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面向对象三大特征封装含义：封装就是把同一类事物的共性（包括属性和方法）归到同一类中，方便使用。实现： 1.对成员变量进行私有化（使用private修饰）； 2.写成员变量对应的getter/setter方法（用于属性的读写&#...

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