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inexpensive web hosting affiliate program duration » 252 Here we've used attribute methods to create a virtual instance variable. To the outside world, durationInMinutes seems to be an attribute like any other. Internally, though, there is no corresponding instance variable. This is more than a curiosity. In his landmark book Object-Oriented Software Construction , Bertrand Meyer calls this the Uniform Access Principle.
inexpensive web hosting affiliate program By hiding the difference between instance variables and calculated values, you are shielding the rest of the world from the implementation of your class. You're free to change how things work in the future without impacting the millions of lines of code that use your class. This is a big win.Class Variables and Class Methods So far, all the classes we've created have contained instance variables and instance methods: variables that are associated with a particular instance of the class, and methods that work on those variables. Sometimes classes themselves need to have their own states.
inexpensive web hosting affiliate program This is where class variables come in. Class Variables A class variable is shared among all objects of a class, and it is also accessible to the class methods that we'll describe later. There is only one copy of a particular class variable for a given class. Class variable names start with two ``at'' signs, such as ``@@count''. Unlike global and instance variables, class variables must be initialized before they are used.
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