Design principles: Validates that your code adheres to the design principles of object-oriented programming.

设计原则：验证你的代码是否坚持面向对象编程的设计原则。

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Many of the principles are also applicable to other programming languages, as a lot of the principles of good software design are universal ones.

书中的许多准则对其他编程语言也同样适用，正如优秀软件设计的大量理念都是通用的。

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Due to the wonders of object-oriented programming and the principles of design by interface, you can simply replace your original ContactDAOMock with the new ContactJdoDAO.

通过面向对象的编程和接口设计原则，您只需使用新的ContactJdoDAO替代原始的ContactDAOMock。

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