public class Plane {
public virtual double TopSpeed() { return 300.0D;}
public static bool operator>(Plane one, Plane two) {
return one.TopSpeed() > two.TopSpeed();
}
public static bool operator<(Plane one, Plane two) {
return one.TopSpeed() < two.TopSpeed();
}
}
class Jet : Plane {
public override double TopSpeed() { return 900.0D; }
public override string ToString() { return "I'm a Jet"; }
}
class Airport {
[STAThread]
static void Main(string[] args) {
Console.WriteLine("plane's top speed: {0}",plane.TopSpeed());
Console.WriteLine("jet's top speed: {0}",jet.TopSpeed());
Console.WriteLine("Plane > Jet = {0}", plane > jet);
Console.ReadLine();
}
}
//csharp/4821