C#控制台应用程序（构建抽象类及其派生类，密封类）

16的

using System;
using System.Collections.Generic;
namespace ConsoleApp1
{
    public abstract class Shape {
        private string name;
        public string Name { get { return name; } }
        public abstract float GetArea();
        public Shape(string name) { this.name = name; }
    }
    public class Circle : Shape
    {
        private float r;
        public Circle(float r):base("圆形") { this.r = r; }
        public override float GetArea()
        {
            return (float)(Math.PI * Math.Pow(r, 2));
        }
    }
    public class Rectangle : Shape
    {
        private float l;
        private float w;
        public Rectangle(float l, float w) : base("矩形")
        {
            this.l = l;
            this.w = w;
        }
        public override float GetArea()
        {
            return l * w;
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Circle c = new Circle(5);
            Console.WriteLine(c.Name + "面积：" + c.GetArea());

            Rectangle r= new Rectangle(4,5);
            Console.WriteLine(r.Name + "面积：" + r.GetArea());


            Console.ReadKey();
        }
    }
}

17

using System;
namespace ConsoleApp1
{
    public class myClass1
    {
        public virtual void ShowInfo()
        {
            Console.WriteLine("myClass1 ShowInfo");
        }
    }
    public sealed class myClass2 : myClass1
    {
        public string No { get; set; }
        public string Name { get; set; }
        public sealed override void ShowInfo()
        {
            Console.WriteLine("{0}\t{1}", No, Name);
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            myClass2 c = new myClass2() { No = "BM100001", Name = "TM" };
            c.ShowInfo();
            Console.WriteLine("请按任意键继续...");
            Console.ReadKey();
        }
    }
}

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