Untitled

Here is the detailed Java code

import java.util.Arrays;
import java.util.Scanner;

public class Temp {
    /*
    This is main method from where our code will run
     */
    public static void main(String[] args) {
        // Creating 2 students
        Student s1 = new Student("Sanjay", 1, "Computer Science");
        Student s2 = new Student("Mohit", 2, "Information Technology");

        // Creating 2 PhD Students
        StudentPhD sp1 = new StudentPhD("Shayan", 60, "Computer Science", "Android Developer", "Prof. Dr. Roohie Naaz");
        StudentPhD sp2 = new StudentPhD("Raman", 60, "BCA", "Web Developer", "Prof. Dr. Ranjeet Rawat");

        // Creating the object of College Class
        College NIT_SRINAGAR = new College(5, 5);
        // Adding students to college
        NIT_SRINAGAR.add(s1);
        NIT_SRINAGAR.add(s2);

        // Adding phd students to college
        NIT_SRINAGAR.addPhDStudent(sp1);
        NIT_SRINAGAR.addPhDStudent(sp2);

        // Finding the phd student by their supervisor name
        NIT_SRINAGAR.find("Prof. Dr. Roohie Naaz");

        // printing the college
        System.out.println(NIT_SRINAGAR);

    }
}

class Student {
    // Attributes
    private String name;
    private int id;
    private String level;

    // Creating Constructor with Arguments
    public Student(String name, int id, String level) {
        this.name = name;
        this.id = id;
        this.level = level;
    }

    // Creating method to getId and getLevel
    public int getId() {
        return this.id;
    }

    public String getLevel() {
        return this.level;
    }

    // Creating display method to show the Attributes
    public void display() {
        System.out.println("Name is : " + this.name);
        System.out.println("Id is : " + this.id);
        System.out.println(" Level is : " + this.level);
    }
}

// Creating the StudentPhD class which is inheriting the features from the Student class
class StudentPhD extends Student {
    // Adding the attributes for the phdStudent
    private String specialty;
    private String supervisorName;

    // Creating the constructor for phdStudent
    public StudentPhD(String name, int id, String level, String specialty, String supervisorName) {
        super(name, id, level);
        this.specialty = specialty;
        this.supervisorName = supervisorName;
    }

    // overriding the display method of parent class
    @Override
    public void display() {
        super.display();
        System.out.println("Specialty is : " + this.specialty);
        System.out.println("Supervisor Name is : " + this.supervisorName);
    }

    // method to get supervisor name of the PhD Student

    public String getSupervisorName() {
        return supervisorName;
    }
}

// Creating the College class
class College {
    private int maxStud;
    private int nbStud = 0; // Current number of Students
    private Student[] studs;
    private int maxPhdStud;
    private int nbPhdStud = 0; // Current number of PhD Students
    private StudentPhD[] phdStuds;

    // Creating the constructor for the College class
    public College(int maxStud, int maxPhdStud) {
        this.maxPhdStud = maxPhdStud;
        this.maxStud = maxStud;
        studs = new Student[this.maxStud];
        phdStuds = new StudentPhD[this.maxPhdStud];
    }

    // Creating add method to add the Student in the student array if there is available seat
    // This method returns true if the student is added successfully, false otherwise
    public boolean add(Student student) {
        if (this.nbStud >= this.studs.length) {
            System.out.println("There is no Seat available for the Student");
            return false;
        } else {
            this.studs[nbStud++] = student;
            return true;
        }
    }

    /*
    Since Java doesn't support operator overloading
    I Added a method to add the PhD student
    this method returns true if the PhD student is added successfully, false otherwise

    <Operator Overloading can be easily use in C++ language, and you can relate it with this method, no big deal>
     */
    public boolean addPhDStudent(StudentPhD studentPhD) {
        if (this.nbPhdStud >= this.phdStuds.length) {
            System.out.println("There is no Seat available for the PhD Student");
            return false;
        } else {
            this.phdStuds[nbPhdStud++] = studentPhD;
            return true;
        }
    }

    /* writing the find method to find the PhD Student by their supervisorName
    This method prints that PhD student's data whose supervisor name matches
    else an error message will be displayed
     */

    public void find(String supervisorName) {
        boolean found = false;
        for (StudentPhD studentPhD : phdStuds) {
            if (studentPhD != null && supervisorName.strip().equalsIgnoreCase(studentPhD.getSupervisorName().strip().toLowerCase())) {
                studentPhD.display();
                System.out.println();
                found = true;
            }
        }
        if (!found) {
            System.out.println("No Such Student Found!!\n");
        }
    }

    // This method will execute automatically whenever we print the college using System.out.println(college);
    @Override
    public String toString() {
        return "College{" +
                "maxStud=" + maxStud +
                ", nbStud=" + nbStud +
                ", studs=" + Arrays.toString(studs) +
                ", maxPhdStud=" + maxPhdStud +
                ", nbPhdStud=" + nbPhdStud +
                ", phdStuds=" + Arrays.toString(phdStuds) +
                '}';
    }
}


Output :)

Name is : Shayan
Id is : 60
 Level is : Computer Science
Specialty is : Android Developer
Supervisor Name is : Prof. Dr. Roohie Naaz

College{maxStud=5, nbStud=2, studs=[Student@7cca494b, Student@7ba4f24f, null, null, null], maxPhdStud=5, nbPhdStud=2, phdStuds=[StudentPhD@3b9a45b3, StudentPhD@7699a589, null, null, null]}

Thanks!! :))