Re: Socket.getInputStream() question

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#271

From: Shankar Unni
Date: Wed, 24 Mar 2004 21:41

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Ron wrote:

> InputStream in = sock.getInputStream();
> in.read(....);
> 
> what I don't understand (as a novice) is: InputStream is abstract so it
> cannot be instantiated. But an InputStream object is being instantiated,
> right? So, how?

No, it's not being *directly* instantiated. What's being instantiated is 
a concrete subclass of InputStream (namely a SocketInputStream).

The reason the API is defined in this fashion (as returning the abstract 
base class) is to give the implementor some flexibility in returning a 
different type of InputStream in a different version, without forcing 
all the callers to recompile.

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