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If you are using the Visual Studio IDE, then simply add all three files to your C# project One other point: It is perfectly valid to put all three of these classes in the same file, too The output from this program is shown here:
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Next Next Next Next Next value value value value value is is is is is 2 4 6 8 10
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Resetting Next value Next value Next value Next value Next value
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It is both permissible and common for classes that implement interfaces to define additional members of their own For example, the following version of ByTwos adds the method GetPrevious( ), which returns the previous value:
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// Implement ISeries and add GetPrevious() class ByTwos : ISeries { int start; int val; int prev; public ByTwos() { start = 0; val = 0; prev = -2; } public int GetNext() { prev = val; val += 2; return val; } public void Reset() { start = 0; val = 0; prev = -2; } public void SetStart(int x) { start = x; val = x; prev = x - 2; } // A method not specified by ISeries int GetPrevious() { return prev; } }
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Add a method not defined by ISeries
Notice that the addition of GetPrevious( ) required a change to implementations of the methods defined by ISeries However, since the interface to those methods stays the same, the change is seamless and does not break preexisting code This is one of the advantages of interfaces As explained, any number of classes can implement an interface For example, here is a class called ByThrees that generates a series of numbers, each three greater than the previous one:
// Implement ISeries class ByThrees : ISeries { int start; int val;
Implement ISeries a different way
9: Interfaces, Structures, and Enumerations
public ByThrees() { start = 0; val = 0; } public int GetNext() { val += 3; return val; } public void Reset() { start = 0; val = 0; } public void SetStart(int x) { start = x; val = x; } }
Using Interface References
You might be somewhat surprised to learn that you can declare a reference variable of an interface type In other words, you can create an interface reference variable Such a variable can refer to any object that implements its interface When you call a method on an object through an interface reference, it is the version of the method implemented by the object that is executed This process is similar to using a base class reference to access a derived class object, as described in 8 The following example illustrates the use of an interface reference It uses the same interface reference variable to call methods on objects of both ByTwos and ByThrees For clarity, it shows all the pieces assembled into one file
// Demonstrate interface references using System; // Define the interface public interface ISeries { int GetNext(); // return next number in series void Reset(); // restart void SetStart(int x); // set starting value } // Implement ISeries one way class ByTwos : ISeries { int start; int val;
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public ByTwos() { start = 0; val = 0; } public int GetNext() { val += 2; return val; } public void Reset() { start = 0; val = 0; } public void SetStart(int x) { start = x; val = x; } } // Implement ISeries another way class ByThrees : ISeries { int start; int val; public ByThrees() { start = 0; val = 0; } public int GetNext() { val += 3; return val; } public void Reset() { start = 0; val = 0; } public void SetStart(int x) { start = x; val = x; } }
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