// Static method that creates concrete object but declares return base type
// Factory method pattern
public static D2Shape ScaleD2Shape(D2Shape d2Shape, double ratio)
{
D2Shape scaledShape = d2Shape.Clone();
scaledShape.Scale(ratio);
return(scaledShape);
}
static void Main(string[] args)
{
PrintBreak();
Rectangle r1 = new Rectangle(10, 5);
//Constructor D2Shape (1) called
//Constructor Rectangle (1) called
//Call Rectangle constructor with two parameters: (10, 5)
RectangularTriangle rt1 = new RectangularTriangle(10, 5);
//Constructor D2Shape (2) called
//Constructor RectangularTriangle (2) called
Console.WriteLine(r1.PrintShape()); // Area of Rectangle (10,5) is = 50
Console.WriteLine(rt1.PrintShape()); // Area of RectangularTriangle (10,5) is = 25
Console.WriteLine("\nProtected type or member can be accessed only by code in the same class, or in a class that is derived from that class");
//Console.WriteLine(r1._objectNumber); // Compilation error -> 'D2Shape._objectNumber' is inaccessible due to its protection level
Console.WriteLine(r1.ExampleOfPublicField);
Console.WriteLine(r1.ExampleOfInternalField);
Console.WriteLine("\nStatic member is callable on a class");
Console.WriteLine("Only one copy of a static member exists");
Console.WriteLine($"Value from static field: {D2Shape.NumberOfCreatedObjects}");
Console.WriteLine("\nStatic methods and properties cannot access non-static fields and events in their containing type");
D2Shape scaledR1 = D2Shape.ScaleD2Shape(r1, 2);
Console.WriteLine(scaledR1.PrintShape());
PrintBreak();
//2. Polymorphism
// Creating objects but declare them as base class
// object method is called not the base one
D2Shape r2 = new Rectangle(10, 5);
D2Shape rt2 = new RectangularTriangle(10, 5);
// This works because we used override keyword. Method is called on object instance type
Console.WriteLine(r2.PrintShape()); // Area of Rectangle (10,5) is = 50
Console.WriteLine(rt2.PrintShape()); // Area of RectangularTriangle (10,5) is = 25
PrintBreak();
//3. Finalizers
// Run when object is removed by GC
Finalizers();
// Force to call GC to show Finalizers
GC.Collect();
GC.WaitForPendingFinalizers();
PrintBreak();
//4. Students work - Circle
// Go to Classes file and add Circle inheriting from D2Shape
// Uncomment code below
Circle c1 = new Circle(5);
Console.WriteLine(c1.PrintShape()); // Circle area (5) is =78,53981633974483
Console.WriteLine(c1.CalculateCircuit()); // 31,41592653589793
D2Shape c2 = D2Shape.ScaleD2Shape(c1, 5);
Console.WriteLine(c2.PrintShape()); // Circle area (25) is =1963,4954084936207
// Console.WriteLine(c2.CalculateCircuit()); // Not accessible for c2 -> why?
Console.WriteLine("End of Main method");
PrintBreak();
// Virtual hierarchy testing (from virtual.cs):
E e = new E();
B b = new E();
Console.WriteLine();
e.fun_v1(); // E_V1
e.fun_v2(); // E_V2
e.fun_nv(); // E_NV
Console.WriteLine();
b.fun_v1(); // E_V1
b.fun_v2(); // D_V2
b.fun_nv(); // B_NV
}
