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Test Your Knowledge: Exercises
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Exercise 13-1. Define an interface IConvertible that indicates that the class can convert a block of code to C# or VB. The interface should have two methods: ConvertToCSharp and ConvertToVB. Each method should take a string and return a string.
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13: Interfaces
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Exercise 13-2. Implement that interface and test it by creating a class ProgramHelper that implements IConvertible. You don t have to write methods to convert the string; just use simple string messages to simulate the conversion. Test your new class with a string of fake code to make sure it works. Exercise 13-3. Extend the IConvertible interface by creating a new interface, ICodeChecker. The new interface should implement one new method, CodeCheckSyntax, which takes two strings: the string to check and the language to use. The method should return a bool. Revise the ProgramHelper class from Exercise 13-2 to use the new interface. Exercise 13-4. Demonstrate the use of is and as. Create a new class, ProgramConverter, which implements IConvertible. ProgramConverter should implement the ConvertToCSharp( ) and ConvertToVB( ) methods. Revise ProgramHelper so that it derives from ProgramConverter and implements ICodeChecker. Test your class by creating an array of ProgramConverter objects, some of which are ProgramConverters and some of which are ProgramHelpers. Then call the conversion methods and the code check methods on each item in the array to test which ones implement ICodeChecker and which ones do not.
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Test Your Knowledge: Exercises |
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14 14 CHAPTER
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Generics and Collections
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You saw in 10 that arrays are useful for when you have a group of objects of the same type, and you need to treat them as a group as a collection. Arrays are the simplest collection in C#, and they re the one that you learn when you re starting out, to get you accustomed to thinking about collections. However, arrays are probably the least flexible of the standard collections used in C#, because you have to define the size of an array when you create it. C# actually has a bunch of collection classes, but the five most commonly used are: Array List Stack Queue Dictionary This chapter will introduce each of the latter four collections, and will show how the C# feature called generics is used to make these collections type-safe and why type safety is important. You can also create classes that act like collections, and you can provide support for your collection classes so that they support some or all of the behavior expected of collections, such as the ability to be used in a foreach loop or to access their members using an indexer:
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Generics
Before generics, all the collection classes (then just ArrayList, Stack, and Queue) were defined to hold objects of type Object (the root class). Thus, you could add integers and strings to the same collection, and when you took items out of the collection, you had to cast them to their real type. This was ugly, and it was error-prone (the compiler could not tell whether you had a collection of integers and added a string).
With generics, the designer of the class (the person who creates the Stack class) can say, This class will hold only one type, and that type will be defined by the developer who makes an instance of this class. The user of the generic Stack class (that s you) defines an instance of the Stack and the type it will hold. The compiler can now enforce that only objects of the designated type are stored in the collection that s type safety. That s important because, as you ve seen, you ll often want to use a collection polymorphically, and if there s a string lurking in what you think is a collection of ints, you may be surprised when you try to divide each of them by 2. The designer adds a type placeholder (technically called a type parameter), which is usually represented by the letter T in angle brackets:
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