Question

1. Employees and overriding a class method

The Java program (check below) utilizes a superclass named EmployeePerson (check below) and two derived classes, EmployeeManager (check below) and EmployeeStaff (check below), each of which extends the EmployeePerson class. The main program creates objects of type EmployeeManager and EmployeeStaff and prints those objects.

1. Run the program, which prints manager data only using the EmployeePerson class' printInfo method.
2. Modify the EmployeeStaff class to override the EmployeePerson class' printInfo method and print all the fields from the EmployeeStaff class. Run the program again and verify the output includes the manager and staff information.
3. Modify the EmployeeManager class to override the EmployeePerson class' printInfo method and print all the fields from the EmployeeManager class. Run the program again and verify the manager and staff information is the same.

Sample Input and Output:

Name: Michele, Department: Sales, Birthday: 03-03-1975, Salary: 70000, Staff managed: 25
Name: Bob, Department: Sales, Birthday: 02-02-1980, Salary: 50000, Manager: Michele

-----------------------------------------------------------

Java program:

package Labs.Lab09.Sample;

public class EmployeeMain {

public static void main(String [] args) {

// Create the objects

EmployeeManager manager = new EmployeeManager(25);

EmployeeStaff staff1 = new EmployeeStaff("Michele");

// Load data into the objects using the Person class' method

manager.setData("Michele", "Sales", "03-03-1975", 70000);

staff1.setData ("Bob", "Sales", "02-02-1980", 50000);

// Print the objects

manager.printInfo();

staff1.printInfo();

}

}

EmployeePerson:

package Labs.Lab09.Sample;

public class EmployeePerson {

protected String fullName; // Format: last name, first name

protected String departmentCode;

protected String birthday;

protected int annualSalary;

//

***********************************************************************

// Default constructor. Set protected variables to the empty string or

0

public EmployeePerson() {

fullName = "";

departmentCode = "";

birthday = "";

annualSalary = 0;

}

//

***********************************************************************

// Constructor with parameters to set the private variables

public EmployeePerson(String empFullName, String empDepartmentCode,

String empBirthday, int empAnnualSalary) {

setData(empFullName, empDepartmentCode, empBirthday,

empAnnualSalary);

}

//

***********************************************************************

public void setData(String empFullName, String empDepartmentCode,

String empBirthday, int empAnnualSalary) {

fullName = empFullName;

departmentCode = empDepartmentCode;

birthday = empBirthday;

annualSalary = empAnnualSalary;

}

//

***********************************************************************

public void printInfo() {

System.out.print("Name: " + fullName + ", Department: " +

departmentCode + ", Birthday: " + birthday +

", Salary: " + annualSalary);

}

}

EmployeeManager:

package Labs.Lab09.Sample;

public class EmployeeManager extends EmployeePerson {

private int numManaged; // Number of staff managed

//

***********************************************************************

// Default constructor

public EmployeeManager() {

numManaged = 0;

}

//

***********************************************************************

// Constructor with parameters

public EmployeeManager(int nManaged) {

numManaged = nManaged;

}

//

***********************************************************************

// Get the number of people managed

public int getNumManaged() {

return numManaged;

}

//

***********************************************************************

// FIXME: Override the EmployeePerson class' printInfo method with a

// FIXME: printInfo method to print all manager fields here.

}

EmployeeStaff:

package Labs.Lab09.Sample;

public class EmployeeStaff extends EmployeePerson {

private String managerName;

//

***********************************************************************

// Default constructor

public EmployeeStaff() {

managerName = "";

}

//

***********************************************************************

// Constructor with parameters

public EmployeeStaff(String reportsTo) {

managerName = reportsTo;

}

//

***********************************************************************

// Get the name of the manager

public String getManagerName() {

return managerName;

}

//

***********************************************************************

// FIXME: Override the EmployeePerson class' printInfo method with a

// FIXME: printInfo method to print all staff fields.

@Override

public void printInfo() {

}

}

Thank you.

Answer 1

//########################## EmployeeManager.java ####################

package Labs.Lab09.Sample;

public class EmployeeManager extends EmployeePerson {

   private int numManaged; // Number of staff managed
   //***********************************************************************
   // Default constructor
   public EmployeeManager() {
       numManaged = 0;
   }

   //***********************************************************************
   // Constructor with parameters
   public EmployeeManager(int nManaged) {
       numManaged = nManaged;
   }
   //***********************************************************************
   // Get the number of people managed
   public int getNumManaged() {
       return numManaged;
   }

   //***********************************************************************
   // FIXME: Override the EmployeePerson class' printInfo method with a
   // FIXME: printInfo method to print all manager fields here.
   public void printInfo() {
       super.printInfo();
       System.out.println(", Staff managed: "+numManaged);
   }
}

//############################# EmployeeStaff.java ############################

package Labs.Lab09.Sample;

public class EmployeeStaff extends EmployeePerson {

   private String managerName;
   //***********************************************************************
   // Default constructor

   public EmployeeStaff() {
       managerName = "";
   }

   //***********************************************************************
   // Constructor with parameters
   public EmployeeStaff(String reportsTo) {
       managerName = reportsTo;
   }
   //***********************************************************************
   // Get the name of the manager
   public String getManagerName() {
       return managerName;
   }
   //***********************************************************************
   // FIXME: Override the EmployeePerson class' printInfo method with a
   // FIXME: printInfo method to print all staff fields.

   @Override
   public void printInfo() {
       super.printInfo();
       System.out.println(", Manager: "+managerName);
   }

}

//################################### EmployeePerson.java ########

package Labs.Lab09.Sample;

public class EmployeePerson {

   protected String fullName; // Format: last name, first name
   protected String departmentCode;
   protected String birthday;
   protected int annualSalary;

   //***********************************************************************
   // Default constructor. Set protected variables to the empty string or 0
   public EmployeePerson() {
       fullName = "";
       departmentCode = "";
       birthday = "";
       annualSalary = 0;
   }

   //***********************************************************************
   // Constructor with parameters to set the private variables
   public EmployeePerson(String empFullName, String empDepartmentCode,
           String empBirthday, int empAnnualSalary) {
       setData(empFullName, empDepartmentCode, empBirthday,empAnnualSalary);
   }

   //***********************************************************************
   public void setData(String empFullName, String empDepartmentCode,String empBirthday, int empAnnualSalary) {
       fullName = empFullName;
       departmentCode = empDepartmentCode;
       birthday = empBirthday;
       annualSalary = empAnnualSalary;
   }

   public void printInfo() {
       System.out.print("Name: " + fullName + ", Department: " +departmentCode + ", Birthday: " + birthday +", Salary: " + annualSalary);
   }
}

//############################# EmployeeMain.java ########################

package Labs.Lab09.Sample;

public class EmployeeMain {

   public static void main(String [] args) {
       // Create the objects
       EmployeeManager manager = new EmployeeManager(25);
       EmployeeStaff staff1 = new EmployeeStaff("Michele");

       // Load data into the objects using the Person class' method
       manager.setData("Michele", "Sales", "03-03-1975", 70000);
       staff1.setData ("Bob", "Sales", "02-02-1980", 50000);

       // Print the objects
       manager.printInfo();
       staff1.printInfo();
   }

}

//################################## PGM END ###########################

OUTPUT
########