学步园

 using System;<br /> using System.Collections.Generic;<br /> using System.Text;</p> <p>namespace ConsoleApplication1<br /> {<br /> class 继承1<br /> {<br /> //virtual虚函数,这样写便于子类重写<br /> public virtual double Area(double a)<br /> {<br /> return a * 2;<br /> }<br /> }<br /> class Test : 继承1<br /> {<br /> //重写父类的Area,当然也可以调用父类的Area方法<br /> public override double Area(double b)<br /> {<br /> //关键字base.Area()调用了父类的Area方法<br /> return base.Area(b) * 0.9;<br /> }<br /> }<br /> class Result<br /> {<br /> static void Main()<br /> {<br /> Test TT = new Test();<br /> Console.WriteLine(TT.Area(10));<br /> }<br /> }<br /> }<br />

using System;<br /> using System.Collections.Generic;<br /> using System.Text;</p> <p>namespace ConsoleApplication1<br /> {<br /> class Class4<br /> {<br /> //申明2个构造函数<br /> public Class4()<br /> {<br /> Console.WriteLine("Class4");<br /> }<br /> int i;<br /> public Class4(int a)<br /> {<br /> i=a;<br /> Console.WriteLine("Class:{0}", i);<br /> }<br /> public void SS()<br /> {<br /> Console.WriteLine("BOSS");<br /> }<br /> }<br /> class Test:Class4<br /> {<br /> //调用父类(无参数的)构造函数<br /> public Test()<br /> : base()<br /> { </p> <p> }<br /> //调用父类(有参数的)构造函数<br /> public Test(int a)<br /> : base(a)<br /> {<br /> base.SS();<br /> }<br /> }<br /> class TT<br /> {<br /> static void Main()<br /> {<br /> Test T = new Test();<br /> Test T1 = new Test(10);<br /> }<br /> }<br /> }<br />