摘要:
1、 abstract class Animal { public abstract void eat(); public abstract void bark(); } class Dog : Animal { public override void eat() { Console.WriteL 阅读全文
摘要:
class person //默认不写继承基类object,只能继承一个类。类的单根性。 { public string Name { get; set; } public int Age { get; set; } public int Hight { get; set; } public voi 阅读全文