Question

What is the purpose of extending a class due to inheritance? Provide an example of extending a class due to inheritance. Provide the code, and explain the processes.

Simple Java Programming.

Answer 1

Purposes of Inheritance:

1. Code reusability (being able to use the code again)

2. Code structuring (packing right set of data and methods that resembles the real-life objects)

Sample Program

public class Main   //Main class 
{
        public static void main(String[] args) //main method
        {
        Student student = new Student("Leonardo diCaprio", 21); //student object
        Teacher teacher = new Teacher("Angelina Jolie", "B.Tech");  //teacher object
        System.out.println("Student is "+student.name+" and teacher is "+teacher.name); //printing student and teacher names
        }
}
class Person //person class
{
    String name;    //every person definitely has a name
    Person(String name) //constructor for Person class
    {
        this.name = name;
    }
}
class Student extends Person    //Student class inheriting Person class because every student is a person and so student inherits all data and methods of person
{
    int rollno; //extra data for a student is rollno
    Student(String name, int rollno)    //constructor for Student class
    {
        super(name);    //reusability of Person constructor and name data of Person class (main reason for inheritance)
        this.rollno = rollno;
    }
}
class Teacher extends Person    //Teacher class inheriting Person class because every teacher is a person and so teacher inherits all data and methods of person
{
    String qualification;   //extra data for a teacher is qualification
    Teacher(String name, String qualification)  //reusability of Person constructor and name data of Person class (main reason for inheritance)
    {
        super(name);
        this.qualification = qualification;
    }
}

Sample program Screenshot

Output Screenshot

Each and everything is explained clearly in the comment section of the code.

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