abstract {_);
, . abstract , (static). .
, , , class abstract. , . , new .
, . abstract. , abstract , .
, TwoDShape. , TwoDShape Area () TwoDShape abstract. , , , , TwoDShape, Area ().
// , using System;
abstract class TwoDShape { double pri_width; double pri_height;
// , , public TwoDShape() {
Width = Height =0.0; name = "null";
}
// .
public TwoDShape(double w, double h, string n) {
Width = w;
Height = h; name = n;
}
// , public TwoDShape(double , string n) {
Width = Height = x; name = n;
}
// TwoDShape. public TwoDShape(TwoDShape ob) {
Width = ob.Width;
Height = ob.Height; name = ob.name;
}
// , public double Width {
get { return pri_width; }
set { pri_width = value < 0? -value: value; }
}
public double Height {
get { return pri_height; }
set { pri_height = value < 0? -value: value; }
}
public string name { get; set; } public void ShowDimO {
Console.WriteLine(" " +
Width + " " + Height);
}
// Area() , public abstract double Area();
}
// , TwoDShape. class Triangle: TwoDShape { string Style;
// , , public Triangle() {
Style = "null";
}
// Triangle, public Triangle(string s, double w, double h): base(w, h, "") {
Style = s;
I/ , public Triangle(double x): base(x, "") { Style = "";
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}
// Triangle, public Triangle(Triangle ob): base(ob) {
Style = ob.Style;
}
// Area() Triangle, public override double Area() {
return Width * Height / 2;
}
// , public void ShowStyle() {
Console.WriteLine(" " + Style);
}
}
// , TwoDShape class Rectangle: TwoDShape {
// Rectangle, public Rectangle(double w, double h): base(w, h, ""){ }
// , public Rectangle(double x): base (x, "")- { }
// Rectangle, public Rectangle(Rectangle ob): base(ob) { }
// true, // , public bool IsSquare() {
if(Width == Height) return true; return false;
}
// Area() Rectangle, public override double Area() { return Width * Height;
}
}
class AbsShape {
static void Main() {
TwoDShape[] shapes = new TwoDShape[4];
shapes[0] = new Triangle("", 8.0, 12.0); shapes[1] = new Rectangle(10);
shapes[2] = new Rectangle(10, 4); shapes[3] = new Triangle(7.0);
for(int i=0; i < shapes.Length; i++) {
Console.WriteLine(" " + shapes[i].name);
Console.WriteLine(" " + shapes[i].Area());
Console.WriteLine();
}
}
> t
, Area () , . , , Area (). . , TwoDShape - , , TwoDShape . shapes Main () 4 , TwoDShape .
, TwoDShape - ShowDim () abstract. ( ) , . , abstract.
sealed
, . , , , . , , . C# sealed.
, sealed . , abstract sealed, , .
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