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Accessibility and Visibility Modifiers
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NOTE Remember, if a constructor is not coded, C# provides a default constructor (one with no parameters and no implementation) If you code a constructor, you are telling C# to forget its default constructor Therefore, if you want a no parameter, no implementation constructor, you would have to code it as well The bottom line is this: There must be a constructor You either code it or C# provides one for you If you code one, C# will not provide one for you Remember that you can have multiple constructors, each having a different parameter list The one that C# provides (if no constructor is explicitly coded) has no parameters and no implementation But if you code a constructor any constructor then you must code the no-parameter constructor if you need it If there is no constructor provided in the base class, C# calls its default constructor before calling the default constructor of the derived class Let s look at a simple example:
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public class Animal { public Animal() { SystemConsoleWriteLine ("Constructor with no parameters"); } public Animal (int i) { SystemConsoleWriteLine ("Constructor with an integer parameter"); } } class Dog: Animal { public Dog() { SystemConsoleWriteLine ("Dog constructor with no parameters"); } public Dog (int j) { SystemConsoleWriteLine ("Dog constructor with an integer parameter"); } } class EntryPoint { public static void Main() { Animal a = new Animal(); Animal a1 = new Animal(12); Dog d = new Dog(); Dog d1 = new Dog(12); } }
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3: Advanced Object-Oriented Concepts
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Let s examine the sequence of events: PART I 1 When the line Animal a = new Animal(); is called, the parent constructor with no parameters (public Animal()) is called 2 When the line Animal a1 = new Animal(12); is called, the parent constructor with an integer parameter (public Animal (int i)) is called 3 The next line Dog d = new Dog(); calls the parent constructor (public Animal()) with no parameters and then the derived constructor (public Dog()) with no parameters 4 The line Dog d1 = new Dog(12); causes the parent constructor (public Animal(int i)) to be called, and then the Dog constructor (public Dog (int j)) is executed The output from the EntryPoint class is shown in Figure 3-3 Notice, in this example, that we have more than one constructor for each of the classes This is called overloading the constructors and is a concept that we will deal with in the Overloading section, later in the chapter TIP If you are confused as to why the second-last line of output is from the no-args parent constructor, consider that you must explicitly call a particular base constructor if you want one other than the default For example, in order to explicitly call the constructor with an integer parameter, you must code base (12); in the Dog constructor
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Figure 3-3 Output from executing Constructorcs
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The has a Relationship
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The other class relationship within OOP that we need to examine is the has a relationship Simply put, it means that one class uses as its data an instance of another class For example, think of a car and its parts A car has a steering wheel and has an engine These could all be separate classes that make the whole object, as follows:
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class SteeringWheel { // the data and methods of a steering wheel } class Engine { // the data and methods of an engine } class Car { SteeringWheel s; Engine e; // the rest of the data and methods specific to the car }
Any class file that has instances of other classes as its data is considered to be part of the has a relationship
SystemObject The GrandDaddy of Them All
Every class inherits from the top base class SystemObject Even if you declare that your class inherits from another class, as in our example class Dog: Animal, your derived class ultimately inherits from SystemObject Let s examine the sequence of events: 1 The call is made to build the object Dog d = new Dog(); 2 The parent constructor, public Animal() is called first 3 It, in turn, calls its parent constructor public Object() 4 The constructor for Object is executed 5 The constructor for Animal is executed 6 The constructor for Dog is executed As you can see, it is important to understand the methods that are inherited from SystemObject The first thing to note is that the constructor is a no parameter, no implementation constructor So, if you were worried about what actually happens in Step 4, you can relax The only thing that happens is that an object of type Object is built There is no data associated with SystemObject However, there are some methods that will concern you These methods should become second nature to you, and it s quite possible that Microsoft will test your knowledge of them
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