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什么是XML？
XML (Extensible Markup Language) is a buzzword you will see everywhere on the Internet, but it’s also a rapidly maturing technology with powerful real-world applications, particularly for the management, display, and organization of data. Together with its many related technologies, which are covered in later chapters, XML is an essential technology for anyone working with data, whether publicly on the web or privately within your own organization. This chapter introduces you to some XML b
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什么是继承？
什么是继承？[@more@] 不同种类的对象彼此之间经常有一定数量的相同之处。例如，山地自行车、公路自行车和双人自行车都共享了自行车的特征(当前的速度、当前的踏板节奏、当前的齿轮档)。而每种自行车自身也定义了另外的特性以互相区别：双人自行车有2个座位和2副车把；公路自行车有赛车车把；一些山地自行车有另外的链环，以降低它们的齿轮比率。 面向对象程序设计允许类从其它类继承共同使用的状态和行为。在这个例子中，Bicycle现在成为MountainBike、RoadBike和TandemBike的超类。在Java程序设计语言中，每个类只允许有1个直接
