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Re: question about casting and inheritance

From markspace <markspace@nospam.nospam>
Newsgroups comp.lang.java.programmer
Subject Re: question about casting and inheritance
Date 2014-01-09 13:00 -0800
Organization A noiseless patient Spider
Message-ID <lan2l6$657$1@dont-email.me> (permalink)
References <5dfabbeb-9201-488d-b56b-e1cef3913c92@googlegroups.com>

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On 1/9/2014 10:48 AM, marc.at.compass@gmail.com wrote:
> 		a=b;
> 		b=(B)a;

> Why is it the line b=(B)a; doesn't give me a ClassCastException during runtime?

Because the line above assigns 'b' to 'a'.  It's actually the only 
interesting thing inside the program.  The second line with the cast is 
a tautology: it casts 'b' to a 'B'.

A more explicit naming scheme for your variables would help a lot to 
understand this.

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Thread

question about casting and inheritance marc.at.compass@gmail.com - 2014-01-09 10:48 -0800
  Re: question about casting and inheritance leif.roar@invalid.com (Leif Roar Moldskred) - 2014-01-09 13:03 -0600
  Re: question about casting and inheritance Eric Sosman <esosman@comcast-dot-net.invalid> - 2014-01-09 14:07 -0500
  Re: question about casting and inheritance markspace <markspace@nospam.nospam> - 2014-01-09 13:00 -0800
  Re: question about casting and inheritance Ricardo Palomaes <rpmdisguise-java@nowhere.com> - 2014-01-09 23:24 +0100
    Re: question about casting and inheritance Ricardo Palomares <rpmdisguise-java@nowhere.com> - 2014-01-12 12:20 +0100
  Re: question about casting and inheritance Patricia Shanahan <pats@acm.org> - 2014-01-10 03:04 -0800
    Re: question about casting and inheritance Arved Sandstrom <asandstrom2@eastlink.ca> - 2014-01-11 09:38 -0400
  Re: question about casting and inheritance Roedy Green <see_website@mindprod.com.invalid> - 2014-01-10 16:36 -0800
  Re: question about casting and inheritance marc.at.compass@gmail.com - 2014-01-11 08:01 -0800

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