Employee in Java

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Figure 36 The initial hierarchy for the personnel system
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Figure 37 The hierarchy from Figure 36 modified to show members of staff who drive company cars
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Now let us assume a further complication: that some monthly staff are allowed to drive company cars Personnel systems often have information about the car that a current member of staff drives This information is used for a wide variety of purposes, from finding out who has misparked the car in the company car park to determining whether a new car is needed for a member of staff Given this further complication we need another class which will contain instance variables connected with the car an employee runs, for example the make of the car and the date when the car was assigned to the member of staff The hierarchy showing this new situation is given in Figure 37 The new class will inherit from MonthEmployee since only monthly employees are allowed to drive company cars Let us examine a further complication: the company employs sales staff whose job is to sell the items that the company manufactures These sales staff are monthly employees and need a company car since they travel long distances visiting customers premises They differ from other monthly employees in that their pay is made up of two elements: a basic monthly pay and a commission based on the amount of sales they make in their current pay month The company wishes to keep data on sales in their staff s payment record; typically this data will include the monetary value of the current month s sales and the sales that have been made this year to date This means that a new class would need to be developed Figure 38 shows one attempt at including this new class, called SalesEmployee, in the hierarchy This is not the correct version of the hierarchy since it ignores the fact that a SalesEmployee is allowed to drive a car The position of SalesEmployee in the hierarchy means that it will not inherit all the facilities available for processing car data that are available in the class CarMonthEmployee The correct version of the hierarchy is shown in Figure 39
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Figure 38 A new hierarchy showing sales staff
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SalesEmployee
Figure 39 The correct version of the inheritance hierarchy showing the correct position of SalesEmployee
Again with this hierarchy you can see that as we proceed downwards the classes become more specific and hence less generally useful: at the top of the hierarchy is a class which contains common information that almost every personnel system could use, at the second level are classes which only companies that employ both weekly and monthly staff could use, at the third level is a class which only companies that provide company cars could use and at the bottom of the hierarchy is a class which only companies that have a sales force could use As you proceed down the hierarchy more and more methods and instance variables will be included in classes For example, the class CarMonthEmployee shown in Figure 39 would probably contain an instance variable which provides details of the type of car that the member of staff described by this class is currently driving and would also contain an instance variable which details the date on which this employee was given this car so that the company can replace it within a specified time period This class would also contain methods which access, update and use these instance variables, for example a method carType which returns the type of the car that is currently driven by an object described by this class The class SalesEmployee, further down the hierarchy, might contain an instance variable which details the current sales for the month for a sales person and the current sales for the year for the same sales person There would also be methods associated with these instance variables, for example methods which add a new sale to these variables and which retrieve the values stored in them