The first programming project involves writing a program that computes the salaries for a collection of employees of different types. This program consists of four classes. The first class is the
Employee class, which contains the employee’s name and monthly salary, which is specified in whole dollars. It should have three methods:
- A constructor that allows the name and monthly salary to be initialized.
- A method named
annualSalarythat returns the salary for a whole year.
toStringmethod that returns a string containing the name and monthly salary, appropriately labeled.
Employee class has two subclasses. The first is
EmployeeOnCommission. It has two additional instance variables that contains the annual sales in whole dollars for that employee, and the commission rate. It should have the same three methods:
- A constructor that allows the name, monthly salary, commission rate, and annual sales to be initialized.
- An overridden method
annualSalarythat returns the salary for a whole year. The salary for this type of employee consists of the base salary computed from the monthly salary plus a commission. The commission is computed from the commission rate and the annual sales and has a maximum value of $20,000.
- An overridden
toStringmethod that returns a string containing the name, monthly salary, commission rate, and annual sales, appropriately labeled.
The second subclass is
Executive. It has an additional instance variable that reflects the current stock price. It should have the same three methods:
- A constructor that allows the name, monthly salary, and stock price to be initialized.
- An overridden method
annualSalarythat returns the salary for a whole year. The salary for an executive consists of the base salary computed from the monthly salary plus a bonus. The bonus is $30,000 if the current stock price is greater than $50 and nothing otherwise.
- An overridden
toStringmethod that returns a string containing the name, monthly salary and stock price, appropriately labeled.
Finally there should be a fourth class that contains the main method. It should read in employee information from a text file. Each line of the text file will represent the information for one employee for one year. An example of how the text file will look is shown below:
2014 Employee Smith,John 2000 2015 OnCommission Jones,Bill 3000 .02 100000 2014 Executive Bush,George 5000 55
The year is the first data element on the line. The file will contain employee information for only two years: 2014 and 2015. Next is the type of the employee followed by the employee name and the monthly salary. For employees on commission, the final value is their annual sales and for executives the stock price. As the employees are read in,
Employee objects of the appropriate type should be created and they should be stored in one of two arrays depending upon the year. You may assume that the file will contain no more than ten employee records for each year and that the data in the file will be formatted correctly.
Once all the employee data is read in, a report should be displayed on the console for each of the two years. Each line of the report should contain all original data supplied for each employee together with that employee’s annual salary for the year. For each of the two years, an average of all salaries for all employees for that year should be computed and displayed.
Be sure to follow good programming style, which means making all instance variables
private or protected when private is too restrictive, naming all constants and avoiding the duplication of code. Furthermore you must select enough different kinds of employees to completely test the program.
25%: requirements (5% for the completion of each class, 5% for the reading of the data from a file, 5% for printing the results correctly)
20%: test data and test documentation. Have 2 different examples of input files. Describe the expected output for each file in a document, and explain how you computed this expected output, independently of your program; just running your program and pasting the results does not count!
30%: code structure (use of proper Java constructs, no code repetition, variables as local as possible)
25%: code presentation. Fully spelled and meaningful names (variables, classes, functions), header comment with your full name and the assignment name, no useless comments (in particular the automatically generated comments), no useless imports, proper code indentation.
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