Question

Design a class with the following requirements:

1- give the class a name from your choice.

2- write some code that creates three instance variables, choose a name and type for each one of them. (must have two private and one public variables)

3- Initialize the variables using two different constructors.

4- Use mutator and accessor methods (set and get) for the private data members.

5- Display the value of each member variable using a method.

6- In the main, create an object to fill the class data and display the class information.

(in Java language)

Answer 1

Here is your code, save it in Student.java file

import java.io.*;
public class Student
{
    public String name;
    private int roll;
    private int marks;

    Student(String name)
    {
        this.name = name;
    }
    Student(String firstname, String lastname)
    {
        this.name = firstname + ' ' + lastname;
    }
    public void setRoll(int roll)
    {
        this.roll = roll;
    }
    public int getRoll()
    {
        return this.roll;
    }
    public void setMarks(int marks)
    {
        this.marks = marks;
    }
    public int getMarks()
    {
        return this.marks;
    }
    public void printStudentDetails()
    {
        System.out.println("name: " + this.name);
        System.out.println("roll: " + this.getRoll());
        System.out.println("marks: " + this.getMarks());
    }
    public static void main(String[] args)
    {
        Student s1 = new Student("Harsh");
        s1.setRoll(12);
        s1.setMarks(94);
        System.out.println("Details of student 1: ");
        s1.printStudentDetails(); 
        
        Student s2 = new Student("Aryan", "Roy");
        s2.setRoll(21);
        s2.setMarks(49);
        System.out.println("\nDetails of student 2: ");
        s2.printStudentDetails(); 
    }
}

Output: