which is the right declaration for a class that cannot be instantiated.
both the above shown classes are abstract and hence cannot be instantiated.

[rajashree ghatak]

no the first one is illegal declaration of an abstract class.The reason being "If you do not provide a body to a method then you must declare it abstract". Notice void haunt(); which doesnot have abstract keyword in its declaration.
Therefore only 2nd class declaration is valid.
rajashree.

[sona gold]

thanks rajashree
u got a point here
i missed it
yes so the 2nd option is the right answer