Main.java

package com.company;

public class Main {

    public static void main(String[] args) {

        Person mPerson = new Person("Sayeed","Robin","0134234432","[email protected]");

        mPerson.printName();
        System.out.println(mPerson.getEmailAddress());

        Person nPerson = new Person();
        nPerson.printName();

        Student student = new Student();
       String name = student.getLastName();
        student.printName();
        System.out.println(student.getFirstName());

        Teacher teacher = new Teacher("shojib","arif","21132912","gdfdsfsdf","lecturer","1");
        teacher.printName();
        String des = teacher.getDesignation();
        System.out.println(des);
    }
}

Person.java

package com.company;

public class Person {

    private String firstName;
    private String lastName;
    private String phoneNo;
    private String emailAddress;


    public Person(String firstName, String lastName, String phoneNo, String emailAddress) {
        this.firstName = firstName;
        this.lastName = lastName;
        this.phoneNo = phoneNo;
        this.emailAddress = emailAddress;
    }

    public Person() {

    }

    public String getFirstName() {
        return this.firstName;
    }

    public void setFirstName(String firstName) {
       this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

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

    public String getPhoneNo() {
        return phoneNo;
    }

    public void setPhoneNo(String phoneNo) {
        this.phoneNo = phoneNo;
    }

    public String getEmailAddress() {
        return emailAddress;
    }

    public void setEmailAddress(String emailAddress) {
        this.emailAddress = emailAddress;
    }

    public void printName(){
        System.out.println(firstName+" "+lastName);
    }
}

Student.java

package com.company;

public class Student extends Person {
    private String rollNo;
    private String schoolName;
    private String classLevel;
    private String sectionNo;

    public Student(String firstName, String lastName, String phoneNo, String emailAddress, String rollNo, String schoolName, String classLevel, String sectionNo) {
        super(firstName, lastName, phoneNo, emailAddress);
        this.rollNo = rollNo;
        this.schoolName = schoolName;
        this.classLevel = classLevel;
        this.sectionNo = sectionNo;
    }

    public Student() {
    }

    public String getRollNo() {
        return rollNo;
    }

    public void setRollNo(String rollNo) {
        this.rollNo = rollNo;
    }

    public String getSchoolName() {
        return schoolName;
    }

    public void setSchoolName(String schoolName) {
        this.schoolName = schoolName;
    }

    public String getClassLevel() {
        return classLevel;
    }

    public void setClassLevel(String classLevel) {
        this.classLevel = classLevel;
    }

    public String getSectionNo() {
        return sectionNo;
    }

    public void setSectionNo(String sectionNo) {
        this.sectionNo = sectionNo;
    }

    @Override
    public void printName() {
        System.out.println("Student's name is : "+getFirstName()+" "+getLastName());
    }
}

Teacher.java

package com.company;

public class Teacher extends Person {
    private String designation;
    private String rank;

    public Teacher(String firstName, String lastName, String phoneNo, String emailAddress, String designation, String rank) {
        super(firstName, lastName, phoneNo, emailAddress);
        this.designation = designation;
        this.rank = rank;
    }

    @Override
    public void printName() {
        System.out.println(getFirstName()+" is a teacher");
    }


    public String getDesignation() {
        return designation;
    }
}