[单选题]面向对象程序设计方法把程序设计的焦点集中在( ) 。

A、对象和类的设计与实现
B、类和类层次结构的设计、实现和重用
C、方法、消息和继承性的设计与实现
D、数据和方法的封装

参考答案： B

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