在面向对象程序设计语言中__( )__是利用可重用成分来构造软件系统最有效特性。
- A.封装
- B.继承
- C.多态
- D.对象
正确答案及解析
正确答案
解析
对象：是基本运行时实体，既包括数据（属性），也包括（行为）类：类所包含方法和数据描述一组对象共同行为和属性；类是在对象之上抽象，对象是类具体化，是类实例消息：对象之间进行通信一种构造继承：父类和子类之间共享数据和方法机制；这是类之间一种关系，在定义和实现一个类时候，可以在一个已经存在类基础上来进行，把这个已经存在类所定义内容作为自己内容，并加入若干新内容。封装：将数据和操作数据函数衔接在一起，构成一个具有类型对象描述多态性：是多种表现形式；多态性实现，一般通过在派生类中重定义基类虚函数来实现；多态，在收到消息时，对象要予以响应，不同对象收到同一消息，可以产生完全不同结果，这一现象就做多态；在使用多态时候用户可以发送一个通用消息，而实现细节则由接收对象自行决定。这样，同一消息就可以调用不同方法。
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