added questions

Author: Sarah Akinkunmi

src/chapter9/employee/CommissionEmployee.java

@@ -1,5 +1,20 @@
 package chapter9.employee;
 
+/*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 extends Employee{
     private double grossSales;
     private double commissionRate;

src/chapter9/employee/CommissionEmployeeTest.java

@@ -1,5 +1,20 @@
 package chapter9.employee;
 
+/*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 CommissionEmployeeTest {
         public static void main(String[] args) {
                 CommissionEmployee employee = new CommissionEmployee("Sue", "Jones", "222-22-2222", 10000, .06);

src/chapter9/employee/Employee.java

@@ -1,5 +1,20 @@
 package chapter9.employee;
 
+/*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 Employee {
     private String firstName;
     private String lastName;

src/chapter9/employee/HourlyEmployee.java

@@ -1,5 +1,18 @@
 package chapter9.employee;
 
+/* 9.15 (Creating a New Subclass of Employee) Other types of Employees might include SalariedEmployees who
+get paid a fixed weekly salary, PieceWorkers who get paid by the number of pieces they produce or
+HourlyEmployees who get paid an hourly wage with time-and-a-half—1.5 times the hourly wage—for hours worked
+over 40 hours. Create class HourlyEmployee that inherits from class Employee (Exercise 9.14) and has instance
+variable hours (a double) that represents the hours worked, instance variable wage (a double) that represents
+the wages per hour, a constructor that takes as arguments a first name, a last name, a social security number,
+an hourly wage and the number of hours worked, set and get methods for manipulating the hours and wage, an
+earnings method to calculate an HourlyEmployee’s earnings based on the hours worked and a toString method that
+returns the HourlyEmployee’s String representation. Method setWage should ensure that wage is nonnegative, and
+setHours should ensure that the value of hours is between 0 and 168 (the total number of hours in a week). Use
+class HourlyEmployee in a test program that’s similar to the one in Fig. 9.5.
+ */
+
 public class HourlyEmployee extends Employee{
     private double hours;
     private double wages;

src/chapter9/employee/HourlyEmployeeTest.java

@@ -1,5 +1,18 @@
 package chapter9.employee;
 
+/* 9.15 (Creating a New Subclass of Employee) Other types of Employees might include SalariedEmployees who
+get paid a fixed weekly salary, PieceWorkers who get paid by the number of pieces they produce or
+HourlyEmployees who get paid an hourly wage with time-and-a-half—1.5 times the hourly wage—for hours worked
+over 40 hours. Create class HourlyEmployee that inherits from class Employee (Exercise 9.14) and has instance
+variable hours (a double) that represents the hours worked, instance variable wage (a double) that represents
+the wages per hour, a constructor that takes as arguments a first name, a last name, a social security number,
+an hourly wage and the number of hours worked, set and get methods for manipulating the hours and wage, an
+earnings method to calculate an HourlyEmployee’s earnings based on the hours worked and a toString method that
+returns the HourlyEmployee’s String representation. Method setWage should ensure that wage is nonnegative, and
+setHours should ensure that the value of hours is between 0 and 168 (the total number of hours in a week). Use
+class HourlyEmployee in a test program that’s similar to the one in Fig. 9.5.
+ */
+
 public class HourlyEmployeeTest {
     public static void main(String[] args) {
         HourlyEmployee hourlyEmployee = new HourlyEmployee("Sue", "Jones", "222-22-2222", 100, 60);