子类继承父类 测试

自己写的测试  .

总结如下：无论子类是无参还是有参，都要继承父类的无参构造函数。且父类的无参构造函数不能省略。。

 

 

using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace ConsoleApplication1{ public class A { public A() { Console.WriteLine("A()"); } public A(int i) { Console.WriteLine("A(i)" + i); } } public class B : A { public B() { Console.WriteLine("B()"); } public B(int i) { Console.WriteLine("B()" + i); } } public class Program { static void Main(string[] args) { //A a = new A(); B b = new B(); A a = new A(); A a1 = new A(4); Console.ReadLine(); } }}