static void Main()
{
DerivedClass o = new DerivedClass();
o.AbstractMethod();
Console.WriteLine("x = {0}, y = {1}", o.X, o.Y);
}
static void Main()
{
var o = new DerivedClass();
o.AbstractMethod();
Console.WriteLine($"x = {o.X}, y = {o.Y}");
}
static void Main()
{
DerivedClass o = new DerivedClass(); //注意抽象类是不能实例化的，其派生类是可以实例化的
o.AbstractMethod();
Console.WriteLine("x = {0}, y = {1}", o.X, o.Y);
Console.ReadKey();
}
static void Main()
{
// below code is WRONG as Abstract class cannot be instantiated
// BaseClass b = new BaseClass();
DerivedClass o = new DerivedClass();
o.AbstractMethod();
Console.WriteLine("x = {0}, y = {1}", o.X, o.Y);
}
static void Main(string[] args)
{
Console.WriteLine("\n11. Differences between an abstract class and an interface \n------------------------------------");
// Instantiate using an Abstract class
DerivedClass o = new DerivedClass();
o.AbstractMethod();
Console.WriteLine("- using an abstract class: w = {0}", o.W);
// Instantiate using an Interface class
Point pt = new Point(2, 3);
Console.Write("- using an interface class: Point is " + pt.GetType() + "\n");
pt.PrintPoint(pt);
}
static void Main()
{
DerivedClass o = new DerivedClass();
o.AbstractMethod();
Console.WriteLine("x = {0}, y = {1}", o.X, o.Y);
}
