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		<title>冒号论坛 &#187; Tag: data-abstraction - Recent Topics</title>
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		<description>冒号论坛 &raquo; Tag: data-abstraction - Recent Topics</description>
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		<pubDate>Fri, 10 Sep 2010 04:15:48 +0000</pubDate>
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			<title>Todd on "抽象是什么？"</title>
			<link>http://bbs.zhenghui.org/topic/%e6%8a%bd%e8%b1%a1%e6%98%af%e4%bb%80%e4%b9%88%ef%bc%9f#post-5</link>
			<pubDate>Fri, 01 Jan 2010 13:30:06 +0000</pubDate>
			<dc:creator>Todd</dc:creator>
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			<description>&#60;p&#62;看了本书以后，我对“抽象”的感觉提高了。但对于程序设计来讲，到底抽象是什么呢？我现在的答案是“抽象就是变化中的不变”。封装，继承，多态，还有设计原则和设计模式是帮助把不变显式化的机制。
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