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Every nonstatic method of a class has an implicit this variable passed into the method. Static members are associated with the class itself, not with a particular instance. Static members are declared with the keyword static, and are invoked through the class name. Static methods do not have a this parameter because there is no instance to refer to. C# does not specifically require a finalizer method in your classes because the framework will destroy any object that is not in use. You should provide a Dispose( ) method if your class uses unmanaged resources. Local value type variables are created on the stack. When the method ends, these variables go out of scope and are destroyed. Objects are reference types, and are created on the heap. When you declare an instance of a reference type, you are actually creating a reference to that object s location in memory. If you declare a reference to an object on the heap within a method, when the method ends that reference is destroyed. If there are no remaining references to the object on the heap, the object itself is destroyed by the garbage collector at some later time. You can define a reference to an existing object by declaring the class and an identifier and then assigning to that identifier an existing object; the two identifiers now both refer to the same (unnamed) object on the heap. You spent the preceding chapter learning the theory, and now you ve seen some of the practice behind the most powerful concept in C#. Hopefully by this point, you ve seen how you can model just about anything with carefully defined classes and methods. You may have noticed a few limitations of the methods we ve shown you so far, though. For example, methods can return only a single value what if you want to manipulate and return two or more values Or what if you re not quite sure how many parameters you ll have when you call the method Maybe you ll create a Dog object with a name and a weight, but perhaps sometimes you just have the name, and you ll need to add the weight later. C# methods are flexible enough to handle all of these cases, and in the next chapter, you ll spend time looking at them more closely.
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Question 7-1. What is the difference between a class and an object Question 7-2. What does the keyword private do
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7: Classes and Objects
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Question 7-3. What does the keyword public do Question 7-4. What method is called when you create an object Question 7-5. What is a default constructor Question 7-6. What types can a constructor return Question 7-7. How do you initialize the value of a member variable in a class Question 7-8. What does the keyword this refer to Question 7-9. What is the difference between a static method and an instance method Question 7-10. Where are reference types created Where are value types created
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Exercise 7-1. Write a program with a Math class that has four methods: Add, Subtract, Multiply, and Divide, each of which takes two parameters. Call each method from Main( ) and provide an appropriate output statement to demonstrate that each method works. You don t need to have the user provide input; just provide the two integers to the methods within Main( ). Exercise 7-2. Modify the program from Exercise 7-1 so that you do not have to create an instance of Math to call the four methods. Call the four methods again from Main( ) to demonstrate that they work. Exercise 7-3. Create a class Book that you could use to keep track of book objects. Each Book object should have a title, author, publisher, and ISBN (which should be a string, rather than a numeric type, so that the ISBN can start with a 0 or include an X). The class should have a DisplayBook( ) method to output that information to the console. In Main( ), create three Book objects with this data.
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Programming C# 3.0 C# 3.0 In a Nutshell C# 3.0 Cookbook Jesse Liberty and Donald Xie Joseph Albahari and Ben Albahari Jay Hilyard and Stephen Teilhet O Reilly O Reilly O Reilly 9780596527433 9780596527570 9780596516109
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