掌握类的声明和定义。

2．理解静态成员和非静态成员变量的区别。

3．掌握类构造方法的编写。

4．实现类的方法。

5．掌握创建类实例的方法。

6．掌握类的声明格式和多种封装措施，理解对象的引用模型。

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Master class declarations and definitions.

2 understand the difference between static and non static member variables.

3 master the method of class structure.

4 implementation of the class method.

5 master the method of creating a class instance.

6 master the class declaration format and a variety of packaging measures to understand the object reference model