Question

use eclipse

Develop the classes for the following requirements:

1. A class named Employee (general, for college)

2. A class named Instructor (more specific, for college)

3. A class named Staff (more specific, for college, HR officer, Marking staff)

Tasks:

1. Figure out the relationships among the classes;

2. Determine the abstract class, and the child classes;

3. For the abstract class, determine at least one abstract method;

4. Each class should at least two data members and one extra method;

5. Full implementation of all constructors, getters/setters and toString, and other methods;

6. Test your Java code and take screen shots

Answer 1

Here are the relationship details:

Employee Class will be abstract class with following members and abstract methods:

package university;

public abstract class Employee {
        
        int employeeId;
        String firstName;
        String lastName;
        int age;
        
        abstract String getFirstName();
        abstract String getLastName();
        abstract int getEmployeeId();
        abstract int getAge();
        abstract void setEmployeeId(int employeeId);
        abstract void setFirstName(String firstName) ;
        abstract void setLastName(String lastName) ;
        abstract  void setAge(int age);
}

Staff Class will extend Employee Class and have following members and methods:

package university;

public class Staff extends Employee{


        int staffId;
        String staffType;
        String department;
        
        

        public Staff(){}
        
        public Staff(int employeeId,
                        String firstName,
                        String lastName,
                        int age,String departmen, int staffId,String staffType){
                this.employeeId=employeeId;
                this.firstName=firstName;
                this.lastName=lastName;
                this.age=age;
                this.department=departmen;
                this.staffId=staffId;
                this.staffType=staffType;
        
        }


        @Override
        String getFirstName() {
                return firstName;
        }

        @Override
        String getLastName() {
                return lastName;
        }

        @Override
        int getEmployeeId() {
                return employeeId;
        }

        @Override
        int getAge() {
                return age;
        }

        @Override
        void setEmployeeId(int employeeId) {
                this.employeeId=employeeId;

        }

        @Override
        void setFirstName(String firstName) {
                this.firstName=firstName;

        }

        @Override
        void setLastName(String lastName) {
                this.lastName=lastName;         
        }

        @Override
        void setAge(int age) {
                this.age=age;
        }
        
        public int getStaffId() {
                return staffId;
        }

        public void setStaffId(int staffId) {
                this.staffId = staffId;
        }

        public String getStaffType() {
                return staffType;
        }

        public void setStaffType(String staffType) {
                this.staffType = staffType;
        }

        public String getDepartment() {
                return department;
        }

        public void setDepartment(String department) {
                this.department = department;
        }
        @Override
        public String toString(){
                return "Staff Details:"
                                + "\nFirst Name:"+firstName+
                                "\nLast Name:"+lastName+
                                "\nAge:"+age+
                                "\nEmployee ID:"+employeeId+
                                "\nStaff ID:"+staffId+
                                "\nStaff Type:"+staffType+
                                "\nDepartment:"+department;
        }
        
}

Instructor class will extent Employee Class and have following members and methods:

package university;

public class Instructor extends Employee{


        //To which department does instructor belongs
        String department;
        //Instructor Id(different from employee id)

        int instructorId;
        
        String instrcutorType;

        

        public Instructor(){

        }

        public Instructor(int employeeId,
                        String firstName,
                        String lastName,
                        int age,String departmen, int instructorId){
                this.employeeId=employeeId;
                this.firstName=firstName;
                this.lastName=lastName;
                this.age=age;
                this.department=departmen;
                this.instructorId=instructorId;

        }


        public String getDepartment() {
                return department;
        }


        public void setDepartment(String department) {
                this.department = department;
        }


        public int getIntstructorId() {
                return instructorId;
        }


        public void setIntstructorId(int instructorId) {
                this.instructorId = instructorId;
        }


        @Override
        String getFirstName() {
                return firstName;
        }

        @Override
        String getLastName() {
                return lastName;
        }

        @Override
        int getEmployeeId() {
                return employeeId;
        }

        @Override
        int getAge() {
                return age;
        }

        @Override
        void setEmployeeId(int employeeId) {
                this.employeeId=employeeId;

        }

        @Override
        void setFirstName(String firstName) {
                this.firstName=firstName;

        }

        @Override
        void setLastName(String lastName) {
                this.lastName=lastName;         
        }

        @Override
        void setAge(int age) {
                this.age=age;
        }
        
        public int getInstructorId() {
                return instructorId;
        }

        public void setInstructorId(int instructorId) {
                this.instructorId = instructorId;
        }

        public String getInstrcutorType() {
                return instrcutorType;
        }

        public void setInstrcutorType(String instrcutorType) {
                this.instrcutorType = instrcutorType;
        }

        @Override
        public String toString(){
                return "Instructor Details:\n"
                                + "First Name:"+firstName+
                                "\nLast Name:"+lastName+
                                "\nAge:"+age+
                                "\nEmployee ID:"+employeeId+
                                "\nInstructor ID:"+instructorId+
                                "\nDepartment:"+department+
                                "\nInstructor Type:"+instrcutorType;
        }
}

MainClass to test the code:

package university;

public class MainClass {

        public static void main(String[] args) {
                
                Staff staff=new Staff();
                Staff staff2=new Staff();
                Instructor instructor=new Instructor();
                Instructor instructor2=new Instructor();
                
                staff.setFirstName("John");
                staff.setLastName("Carpenter");
                staff.setAge(30);
                staff.setEmployeeId(123);
                staff.setStaffId(001);
                staff.setDepartment("HR");
                staff.setStaffType("HR officer");
                
                staff2.setFirstName("William");
                staff2.setLastName("Doffe");
                staff2.setAge(35);
                staff2.setEmployeeId(124);
                staff2.setStaffId(002);
                staff2.setDepartment("Marketing");
                staff2.setStaffType(" Marking staff");
                
                instructor.setFirstName("John");
                instructor.setLastName("Carpenter");
                instructor.setAge(30);
                instructor.setEmployeeId(125);
                instructor.setInstructorId(011);
                instructor.setDepartment("Physics");
                instructor.setInstrcutorType("Physics Lecturer");
                
                instructor2.setFirstName("Steve");
                instructor2.setLastName("Smith");
                instructor2.setAge(30);
                instructor2.setEmployeeId(126);
                instructor2.setInstructorId(012);
                instructor2.setDepartment("Physics");
                instructor2.setInstrcutorType("Physics Lab Instructor");
                
                System.out.println(staff.toString());
                System.out.println("\n");
                System.out.println(staff2.toString());
                System.out.println("\n");
                System.out.println(instructor.toString());
                System.out.println("\n");
                System.out.println(instructor2.toString());
                
        }

}

Output:

Staff Details:
First Name:John
Last Name:Carpenter
Age:30
Employee ID:123
Staff ID:1
Staff Type:HR officer
Department:HR


Staff Details:
First Name:William
Last Name:Doffe
Age:35
Employee ID:124
Staff ID:2
Staff Type: Marking staff
Department:Marketing


Instructor Details:
First Name:John
Last Name:Carpenter
Age:30
Employee ID:125
Instructor ID:9
Department:Physics
Instructor Type:Physics Lecturer


Instructor Details:
First Name:Steve
Last Name:Smith
Age:30
Employee ID:126
Instructor ID:10
Department:Physics
Instructor Type:Physics Lab Instructor

Screenshot of output: