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need of abstract class

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Join Date: May 2007

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tinamary

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need of abstract class

Sep 26th, 2007

i know the concept of abstract class in java and this concept is used in interface, i.e all the methods declared in interface are abstract. i want to know how the abtract class is different from the normal class in java

Thanks a million

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Join Date: Feb 2006

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masijade

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Re: need of abstract class

Sep 26th, 2007

I'm sorry, but if you "know the concept of abstract class", then you know how it "is different from the normal class".

Maybe we should begin with you stating what you believe to be "the concept of abstract class", and what you believe to be "the normal class". Then we can continue on.

The most basic difference, of course, is that you cannot instantiate the abstract class, directly. That does not mean that you cannot get an instatiated object declared as an abstract type, but you cannot directly instantiate the abstract class (except anonymously, in which case it is still not really a direct instantiation of the abstract class as it will be "extended" inline, i.e. the methods are defined on instantiation).

Java Programmer and Sun Systems Administrator

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Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it.
--Brian Kernighan