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[book] [en] Pro C# 2008 and the NET 3.5 Platform Fourth Edition

// Error! Forgot to use 'new'!

Car myCar;

C H A P T E R   5  



D E F I N I N G   E N C A P S U L AT E D   C L A S S  T Y P E S



143

8849CH05.qxd  10/22/07  1:34 PM  Page 143




myCar.petName = "Fred";

}

To correctly create a class type variable, you may define and allocate a Car object on a single



line of code:

static void Main(string[] args)

{

Car myCar = new Car();



myCar.petName = "Fred";

}

As an alternative, if you wish to define and allocate an object on separate lines of code, you



may do so as follows:

static void Main(string[] args)

{

Car myCar;



myCar = new Car();

myCar.petName = "Fred";

}

Here, the first code statement simply declares a reference to a yet-to-be-determined Car object.



It is not until you assign a reference to an object via the new keyword that this reference points to a

valid class instance in memory.

In any case, at this point we have a trivial class type that defines a few points of data and some

basic methods. To enhance the functionality of the current Car type, we need to understand the role

of 

class constructors.


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