(Inheritance ) Write a Java program to meet the following requirements: 1. Desig

Question

(Inheritance ) Write a Java program to meet the following requirements:

1. Design and declaration. All classes’ data fields should be private. (40%)

a. Design a class named Person (5%)

i. Person has a data field: name. Default: name is “unknown”,

ii. Person has a method printInfo() which will print all data fields.

iii. and its two subclasses named Student and Employee.

b. Design a class named Employee which is a subclass of Person. (5%)

i. Employee has a data field: salary. Default: salary is 0,

ii. Employee has a method printInfo()which will print all data fields( including

data fields in super class) (Hint: use super keyword to get info from super class.)

c. Design a class named Faculty which is a subclass of Employee. (10%)

i. Faculty has a data field: dept. Default: dept is “none”,

ii. Faculty has a method printInfo()which will print all data fields( including

data fields in super class)

d. Design a class named Student which is a subclass of Person. (10%)

i. Student has two data fields: age, default 0; email address, default: “none”

ii. Student has a method printInfo()which will print all data fields( including

data fields in super class)

e. Implement necessary constructors, accessor and mutator methods for all the above

classes.(10%)

2. Write a test program to create two Students and two Faculties, assign (NOT read from console) the

following information, and invokes their printInfo methods. xxxx is your Kean ID. (10%)

A Student object name: unknown, age: -1, email: none

A Student object name: “demo_s2”, age: 23, email:

A Faculty object name: “demo_f1”, salary: -1, dept: none

A Faculty object name: “demo_f2”, salary: 10000, dept: “CS”

3. Your program output should look like below: (10%)

Student name: unknown, age: -1, Email: none

Student name: demo_s2, age: 23, Email: xyz.com

Faculty name: demo_f1, salary: -1, dept: none

Faculty name: demo_f2, salary: 10000, dept: CS

Program4 is developed by <your Kean email ID>.

• This project should be coded in ONE java file.

• How to submit:

– Please name the Java Class as XXXX_Program4 and file name as XXXX_Program4.java

where XXXX is your Kean email ID.

– Please submit the program online at http://imc.kean.edu/students/

• Assigned and Due date (by submit timestamp):

– Assigned on 3/22/2017.

– Due 11:59pm on 4/15/2017

• Grading:

– Design, input/output, format: 20%, Functionality (correctness): 20%, requirements: 60%

• Late penalty: 10 points off per week for the first week, additional 20 points off per week after the first

week.

Explanation / Answer

class Person {

  
   private String name;

   public Person() {
       name = "unknown";
   }
  
   public Person(String name) {
       this.name = name;
   }
  
   public String getName() {
       return name;
   }

   public void setName(String name) {
       this.name = name;
   }

   public void printInfo() {
       System.out.println("Person [name=" + name + "]");
   }
}

class Employee extends Person {
  
   private double salary;
  
   public Employee() {
       salary = -1;
   }
  
   public Employee(double salary) {
       this.salary = salary;
   }
  
   public Employee(String name, double salary) {
       super(name);
       this.salary = salary;
   }
  
   public double getSalary() {
       return salary;
   }

   public void setSalary(double salary) {
       this.salary = salary;
   }

   @Override
   public void printInfo() {
       System.out.println("Employee [name = " + getName()+ ", salary = " + salary + "]");
   }
}

class Faculty extends Employee {
  
   private String dept;

   public Faculty() {
       dept = "none";
   }
  
   public Faculty(String dept) {
       this.dept = dept;
   }
  
   public Faculty(String name, double salary, String dept) {
       super(name, salary);
       this.dept = dept;
   }

   public String getDept() {
       return dept;
   }

   public void setDept(String dept) {
       this.dept = dept;
   }

   @Override
   public void printInfo() {
       System.out.println("Faculty [name = " + getName() + ", salary() =" + getSalary() + ", dept =" + dept + "]");
   }
}

class Student extends Person {
  
   private int age;
   private String email;      
  
   public Student() {
       age = -1;
       email = "none";
   }

   public Student(String name, int age, String email) {
       super(name);
       this.age = age;
       this.email = email;
   }

   public int getAge() {
       return age;
   }

   public void setAge(int age) {
       this.age = age;
   }

   public String getEmail() {
       return email;
   }

   public void setEmail(String email) {
       this.email = email;
   }

   @Override
   public void printInfo() {
       System.out.println("Student [name = " + getName() +", age = " + age + ", email = " + email + "]");
   }
}

public class Program4 {
  
   public static void main(String args[]) {
       Student studentOne = new Student();
       Student studentTwo = new Student("demo_s2", 23, "xyz.com");
       Faculty facultyOne = new Faculty();
       Faculty facultyTwo = new Faculty("demo_f2", 10000, "CS");
      
       studentOne.printInfo();
       studentTwo.printInfo();
       facultyOne.printInfo();
       facultyTwo.printInfo();
   }
  
}

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