int d; // elapsed time in days

int elapsedTimeInDays;
int daysSinceCreation;
int daysSinceModification;
int fileAgeInDays;

PhoneNumber phoneString;

public class Part {
private String mDesc;
{

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

isPayday(Employee e, Date date)``` و یا
```deliverPay(Employee e, Money pay)

public abstract public abstract public abstract
boolean isPayday();
Money calculatePay();
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);
} }
}

public boolean set(String attribute, String value);

}