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namespace Exercise_13_4 { interface IConvertible
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Appendix: Answers to Quizzes and Exercises
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Example A-37. Our solution to Exercise 13-4 (continued)
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{ string ConvertToCSharp( string stringToConvert ); string ConvertToVB( string stringToConvert ); } interface ICodeChecker : IConvertible { bool CheckCodeSyntax( string stringToCheck, string whichLang ); } public class ProgramConverter : IConvertible { public ProgramConverter( ) // constructor { Console.WriteLine( "Creating ProgramConverter" ); } public string ConvertToCSharp( string stringToConvert ) { Console.WriteLine( "Converting the string you passed in to CSharp syntax" ); return "This is a C# string."; } public string ConvertToVB( string stringToConvert ) { Console.WriteLine( "Converting the string you passed in to VB syntax" ); return "This is a VB string."; } } public class ProgramHelper : ProgramConverter, ICodeChecker { public ProgramHelper( ) // constructor { Console.WriteLine( "Creating ProgramHelper" ); } public bool CheckCodeSyntax( string stringToCheck, string whichLang ) { switch ( whichLang ) { case "CSharp": Console.WriteLine("Checking the string {0} for C# Syntax", stringToCheck ); return true; case "VB": Console.WriteLine("Checking the string {0} for VB Syntax", stringToCheck ); return true; default:
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13: Interfaces |
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Example A-37. Our solution to Exercise 13-4 (continued)
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return false; } } } class Tester { static void Main( ) { Tester t = new Tester( ); t.Run( ); } public void Run( ) { ProgramConverter[] converters = new ProgramConverter[4]; converters[0] = new ProgramConverter( ); converters[1] = new ProgramHelper( ); converters[2] = new ProgramHelper( ); converters[3] = new ProgramConverter( ); foreach ( ProgramConverter pc in converters ) { string vbString = pc.ConvertToCSharp( "This is a VB string to convert."); Console.WriteLine( vbString ); ProgramHelper ph = pc as ProgramHelper; if ( ph != null ) { ph.CheckCodeSyntax( vbString, "VB" ); } else { Console.WriteLine( "No vb syntax check not a Program helper" ); } string cSharpString = pc.ConvertToCSharp( vbString ); Console.WriteLine( cSharpString ); if ( ph != null ) { ph.CheckCodeSyntax( vbString, "CSharp" ); } else { Console.WriteLine( "No csharp syntax check not a Program helper" ); } } } } }
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Appendix: Answers to Quizzes and Exercises
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14: Generics and Collections
Quiz Solutions
Solution to Question 14-1. Indexers are unnamed. You use the this keyword to create an indexer:
public string this[int index]
Solution to Question 14-2. Any type can be used, although it s most common to use integers. Solution to Question 14-3. The elements of the collection that you want to sort must implement IComparable. Solution to Question 14-4. Generics allow you to create type-safe collections without specifying the type the collection will hold when you create the collection. Solution to Question 14-5. The IEnumerable<T> interface allows your collection to support a foreach loop. Solution to Question 14-6. The purpose of the yield keyword is to return a value to the IEnumerator object, within the GetEnumerator( ) method. Solution to Question 14-7. The size of an array is fixed when you create it. A List<T> expands dynamically when you add more elements. Solution to Question 14-8. The Capacity property of a List indicates the number of elements that the List has room for. The Capacity is increased automatically when more elements are added. Solution to Question 14-9. A Stack is a last-in, first-out collection, and a Queue is a first-in, first-out collection. In a Queue, elements are removed in the same order they were inserted. In a Stack, elements are removed in the opposite order. Solution to Question 14-10. The key in a Dictionary takes the place of an indexer, and allows you to retrieve the associated value. The key can be any type, but it s usually short. The value is usually a much larger or more complex object associated with the key.
14: Generics and Collections |
Exercise Solutions
Solution to Exercise 14-1. Create an abstract Animal class that has private members weight and name, and abstract methods Speak( ), Move( ), and ToString( ). Derive from Animal a Cat class and a Dog class that override the methods appropriately. Create an Animal array, populate it with Dogs and Cats, and then call each member s overridden virtual methods. The purpose of this exercise is to set up the rest of the exercises in this chapter, and to remind you of how to use arrays and indexers polymorphically. The Animal, Dog, and Cat classes are simple enough to create, although you should remember to make the appropriate methods of Animal abstract. You then need to override those abstract methods in Dog and Cat. In Run( ), you need to allocate enough space for the array of animals, to use a loop (a foreach works well), and to call the overridden virtual methods on each element as an Animal. In our case, we also added a method that only Cat objects have (Purr( )). Within the foreach loop, we cast each Animal to Cat, and if the cast succeeds, call the Purr( ) method. Example A-38 shows how we did it.
Example A-38. One solution to Exercise 14-1
using using using using System; System.Collections.Generic; System.Linq; System.Text;
namespace Exercise_14_1 { abstract public class Animal { protected int weight; protected string name; public Animal(int weight, string name) { this.weight = weight; this.name = name; } abstract public void Speak( ); abstract public void Move( ); abstract public override string ToString( ) } public class Dog : Animal { public string Breed { get; set; } public Dog(int weight, string name, string breed) : base(weight, name) { this.Breed = breed; } public override void Speak( )
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