static void Main(string[] args)
{
Square square = new Square();
square.Draw();
Circle circle = new Circle();
circle.Draw();
Shape[] shapes = new Shape[]
{
new Circle(), new Square(), new Rectange(), new Point(),
};
for (int i = 0; i < shapes.Length; i++)
{
shapes[i].Draw();
shapes[i].GetArea();
}
Point p = new Point();
if (p is Rectange)
{
Rectange r = (Rectange)p;
r.Draw();
Console.WriteLine("True");
}
Console.ReadLine();
}
static void Main(string[] args)
{
Rectange rectange = new Rectange();
rectange.setWidth(5);
rectange.setHeigh(7);
// Print the area of the object.
Console.WriteLine("Total area: {0}", rectange.getArea());
}
static void Fill(int x1, int y1, int x2, int y2)
{
if ((x1 >= x2) || (y1 >= y2))
{
return;
}
Rectange rect = new Rectange(x1, y1, x2, y2);
rect.Draw();
Fill(x1 + 1, y1 + 1, x2 - 1, y2 - 1);
}
static void Main(string[] args)
{
ICovariant <Sharp> isharp = new Sharp();
ICovariant <Rectange> irect = new Rectange();
isharp = irect;
//irect = isharp;
Sharp testShape = isharp.Method1();
int?testNull = null;
testNull = 6;
string strTest = "aaaaaa aaaaa";
strTest.Split(' ');
}
static void Main(string[] args)
{
/*
ICovariant<Sharp> isharp = new Sharp();
ICovariant<Rectange> irect = new Rectange();
//要使下面的语句成立，需要将接口声明为Out
//如果一个泛型接口IFoo<T>，IFoo<TSub>可以转换为IFoo<TParent>的话，我们称这个过程为协变，而且说“这个泛型接口支持对T的协变”。
isharp = irect;
*/
//那我如果反过来呢，考虑如下代码：
ICovariant<Sharp> isharp = new Sharp();
ICovariant<Rectange> irect = new Rectange();
//要使下面的语句成立，需要将接口声明为In
//如果一个泛型接口IFoo<T>，IFoo<TParent>可以转换为IFoo<TSub>的话，我们称这个过程为抗变（contravariant），而且说“这个泛型接口支持对T的抗变”！
irect = isharp;
Console.ReadLine();
}
}//End of Main
//Based on variable and return 'Shape' variable
public static Shape GetObject(int flag)
{
Shape shObj;
if (flag == 1) //Let say '1' is for Squar
{
shObj = new Square();
}
else if (flag == 2) //Let say '2' is for Squar
{
shObj = new Rectange();
}
else if (flag == 3) //Let say '3' is for Triange
{
shObj = new Triangle();
}
else
{
shObj = null;
}
return(shObj);
}
static void Main(string[] args)
{
//----------set some value to abstract class static variables
Shape.counter = 5;
//----------Following statement is not allowed, we can't create Object of abstract class
//Shape shObj = new Shape();
/*----------We can create 'Reference Variable' of abstract class*/
Shape shObj = null;
/*---------Create object of child class and assign it to parent class 'Reference variable' */
Console.WriteLine("--------------Reference Var:Shape, Object:Square-------------------------");
shObj = new Square();
shObj.Show();
shObj.Draw();
shObj.HideMe();
//Call method which takes any object of type 'Shape'
DoSomething(shObj);
Console.WriteLine("-----------------End-------------------------------------");
/*---------Create object of child class and assign it to parent class 'Reference variable' */
Console.WriteLine("--------------Reference Var:Shape, Object:Rectange-------------------------");
shObj = new Rectange();
shObj.Show();
shObj.Draw();
shObj.HideMe();
//Call method which takes any object of type 'Shape'
DoSomething(shObj);
Console.WriteLine("-----------------End-------------------------------------");
/*---------Create object of child class and assign it to parent class 'Reference variable' */
Console.WriteLine("--------------Reference Var:Shape, Object:Triangle-------------------------");
shObj = new Triangle();
shObj.Show();
shObj.Draw();
shObj.HideMe();
//Call method which takes any object of type 'Shape'
DoSomething(shObj);
Console.WriteLine("--------------Type Casting..Reference Var:Triangle, Object:Triangle-------------------------");
//As shObj refering to 'Trainage' object, we can type cast to it 'Triangle'
Triangle triangObj = (Triangle)shObj;
triangObj.Show();
triangObj.Draw();
triangObj.HideMe();
//Call method which takes any object of type 'Shape'
DoSomething(triangObj);
Console.WriteLine("-----------------End-------------------------------------");
/*---------Create object of child class and assign it to child class 'Reference variable' */
Console.WriteLine("--------------Reference Var:Square, Object:Square-------------------------");
Square sqObj = new Square();
sqObj.Show();
sqObj.Draw();
sqObj.HideMe();
//Call method which takes any object of type 'Shape'
DoSomething(sqObj);
Console.WriteLine("-----------------End-------------------------------------");
/*---------Create object of child class and assign it to child class 'Reference variable' */
Console.WriteLine("--------------Reference Var:Rectange, Object:Rectange-------------------------");
Rectange rqObj = new Rectange();
rqObj.Show();
rqObj.Draw();
rqObj.HideMe();
//Call method which takes any object of type 'Shape'
DoSomething(rqObj);
Console.WriteLine("-----------------End-------------------------------------");
/*---------Create object of child class and assign it to child class 'Reference variable' */
Console.WriteLine("--------------Reference Var:Triangle, Object:Triangle-------------------------");
Triangle trObj = new Triangle();
trObj.Show();
trObj.Draw();
trObj.HideMe();
//Call method which takes any object of type 'Shape'
DoSomething(trObj);
Console.WriteLine("-----------------End-------------------------------------");
Console.WriteLine("---------------Custom Object creation----------------------------");
int type = 0;
string choice = "";
do
{
Console.WriteLine("Enter 1 to Create 'Square'");
Console.WriteLine("Enter 2 to Create 'Rectangle'");
Console.WriteLine("Enter 3 to Create 'Triangle'");
//Get a number from user
type = Convert.ToInt32(System.Console.ReadLine());
//Function will return object of type 'Shape' which would be refering to 'Square' or 'Rectange' or 'Trinage'
Shape sObj = GetObject(type);
//Call 'Draw' method. It will be decided at run time based on the available object in 'sObj'
sObj.Draw();
sObj.Show();
Console.Write("Do you want to create again? (Y/N):");
choice = System.Console.ReadLine();
}while (choice == "Y" || choice == "y");
Console.WriteLine("-----------------End-------------------------------------");
/* 'Object' is base class of every class eventually
* so it can hold reference of object of any calls */
Object o1 = new Object();
Object o2 = new Triangle();
Object o3 = new Square();
Object o4 = new Rectange();
//To stop the console so user presses a key to exit application
System.Console.ReadKey();
}//End of Main
