no,since we cannot instantiate objects for an Abstract class
memory is not allocated for an abstract class

For abstract classes we can't create an object  directly
with the help of the new operator.So memory is not allocated
for abs classes.

but according to my understanding ,objects of abstract
variables are create but memory can't be allocated as.the
memory of this points to null..we can say tht.objects of
abstract class can't be created.. am i right?

for abstract class in java can not be directly instantiated 
with new operator Because abstract class is not fully 
defined.ie,it's meaningless to implement incomplete class 
and Since "classname var =new classname();" is responsible 
for allocating the memory ,hence there will be no memory or 
object will be instantiated for abstract class.
But we can make reference to abstract class.
example Box b1;