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Source Code

The StaticMethods application is located under the Chapter 5 subdirectory.

Defining Static Data

In addition to static members, a type may also define static field data (such as the Random member

variable seen in the previous Teenager class). Understand that when a class defines nonstatic data

(properly referred to as 

instance data), each object of this type maintains an independent copy of

the field. For example, assume a class that models a savings account is defined in a new Console

Application project named StaticData:

// A simple savings account class.

class SavingsAccount

{

public double currBalance;

public SavingsAccount(double balance)

{

currBalance = balance;

}

}

When you create SavingsAccount objects, memory for the currBalance field is allocated for

each class instance. Static data, on the other hand, is allocated once and shared among all objects

of the same type. To illustrate the usefulness of static data, add a static point of data named

currInterestRate to the SavingsAccount class, which is set to a default value of 0.04: