Main.java

package com.company;

import java.util.*;
import java.awt.*;
import java.util.Scanner;

class OOP {
    public interface Department{
        public void getDetpName();
        public void getDetpHead();
    }

    public static class Hostel{
        protected String hname,hlocation;
        int noofroom;
        void getHostelName(){
            System.out.println("Name Of the Hostel : " + hname);
        }
        void getHostelLocation(){
            System.out.println("Hostel Location : " + hlocation);
        }
        void getNoOfRoom(){
            System.out.println("Total Room : " + noofroom);
        }
    }


    static class Student extends Hostel implements Department
    {
        String sname,regno,elesub;
        String deptName,deptHead;
        int avgMarks;
        void getStudentName(){
            System.out.println("Student : " + sname);
        }
        String getStudentRegNo(){
            return regno;
        }
        void getElectiveSubject(){
            System.out.println("Elective Subject : " + elesub);
        }
        void getAvgMarks(){
            System.out.println("Average Marks : " + avgMarks);
        }
        public void getDetpName(){
            System.out.println("Department Name : " + deptName);
        }
        public void getDetpHead(){
            System.out.println("Department Head : " + deptHead);
        }
        void addStudent(){
            Scanner sc=new Scanner(System.in);
            System.out.print("Enter Student name : ");
            sname=sc.nextLine();
            System.out.print("Enter Registration Number : ");
            regno=sc.nextLine();
            System.out.print("Enter Elective Subject : ");
            elesub=sc.nextLine();
            System.out.print("Enter Hostel Name : ");
            hname=sc.nextLine();
            System.out.print("Enter Hostel Location : ");
            hlocation=sc.nextLine();
            System.out.print("Enter Department Name : ");
            deptName=sc.nextLine();
            System.out.print("Enter Department Head : ");
            deptHead=sc.nextLine();
            System.out.print("Enter No of room : ");
            noofroom=sc.nextInt();
            System.out.print("Enter Avg Marks : ");
            avgMarks=sc.nextInt();
        }
        void migrate(){
            Scanner sc=new Scanner(System.in);
            System.out.print("Enter new Department Name : ");
            deptName=sc.nextLine();
            System.out.print("Enter new Department Head : ");
            deptHead=sc.nextLine();
        }
        void display(){
            getStudentName();
            System.out.println(" Student Registration No is : " + getStudentRegNo());
            getElectiveSubject();
            getAvgMarks();
            getDetpName();
            getDetpHead();
        }
    }

    class StudentMaster{
        public static void main(String []args){
            Scanner sc=new Scanner(System.in);
            Student []st=new Student[100];
            int sno=0;
            String rno;
            int ch;
            boolean b;
            while(true){
                System.out.println("\n 1. Admit a student");
                System.out.println(" 2. Migrate a student");
                System.out.println(" 3. Display");
                System.out.println(" 4. Exit");
                System.out.println(" 5. Enter Your Choice");
                ch=sc.nextInt();
                switch(ch){
                    case 1:
                        st[sno]= new Student();
                        st[sno++].addStudent();
                        break;
                    case 2:
                        System.out.println("Enter Registration no : ");
                        rno=sc.next();
                        b=false;
                        for(int i=0;i<sno;i++){
                            if(st[i].getStudentRegNo().equals(rno)){
                                b=true;
                                st[0].migrate();
                                break;
                            }
                        }
                        if(b==false)
                        {
                            System.out.println("Student Not Found");
                        }
                        break;
                    case 3:
                        System.out.println("Enter Registration no : ");
                        rno=sc.next();
                        b=false;
                        for(int i=0;i<sno;i++){
                            if(st[i].getStudentRegNo().equals(rno)){
                                b=true;
                                st[0].display();
                                break;
                            }
                        }
                        if(b==false){
                            System.out.println("Student Not Found");
                        }
                        break;
                    case 4:
                        System.exit(0);
                    default:
                        System.out.println("--Invalid Entry--");
                }
            }
        }
    }

}