Question

Create Student class•Change header so that Student extends Person•A Student has-an additional instance variable, major of type String.•Add the instance variable, its getters and setters. •Add a toString method to the Student class. It should reuse the toString method of Person. •Add two constructors: –No args–Constructor that receives the student’s name, birth year and Major as parameters•Create a class TestInheritance3–Create 2 Student objects–Create an Instructor object–Print the information about the two students and the instructor using the getters of Person, Student and Instructor.

Answer 1

Person.java

public class Person {
  
private String name;
private int birthYear;
  
public Person()
{
name = "";
birthYear = 0;
}
  
public Person(String theName, int bYear)
{
name = theName;
birthYear = bYear;
}

public String getName() {
return name;
}

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

public int getBYear() {
return birthYear;
}

public void setYear(int birthYear) {
this.birthYear = birthYear;
}
  
@Override
public String toString()
{
return "Name: " + name + " BYear: " + birthYear;
}
}

Student.java

public class Student extends Person{
  
private String major;
  
public Student()
{
super();
major = "";
}
  
public Student(String name, int birthYear, String major)
{
super(name, birthYear);
this.major = major;
}

public String getMajor() {
return major;
}

public void setMajor(String major) {
this.major = major;
}
  
@Override
public String toString()
{
return (super.toString() + " Major: " + major);
}
}

Instructor.java

public class Instructor extends Person{
  
private String department;
  
public Instructor()
{
super();
department = "";
}
  
public Instructor(String name, int birthYear, String department)
{
super(name, birthYear);
this.department = department;
}

public String getDepartment() {
return department;
}

public void setDepartment(String department) {
this.department = department;
}
  
@Override
public String toString()
{
return (super.toString() + " Department: " + department);
}
}

TestInheritance3.java (Main class)

public class TestInheritance3 {
  
public static void main(String[] args)
{
Scanner sc = new Scanner(System.in);
  
// creating 2 student objects
System.out.print("Student 1 details:\n------------------\nEnter name: ");
String sName1 = sc.nextLine().trim();
System.out.print("Enter birth year: ");
int sBYear1 = sc.nextInt();
sc.nextLine(); // to consueme the next line after taking an integer input
System.out.print("Enter major: ");
String sMajor1 = sc.nextLine().trim();
  
Student s1 = new Student(sName1, sBYear1, sMajor1);
  
System.out.print("\nStudent 2 details:\n------------------\nEnter name: ");
String sName2 = sc.nextLine().trim();
System.out.print("Enter birth year: ");
int sBYear2 = sc.nextInt();
sc.nextLine(); // to consueme the next line after taking an integer input
System.out.print("Enter major: ");
String sMajor2 = sc.nextLine().trim();
  
Student s2 = new Student(sName2, sBYear2, sMajor2);
  
// creating an Instructor object
System.out.print("\nInstructor details:\n------------------\nEnter name: ");
String instName = sc.nextLine().trim();
System.out.print("Enter birth year: ");
int instBYear = sc.nextInt();
sc.nextLine(); // to consueme the next line after taking an integer input
System.out.print("Enter department: ");
String instDept = sc.nextLine().trim();
  
Instructor instructor = new Instructor(instName, instBYear, instDept);
  
System.out.println("\n\nStudents present:\n-----------------\n1. " + s1.toString() + "\n2. " + s2.toString());
System.out.println("\n\nInstructor:\n-----------\n" + instructor.toString());
  
if(instructor.getDepartment().equals(s1.getMajor()))
{
System.out.println("\n" + instructor.getName() + "(Instructor) is of " + s1.getName() + "'s department.");
}
else if(instructor.getDepartment().equals(s2.getMajor()))
{
System.out.println("\n" + instructor.getName() + "(Instructor) is of " + s2.getName() + "'s department.");
}
else
System.out.println("\nNo students of " + instructor.getDepartment() + " department are present!");
}
}

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