This print for content only-size & color not accurate 7" X 9-1/4" / casebound / malloy

// Models the ability to render a type in stunning 3D.

public interface IDraw3D

{

void Draw3D();

}

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Next, assume that two of your three shapes (Circle and Hexagon) have been configured to sup-

port this new behavior:

// Circle supports IDraw3D.

public class Circle : Shape, IDraw3D

{

...

public void Draw3D()

{

Console.WriteLine("Drawing Circle in 3D!"); }

}

// Hexagon supports IPointy and IDraw3D.

public class Hexagon : Shape, IPointy, IDraw3D

{

...

public void Draw3D()

{

Console.WriteLine("Drawing Hexagon in 3D!"); }

}

Figure 9-4 presents the updated Visual Studio 2008 class diagram.

Figure 9-4.

The updated shapes hierarchy

If you now define a method taking an IDraw3D interface as a parameter, you are able to effec-

tively send in any object implementing IDraw3D (if you attempt to pass in a type not supporting the

necessary interface, you receive a compile-time error). Consider the following method defined

within your Program type: