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2answers
60 views

Null Object pattern with simple class hierarchy

I have a simple two-class hierarchy to represent U.S. ZIP (12345) and ZIP+4 (12345-1234) codes. To allow clients to allow both types for a field/parameter or restrict it to one type or the other, the ...
1
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0answers
40 views

Hardware resource Open/Close methods

So I'm making a program that is a serial port wedge. In other words I want it to listen to a serial port. If data comes in, wait a given amount of time, then play a sound and finally send the data ...
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4answers
132 views

Understanding Interface

//program.cs class Program { static void Main(string[] args) { Dog oDog = new Dog(); Console.WriteLine(oDog.Cry()); Cat oCat = new Cat(); ...
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1answer
97 views

Is this the proper way to find the subclass of a polymorphic superclass?

I came across polymorphism in the book that I'm reading and decided to do a little experiment. Essentially what I did was to create a base class called Asset and two subclasses that derive from Asset, ...