Clean the Code example for the abstract factory

Hello
I read clean Code and I do not understand something.
On page 38, it is suggested to instead use the switch instructions, we can use the abstract factory.
The example is the following:
Instead:

public Money calculatePay(Employee e)
throws InvalidEmployeeType {
  switch (e.type) {
  case COMMISSIONED:
    return calculateCommissionedPay(e);
  case HOURLY:
    return calculateHourlyPay(e);
  case SALARIED:
    return calculateSalariedPay(e);
  default:
    throw new InvalidEmployeeType(e.type);
  }
}

We can do this:

public abstract class Employee {
  public abstract boolean isPayday();
  public abstract Money calculatePay();
  public abstract void deliverPay(Money pay);
}
-----------------
public interface EmployeeFactory {
  public Employee makeEmployee(EmployeeRecord r) throws InvalidEmployeeType;
}
-----------------
public class EmployeeFactoryImpl implements EmployeeFactory {
  public Employee makeEmployee(EmployeeRecord r) throws InvalidEmployeeType {
    switch (r.type) {
     case COMMISSIONED:
        return new CommissionedEmployee(r) ;
     case HOURLY:
        return new HourlyEmployee(r);
     case SALARIED:
        return new SalariedEmploye(r);
     default:
        throw new InvalidEmployeeType(r.type);
     }
  }
}

I don't see why the plant is necessary here. (I know not much make abstract and I am a beginner)
The abstract class used with his methods wouldn't be enough? Subclasses (CommissionedEmployee, HourlyEmployee,...) are implemented methods that can be called when necessary. Instead of calculatePay (myEmployee), we call myEmployee.calculatePay (). Doesn't it all? So I don't know why the plant is located in this example.

Thanks in advance for any help on this!

lemonboston

lemonboston wrote:
Subclasses (CommissionedEmployee, HourlyEmployee,...) are implemented methods that can be called when necessary. Instead of calculatePay (myEmployee), we call myEmployee.calculatePay (). Doesn't it all?

Well, Yes, that's all. Almost everything is. You're right, you call

myEmployee.calculatePay()

where "myEmployee" is an object of the appropriate subclass. But whence this object? At some point, you must have had a line that says

Employee myEmployee = new SalariedEmployee()

or something along that line. But how did you know to create a SalariedEmployee object and not a HourlyEmployee object? It must have been a few if statements going on there. And here comes the factory: you pass a token representing the employee at the factory (a type code of employee of a character, an employee number that it will search in a database, or something else) and the factory returns a derived object of this token.

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