Groups > comp.lang.java.programmer > #37001

Re: null checks

Newsgroups	comp.lang.java.programmer
Date	2017-07-26 11:40 -0700
References	<fb0314ea-bd97-4348-8af1-3ac9f9f46bdc@googlegroups.com> <ojoaip$pab$1@gioia.aioe.org> <70f5af57-8dc0-416c-b2aa-0bbbb47fc7b5@googlegroups.com> <ojoe2s$6rm$1@dont-email.me> <c7fe6140-5e85-4cbb-b1b1-cb72fbfbaec7@googlegroups.com>
Message-ID	<c660da66-8808-45b1-aa2a-8024e2bff635@googlegroups.com> (permalink)
Subject	Re: null checks
From	Eric Douglas <e.d.programmer@gmail.com>

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On Wednesday, July 26, 2017 at 2:17:07 PM UTC-4, lewb...@gmail.com wrote:
> `assert` is active documentation for algorithmic invariants. Its main purpose is to assert (hence the name) that an invariant holds. To use it correctly, one has to know what an invariant is and why it's important.
> 
> -- 
> Lew

I'm still not sure if or when assert is necessary.  I have it in one line of my API, and another class that was copy and pasted from that, and I don't recall if I came up with that or pasted that code from the web.

Would this be a valid use of assert?
http://www.programcreek.com/java-api-examples/index.php?source_dir=lsml-master/src/lisong_mechlab/view/ItemTransferHandler.java

This looks like where I may have copied from:
https://stackoverflow.com/a/4769575/6927352

Thread

null checks Eric Douglas <e.d.programmer@gmail.com> - 2017-07-07 08:03 -0700
  Re: null checks Arne Vajhøj <arne@vajhoej.dk> - 2017-07-07 11:49 -0400
    Re: null checks Eric Douglas <e.d.programmer@gmail.com> - 2017-07-07 08:54 -0700
      Re: null checks Arne Vajhøj <arne@vajhoej.dk> - 2017-07-07 12:12 -0400
        Re: null checks Eric Douglas <e.d.programmer@gmail.com> - 2017-07-07 10:16 -0700
        Re: null checks Joerg Meier <joergmmeier@arcor.de> - 2017-07-08 22:33 +0200
          Re: null checks Martin Gregorie <martin@address-in-sig.invalid> - 2017-07-08 21:14 +0000
            Re: null checks Eric Sosman <esosman@comcast-dot-net.invalid> - 2017-07-08 17:51 -0400
              Re: null checks Martin Gregorie <martin@address-in-sig.invalid> - 2017-07-08 22:26 +0000
            Re: null checks Arne Vajhøj <arne@vajhoej.dk> - 2017-07-08 18:28 -0400
            Re: null checks Joerg Meier <joergmmeier@arcor.de> - 2017-07-25 07:26 +0200
              Re: null checks Martin Gregorie <martin@address-in-sig.invalid> - 2017-07-25 12:12 +0000
          Re: null checks Arne Vajhøj <arne@vajhoej.dk> - 2017-07-08 18:20 -0400
            Re: null checks Eric Douglas <e.d.programmer@gmail.com> - 2017-07-10 05:35 -0700
        Re: null checks Robert Klemme <shortcutter@googlemail.com> - 2017-07-09 13:10 +0200
      Re: null checks Eric Sosman <esosman@comcast-dot-net.invalid> - 2017-07-07 12:53 -0400
        Re: null checks lewbloch@gmail.com - 2017-07-26 11:16 -0700
          Re: null checks Eric Douglas <e.d.programmer@gmail.com> - 2017-07-26 11:40 -0700
            Re: null checks Eric Sosman <esosman@comcast-dot-net.invalid> - 2017-07-26 16:40 -0400
            Re: null checks lewbloch@gmail.com - 2017-07-28 18:47 -0700
  Re: null checks Wayne <wayne@nospam.invalid> - 2017-07-07 16:24 -0400
  Re: null checks Joerg Meier <joergmmeier@arcor.de> - 2017-07-08 22:32 +0200
  Re: null checks Lothar Kimmeringer <news201705@kimmeringer.de> - 2017-07-09 15:59 +0200
    Re: null checks Arne Vajhøj <arne@vajhoej.dk> - 2017-07-11 20:30 -0400

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