http://wiki.karljones.com/index.php?action=history&feed=atom&title=Class_variable 2026-10-23T14:49:17Z Revision history for this page on the wiki MediaWiki 1.24.2 http://wiki.karljones.com/index.php?title=Class_variable&diff=17170&oldid=prev 2016-08-24T20:34:46Z

<p></p> <table class='diff diff-contentalign-left'> <col class='diff-marker' /> <col class='diff-content' /> <col class='diff-marker' /> <col class='diff-content' /> <tr style='vertical-align: top;'> <td colspan='2' style="background-color: white; color:black; text-align: center;">← Older revision</td> <td colspan='2' style="background-color: white; color:black; text-align: center;">Revision as of 20:34, 24 August 2016</td> </tr><tr><td colspan="2" class="diff-lineno">Line 1:</td> <td colspan="2" class="diff-lineno">Line 1:</td></tr> <tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>In [[object-oriented programming]] with classes, a '''class variable''' is a [[Variable (<del class="diffchange diffchange-inline">programming</del>)|variable]] defined in a [[Class (computer programming)|class]] of which a single copy exists, regardless of how many [[Instance (computer science)|instances]] of the class exist.</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>In [[object-oriented programming]] with classes, a '''class variable''' is a [[Variable (<ins class="diffchange diffchange-inline">computer science</ins>)|variable]] defined in a [[Class (computer programming)|class]] of which a single copy exists, regardless of how many [[Instance (computer science)|instances]] of the class exist.</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>A class variable is not an instance variable. It is a special type of class attribute (or class property, field, or data member). The same dichotomy between instance and class members applies to methods (&quot;member functions&quot;) as well; a class may have both instance methods and class methods.</div></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>A class variable is not an instance variable. It is a special type of class attribute (or class property, field, or data member). The same dichotomy between instance and class members applies to methods (&quot;member functions&quot;) as well; a class may have both instance methods and class methods.</div></td></tr> <tr><td colspan="2" class="diff-lineno">Line 8:</td> <td colspan="2" class="diff-lineno">Line 8:</td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* [[Instance (computer science)]]</div></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* [[Instance (computer science)]]</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* [[Object-oriented programming]]</div></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* [[Object-oriented programming]]</div></td></tr> <tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>* [[Variable (<del class="diffchange diffchange-inline">programming</del>)]]</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>* [[Variable (<ins class="diffchange diffchange-inline">computer science</ins>)]]</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>== External links ==</div></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>== External links ==</div></td></tr> </table>

Karl Jones http://wiki.karljones.com/index.php?title=Class_variable&diff=17169&oldid=prev 2016-08-24T20:33:43Z

<p>Created page with &quot;In <a href="/index.php/Object-oriented_programming" title="Object-oriented programming">object-oriented programming</a> with classes, a &#039;&#039;&#039;class variable&#039;&#039;&#039; is a <a href="/index.php?title=Variable_(programming)&amp;action=edit&amp;redlink=1" class="new" title="Variable (programming) (page does not exist)">variable</a> defined in a <a href="/index.php/Class_(computer_programming)" title="Class (computer programming)">class</a> of which a...&quot;</p> <p><b>New page</b></p><div>In [[object-oriented programming]] with classes, a '''class variable''' is a [[Variable (programming)|variable]] defined in a [[Class (computer programming)|class]] of which a single copy exists, regardless of how many [[Instance (computer science)|instances]] of the class exist.<br /> <br /> A class variable is not an instance variable. It is a special type of class attribute (or class property, field, or data member). The same dichotomy between instance and class members applies to methods (&quot;member functions&quot;) as well; a class may have both instance methods and class methods.<br /> <br /> == See also ==<br /> <br /> * [[Class (computer programming)]]<br /> * [[Instance (computer science)]]<br /> * [[Object-oriented programming]]<br /> * [[Variable (programming)]]<br /> <br /> == External links ==<br /> <br /> * [https://en.wikipedia.org/wiki/Class_variable Class variable] @ Wikipedia<br /> <br /> <br /> <br /> [[Category:Computer programming]]</div>

Karl Jones