9.14 ( Employee Hierarchy) In this chapter, you studied an inheritance hierarchy
ID: 3811683 • Letter: 9
Question
9.14 (Employee Hierarchy) In this chapter, you studied an inheritance hierarchy in which class BasePlusCommissionEmployee inherited from class CommissionEmployee. However, not all types of employees are CommissionEmployees. In this exercise, you’ll create a more general Employee superclass that factors out the attributes and behaviors in class CommissionEmployee that are common to all Employees. The common attributes and behaviors for all Employees are firstName, lastName, socialSecurityNumber, getFirstName, getLastName, getSocialSecurityNumber and a portion of method toString. Create a new superclass Employee that contains these instance variables and methods and a constructor. Next, rewrite class CommissionEmployee from Section 9.4.5 as a subclass of Employee. Class CommissionEmployee should contain only the instance variables and methods that are not declared in superclass Employee. Class CommissionEmployee’s constructor should invoke class Employee’s constructor and CommissionEmployee’s toString method should invoke Employee’s toString method. Once you’ve completed these modifications, run the CommissionEmployeeTest and BasePlusCommissionEmployeeTest apps using these new classes to ensure that the apps still display the same results for a CommissionEmployee object and BasePlusCommissionEmployee object, respectively.
public class CommissionEmployee
5 {
6 private final String firstName;
7 private final String lastName;
8 private final String socialSecurityNumber;
9 private double grossSales; // gross weekly sales
10 private double commissionRate; // commission percentage
11
12 // five-argument constructor
13 public CommissionEmployee(String firstName, String lastName,
14 String socialSecurityNumber, double grossSales,
15 double commissionRate)
16 {
17 // implicit call to Object constructor occurs here
18
19 // if grossSales is invalid throw exception
20 if (grossSales < 0.0)
21 throw new IllegalArgumentException(
22 "Gross sales must be >= 0.0");
23
24 // if commissionRate is invalid throw exception
25 if (commissionRate <= 0.0 || commissionRate >= 1.0)
26 throw new IllegalArgumentException(
27 "Commission rate must be > 0.0 and < 1.0");
28
29 this.firstName = firstName;
30 this.lastName = lastName;
31 this.socialSecurityNumber = socialSecurityNumber;
32 this.grossSales = grossSales;
33 this.commissionRate = commissionRate;
34 } // end constructor
35
36 // return first name
37 public String getFirstName()
38 {
39 return firstName;
40 }
41
42 // return last name
43 public String getLastName()
44 {
45 return lastName;
46 }
47
48 // return social security number
49 public String getSocialSecurityNumber()
50 {
51 return socialSecurityNumber;
52 }
53
54 // set gross sales amount
55 public void setGrossSales(double grossSales)
56 {
57 if (grossSales < 0.0)
58 throw new IllegalArgumentException(
59 "Gross sales must be >= 0.0");
60
61 this.grossSales = grossSales;
62 }
63
64 // return gross sales amount
65 public double getGrossSales()
66 {
67 return grossSales;
68 }
69
70 // set commission rate
71 public void setCommissionRate(double commissionRate)
72 {
73 if (commissionRate <= 0.0 || commissionRate >= 1.0)
74 throw new IllegalArgumentException(
75 "Commission rate must be > 0.0 and < 1.0");
76
77 this.commissionRate = commissionRate;
78 }
79
80 // return commission rate
81 public double getCommissionRate()
82 {
83 return commissionRate;
84 }
85
86 // calculate earnings
87 public double earnings()
88 {
89 return getCommissionRate() * getGrossSales();
90 }
91
92 // return String representation of CommissionEmployee object
93 @Override
94 public String toString()
95 {
96 return String.format("%s: %s %s%n%s: %s%n%s: %.2f%n%s: %.2f",
97 "commission employee", getFirstName(), getLastName(),
98 "social security number", getSocialSecurityNumber(),
99 "gross sales", getGrossSales(),
100 "commission rate", getCommissionRate());
101 }
102 } // end class CommissionEmployee
public class BasePlusCommissionEmployee extends CommissionEmployee
7 {
8 private double baseSalary; // base salary per week
9
10 // six-argument constructor
11 public BasePlusCommissionEmployee(String firstName, String lastName,
12 String socialSecurityNumber, double grossSales,
13 double commissionRate, double baseSalary)
14 {
15 super(firstName, lastName, socialSecurityNumber,
16 grossSales, commissionRate);
17
18 // if baseSalary is invalid throw exception
19 if (baseSalary < 0.0)
20 throw new IllegalArgumentException(
21 "Base salary must be >= 0.0");
22
23 this.baseSalary = baseSalary;
24 }
25
26 // set base salary
27 public void setBaseSalary(double baseSalary)
28 {
29 if (baseSalary < 0.0)
30 throw new IllegalArgumentException(
31 "Base salary must be >= 0.0");
32
33 this.baseSalary = baseSalary;
34 }
35
36 // return base salary
37 public double getBaseSalary()
38 {
39 return baseSalary;
40 }
41
42 // calculate earnings
43 @Override
44 public double earnings()
45 {
46 return getBaseSalary() + super.earnings();
47 }
48
49 // return String representation of BasePlusCommissionEmployee
50 @Override
51 public String toString()
52 {
53 return String.format("%s %s%n%s: %.2f", "base-salaried",
54 super.toString(), "base salary", getBaseSalary());
55 }
56 } // end class BasePlusCommissionEmployee
Explanation / Answer
Updated Files
1) Employees.java
public class Employees {
private final String firstName; //first name
private final String lastName; //last name
private final String socialSecurityNumber;//socialSecurityNumber
//Constructor to assign first name, last name, socialSecurityNumber
public Employees(String firstName, String lastName, String socialSecurityNumber) {
this.firstName=firstName;
this.lastName=lastName;
this.socialSecurityNumber=socialSecurityNumber;
}
// return first name
public String getFirstName()
{
return firstName;
}
// return last name
public String getLastName()
{
return lastName;
}
// return social security number
public String getSocialSecurityNumber()
{
return socialSecurityNumber;
}
// return String representation of CommissionEmployee object
@Override
public String toString()
{
return String.format("%s: %s %s%n%s: %s%n%s:",
"commission employee", getFirstName(), getLastName(),
"social security number", getSocialSecurityNumber()
);
}
}// End of the employees class
2. CommissionEmployee.java
public class CommissionEmployee extends Employees{
private double grossSales; // gross weekly sales
private double commissionRate; // commission percentage
// five-argument constructor
public CommissionEmployee(String firstName, String lastName,
String socialSecurityNumber, double grossSales,
double commissionRate)
{
// implicit call to Object constructor occurs here
super(firstName,lastName,socialSecurityNumber);
// if grossSales is invalid throw exception
if (grossSales < 0.0)
throw new IllegalArgumentException(
"Gross sales must be >= 0.0");
// if commissionRate is invalid throw exception
if (commissionRate <= 0.0 || commissionRate >= 1.0)
throw new IllegalArgumentException(
"Commission rate must be > 0.0 and < 1.0");
//commneting the initialization as this is now done in base class Employees
//this.firstName = firstName;
//this.lastName = lastName;
//this.socialSecurityNumber = socialSecurityNumber;
this.grossSales = grossSales;
this.commissionRate = commissionRate;
} // end constructor
// set gross sales amount
public void setGrossSales(double grossSales)
{
if (grossSales < 0.0)
throw new IllegalArgumentException(
"Gross sales must be >= 0.0");
this.grossSales = grossSales;
}
// return gross sales amount
public double getGrossSales()
{
return grossSales;
}
// set commission rate
public void setCommissionRate(double commissionRate)
{
if (commissionRate <= 0.0 || commissionRate >= 1.0)
throw new IllegalArgumentException(
"Commission rate must be > 0.0 and < 1.0");
this.commissionRate = commissionRate;
}
// return commission rate
public double getCommissionRate()
{
return commissionRate;
}
// calculate earnings
public double earnings()
{
return getCommissionRate() * getGrossSales();
}
// return String representation of CommissionEmployee object
@Override
public String toString()
{
return String.format("%s: %s%n%s: %.2f%n%s: %.2f",
"Employee", super.toString(),
"gross sales", getGrossSales(),
"commission rate", getCommissionRate());
}
} // end class CommissionEmployee
3. BasePlusCommissionEmployee.java
public class BasePlusCommissionEmployee extends CommissionEmployee{
private double baseSalary; // base salary per week
// six-argument constructor
public BasePlusCommissionEmployee(String firstName, String lastName,
String socialSecurityNumber, double grossSales,
double commissionRate, double baseSalary)
{
super(firstName, lastName, socialSecurityNumber,
grossSales, commissionRate);
// if baseSalary is invalid throw exception
if (baseSalary < 0.0)
throw new IllegalArgumentException(
"Base salary must be >= 0.0");
this.baseSalary = baseSalary;
}
// set base salary
public void setBaseSalary(double baseSalary)
{
if (baseSalary < 0.0)
throw new IllegalArgumentException(
"Base salary must be >= 0.0");
this.baseSalary = baseSalary;
}
// return base salary
public double getBaseSalary()
{
return baseSalary;
}
// calculate earnings
@Override
public double earnings()
{
return getBaseSalary() + super.earnings();
}
// return String representation of BasePlusCommissionEmployee
@Override
public String toString()
{
return String.format("%s %s%n%s: %.2f", "base-salaried",
super.toString(), "base salary", getBaseSalary());
}
} // end class BasePlusCommissionEmployee
Note: I dont have the test files. Please run through them and check. let me know if you find any issue. God bless you!
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.