# C#，抽象类和抽象方法，关于多态的应用

（1）创建一个直棱柱抽象类RightPrism（构造方法为Shape类和double型高），以及抽象方法（计算体积GetVolume，计算侧面积GetLateralArea ）。

（2）发挥面向对象的思想，封装出圆柱体（Cylinder）、三棱柱（TrianglarPrism）、正方体(Cube)、长方体(Cuboid)对应的类。

（3）创建各个形状的实例，在控制台中打印出各种形状的侧面积(LateralArea)和体积（Volume）。

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#### 2条回答默认 最新

• 斯洛文尼亚旅游 2021-03-10 21:48
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``````using System;

namespace RightPrism
{
public abstract class Shape
{
public abstract double GetArea();
public abstract double GetCircumference();
}
public class Circle : Shape
{
public double x { get; set; }
public override double GetArea()
{
return Math.Round(Math.PI * Math.Pow(x, 2), 4);
}
public override double GetCircumference()
{
return Math.Round(2 * x * Math.PI, 4);
}
}
public class Rectangle : Shape
{
public double x { get; set; }
public double y { get; set; }
public Rectangle(double x, double y)
{
this.x = x; this.y = y;
}
public override double GetArea()
{
return x * y;
}
public override double GetCircumference()
{
return (x + y) * 2;
}
}
public class Square : Rectangle { public Square(double x) : base(x, x) { } }

public class Triangle : Shape
{
public double x { get; set; }
public double y { get; set; }
public double z { get; set; }
public Triangle(double x, double y, double z)
{
if (x + y > z && x + z > y && y + z > x)
{
this.x = x; this.y = y; this.z = z;
}
else Console.WriteLine(x + "," + y + "," + z + "无法构成三角形！");
}
public override double GetArea()
{
double p = (x + y + z) / 2;
return Math.Round(Math.Sqrt((p * (p - x) * (p - y) * (p - z))), 4);//保留4位小数，保留位数改这里
}
public override double GetCircumference()
{
return x + y + z;
}
}

public abstract class RightPrism
{
public abstract double GetVolume();
public abstract double GetLateralArea();
public Shape p { get; set; }
public double height { get; set; }
public RightPrism(Shape p, double height)
{
this.p = p;
this.height = height;
}
}
public class Cylinder : RightPrism
{
public Cylinder(Shape p, double height) : base(p, height) { }
public override double GetLateralArea() { return Math.Round(p.GetCircumference() * height, 4); }
public override double GetVolume() { return Math.Round(p.GetArea() * height, 4); }
}
public class TrianglarPrism : RightPrism
{
public TrianglarPrism(Shape p, double height) : base(p, height) { }
public override double GetLateralArea() { return Math.Round(p.GetCircumference() * height, 4); }
public override double GetVolume() { return Math.Round(p.GetArea() * height, 4); }
}
public class Cube : RightPrism
{
public Cube(Shape p, double height) : base(p, height) { }
public override double GetLateralArea() { return Math.Round(p.GetCircumference() * height, 4); }
public override double GetVolume() { return Math.Round(p.GetArea() * height, 4); }
}
public class Cuboid : RightPrism
{
public Cuboid(Shape p, double height) : base(p, height) { }
public override double GetLateralArea() { return Math.Round(p.GetCircumference() * height, 4); }
public override double GetVolume() { return Math.Round(p.GetArea() * height, 4); }
}

class Program
{
static void Main(string[] args)
{
RightPrism o = new Cylinder(new Circle { x = 5 }, 5);
Console.WriteLine(String.Format("圆柱体：{0,-15}{1}", "侧面积：" + o.GetLateralArea(), "体积：" + o.GetVolume()));
o = new TrianglarPrism(new Triangle (3,4,5), 5);
Console.WriteLine(String.Format("三棱柱：{0,-15}{1}", "侧面积：" + o.GetLateralArea(), "体积：" + o.GetVolume()));
o = new Cube(new Square(3), 5);
Console.WriteLine(String.Format("正方体：{0,-15}{1}", "侧面积：" + o.GetLateralArea(), "体积：" + o.GetVolume()));
o = new Cube(new Rectangle(3,4), 5);
Console.WriteLine(String.Format("长方体：{0,-15}{1}", "侧面积：" + o.GetLateralArea(), "体积：" + o.GetVolume()));
}
}

}``````
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