抽象类的运用,举了一个很典型的例子，希望能给大家有所启发-The use of abstract class, gave a typical example of hope that they can inspire

是Lab3的作业，里边有Dog,Rectangle，counter等类,Dog中的信息是名称，毛发等，R是只要计算-Is Lab3 job, inside Dog, Rectangle, counter and other categories, Dog of the information is the name, hair, etc., R is calculated as long as