Dispatching in the object model is executing the correct code based on the type of a class. In
this example, the age method is overloaded in the Student and Employee
classes. Overloading occurs because the same name, age, is used for the methods
in all three classes. There may be a reason for calculating the age of a Student
or an Employee. For example, for insurance reasons, you may want the age of an
Employee as of the first of the month instead of using today's date as might be
defined in the Person class.
The object system dispatches, or executes,
the correct code based on the type. If an object is of type Person, then
that age method is executed. If an object is of type Student, then the age
method defined for the Student class is executed. Likewise, if an object
is of type Employee, then the age method defined for the Employee class is
executed.
The object system ensures that the right method is executed on the
right data. In other words, it is not possible to execute the wrong age
method on the right data, or the right age method on the wrong data.
The ability to redefine methods on a class basis is known a polymorphism.
For this example, you should not see this type of case statement with an
object system. It is handled by dispatching.
if type is Person then
... calculate age based on Person rules ....
else if type is Student then
... calculate age based on Student rules ....
else it type is Employee then
... calculate age based on Employee rules
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