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PHP5.0对象模型探索之抽象方法和抽象类PHP学习网

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Release： 2016-06-13 10:03:11
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面向对象程序通过类的分层结构构建起来，在单重继续语言如PHP中，类的继续是树状的. 一个根类有一个或更多的子类，再从每个子类继续出一个或更多下一级子类。当然，可能存在多个根类，用来实现不同的功能。在一个良好设计的体系中，每个根类都应该有一个有用的接口， 可以被应用代码所使用。假如我们的应用代码被设计成与根类一起工作，那么它也可以和任何一个从根类继续出来的子类合作。

　　抽象方法是就像子类中一般的方法的占位符(占个地方但不起作用)，它与一般方法不同

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