public _4_02_Inheritance()
{
Notebook notebook = new Notebook();
notebook.Boot();
notebook.CloseLid();
Computer pc1 = notebook; // 암시적 형변환
pc1.Boot();
pc1.Shutdown();
// 부모 클래스인 Computer가 자식 클래스가 되는 것은 가능하나
// 자식 클래스가 부모 클래스로 되는 것은 불가능하다.
Desktop desktop = new Desktop();
Netbook netbook = new Netbook();
DeviceManager deviceManager = new DeviceManager();
deviceManager.TurnOff(desktop);
deviceManager.TurnOff(netbook);
deviceManager.TurnOff(notebook);
Computer[] machines = new Computer[] { new Notebook(), new Desktop(), new Netbook() };
foreach (Computer device in machines)
{
deviceManager.TurnOff(device);
}
}
static void Main(string[] args)
{
Notebook notebook = new Notebook();
Computer pc1 = notebook; //암시적 형변환 가능
pc1.Boot();
pc1.Shutdown();
Computer pc = new Computer();
//Notebook notebook = (Notebook)pc; //명시적 형변환, 컴파일은 가능 실행하면 오류 발생
notebook = new Notebook();
pc1 = notebook; //부모 타입으로 암시적 형변환
Notebook note2 = (Notebook)pc1; //다시 본래 타입으로 명시적 형변환
note2.CloseLid();
}
static void Main(string[] args)
{
Computer pc = new Computer();
Notebook notebook = pc as Notebook;
if (notebook != null)
{
notebook.CloseLid();
}
// int n = 5;
// if((n as string) != null)
int n = 5;
if (n is string)
{
Console.WriteLine("n is string");
}
}
static void Main(string[] args)
{
#region 155
// 암시적 형변환
//Computer[] machines = new Computer[] { new Notebook(), new Desktop(), new Netbook() };
//DeviceManager manager = new DeviceManager();
//foreach (Computer device in machines)
//{
// manager.TurnOff(device);
//}
#endregion 155
Computer pc = new Computer();
Notebook notebook = pc as Notebook;
if (notebook != null) // 코드대로라면 if 문 내부의 코드가 실행될 가능성은 없다.
{
notebook.CloseLid();
}
}