overriding abstract methods in an inherited abstract class

Question

Okay so basically I have the following problem: I\'m trying to have an abstract class inherit another abstract class that has an abstract method, but I don\'t want to implement

Answer 1

You don't need to declare execute() in the Binary class since it's already inherited from Command. Abstract methods don't need to be implemented by other abstract classes - the requirement is passed on to the eventual concrete classes.

public abstract class Command
{
    public abstract object execute();
}

public abstract class Binary : Command
{
    //the execute object is inherited from the command class.
}

public class Multiply : Binary
{
    public override object execute()
    {
        //do stuff
    }
}

Answer 2

Just omit the declaration of execute() in Binary at all. Since Binary is abstract as well, you don't have to implement any abstract methods of its ancestors.