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Extending Interfaces
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An interface can inherit from another interface You may wish to add more functionality to the interface and keep the original less-specific interface as it is This follows the principles of inheritance that we have covered so far and should come as no surprise In our IFeedable example, we could decide to create derived interfaces for ISnakeFeedable and ILionFeedable Let s look at one of these:
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interface ISnakeFeedable: IFeedable { void FeedSnake(); }
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In our Zoo example, we can now implement either IFeedable or ISnakeFeedable, whichever is appropriate for the work we are doing Keep in mind, however, that any class implementing ISnakeFeedable must implement FeedSnake(), FillContainer(), and Feed() By virtue of the contract, you must implement the derived interface methods as well as the base interface There is a lot more to interfaces than is described in this chapter As we move into Parts III and IV of this book, you will come to appreciate the many uses of interfaces
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Overloading
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Although it is arguably not a concept related to inheritance (or even object-oriented programming), it is a good idea to discuss overloading methods and operators at this point We have skirted around the issues up to now, so it s time that we formalized the discussion When you want a particular method to accept different parameters in different cases, you can overload the method As a matter of interest, many of the methods you have
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been using so far in this book are overloaded Consider the method WriteLine() from the SystemConsole class You may want to print a string one time and an integer another time You may also want to print the data of an object Wouldn t it be awful if you had to memorize a method for each one of these different ways of printing Fortunately, you don t have to The WriteLine() method is overloaded as follows:
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public public public public static static static static void void void void WriteLine WriteLine WriteLine WriteLine (); (int); (char); (object);
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This is actually a subset of the WriteLine() methods in the SystemConsole class There are 18 overloaded methods available to help you You can create as many overloaded method definitions as you like there is no practical limit You may have noticed the primary difference between each one of these method declarations the parameters are different This is one of the rules of using overloaded methods They must declare different parameter lists, and different is defined as follows: Different parameters, such as void MyMethod (int) and void MyMethod(char) Different number of parameters, such as void MyMethod (char, int) Different order of parameters, such as void MyMethod (int, char) One other note to make here is that the return type doesn t make a difference That is to say that the following two methods are considered the same and not overloaded:
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void MyMethod(int) float MyMethod(int)
However, the preceding code would cause a compiler error, since the return types are different but the rest of the method signature is not Constructors can be overloaded as well As we ve seen before in code, it may be necessary to initialize an object differently under different circumstances To illustrate this, think of an Employee class There are times when you instantiate the Employee object and you know the employee s name and start date; but there may be times when you only know the employee s name
class Employee { // data declarations public Employee(string name) { // assign the passed name to the data field } public Employee (string name, int start) { // assign the passed name and start to the data fields } }
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