4.5. Instance Variables and Properties
In Chapter 3, we declared all of an app’s variables in the
Main method. Variables declared in the body of a method are known as local variables and can be used only in that method. When a method terminates, the values of its local variables are lost. Recall from Section 4.2 that an object has attributes that are carried with it as it’s used in an app. Such attributes exist before a method is called on an object and after the method completes execution.
Attributes are represented as variables in a class declaration. Such variables are called fields and are declared inside a class declaration but outside the bodies of the class’s method declarations. When each object of a class maintains its own copy of an ...