oops

import java.util.*;
class Details{
    int rollnumber, fee, yearOfStudy;
    long aadharnumber;
    String name, DOB, gender, address;

    public Details(int id, String name, String gender, Long aadharnumber, String DOB, int fee, int yearOfStudy, String address){
        this.rollnumber = rollnumber;
        this.name = name;
        this.gender = gender;
        this.aadharnumber = aadharnumber;
        this.DOB = DOB;
        this.fee = fee;
        this.yearOfStudy = yearOfStudy;
        this.address = address;
    }
}


class Sdnt{
    public static void main(String[] args) {
        Scanner sc = new Scanner (System.in);
        ArrayList <Details> sdnt = new ArrayList<Details>();
        int rollnumber, fee, yearOfStudy,s_rn,count = 0,co;
        long aadharnumber;
        String name, DOB, gender, address;
        boolean f = true;
        
        System.out.println("Menu");

        System.out.println("1. Add Student Details\n2. View Single Student Details\n3. View All Student Details\n4. Update Student Details\n5. Delete Student Details\n6. exit");

        while(f){
            System.out.print("Enter your choice : ");
            int n = sc.nextInt();
            boolean flag = false;
            switch(n){
                case 1 :
                    System.out.println("Enter the details\n");
                    System.out.print("Enter Rollnumber : ");
                    rollnumber = sc.nextInt();

                    System.out.print("Enter Name : ");
                    name = sc.next();

                    System.out.print("Enter Gender (M/F/O) : ");
                    gender = sc.next();

                    System.out.print("Enter Aadhar number : ");
                    aadharnumber = sc.nextLong();

                    System.out.print("Enter DOB(DD/MM/YYYY) : ");
                    DOB = sc.next();

                    System.out.print("Enter Fees : ");
                    fee = sc.nextInt();

                    System.out.print("Enter the Year Of Study : ");
                    yearOfStudy = sc.nextInt();

                    System.out.print("Enter the address : ");
                    address = sc.next();

                    sdnt.add(new Details(rollnumber, name, gender, aadharnumber, DOB, fee, yearOfStudy, address));

                    count++;
                    System.out.println("Student Details added sucessfully !");
                    break;

                case 2 :
                    
                    System.out.print("Enter the Roll number : ");
                    s_rn = sc.nextInt();
                    System.out.println("____________");
                    System.out.println("|ROLLNUMBER\t|NAME\t|GENDER\t|AADHAR NUMBER\t|DOB\t\t|FEE\t|STUDY\t|ADDRESS\t|");
                    System.out.println("____________");
                    for(Details d : sdnt){
                        if(s_rn == d.rollnumber){
                            System.out.println("|"+d.rollnumber+"\t|"+d.name+"\t|"+d.gender+"\t|"+d.aadharnumber+"\t|"+d.DOB+"\t|"+d.fee+"\t|"+d.yearOfStudy+"\t\t|"+d.address+"\t\t|");
                            System.out.println("____________");
                            flag = true;
                            break;
                        }
                    }
                    if(!flag){
                        System.out.println("Incorrect ROLL NUMBER, PLEASE ENTER CORRECT ROLL NUMBER ");
                    }
                    break;

                case 3 :
                    System.out.println("The List of the students are : ");
                    System.out.println("____________");
                    System.out.println("|ROLLNUMBER\t|NAME\t|GENDER\t|AADHAR NUMBER\t|DOB\t\t|FEE\t|STUDY\t|ADDRESS\t|");
                    System.out.println("____________");
                    for(Details d : sdnt){
                        System.out.println("|"+d.rollnumber+
							"\t|"+d.name+
							 "\t|"+d.gender+
							 "\t|"+d.aadharnumber+
							 "\t|"+d.DOB+
							 "\t|"+d.fee+	
							 "\t|"+d.yearOfStudy+
							 "\t\t|"+d.address+"\t\t|");
                        System.out.println("____________");
                    }
                    break;

                case 4 :
                    System.out.println("Enter the Student Roll number : ");
                    s_rn = sc.nextInt();

                    for(Details d : sdnt){
                        if(s_rn == d.rollnumber){
                            System.out.println("Menu");
                            System.out.println("1.Name\n2.Gender\n3.Aadhar Number\n4.DOB\n5.Fee\n6.Years Of Study\7.Address");
                            System.out.print("Enter the option that you want to edit : ");
                            int opt = sc.nextInt();
                            String a;
                            int b;
                            long c;
                            switch(opt){
                                case 1:
                                    System.out.print("Enter the updated name : ");
                                    a = sc.next();
                                    d.name = a;
                                    break;
                                case 2:
                                    System.out.print("Enter the updated Gender : ");
                                    a = sc.next();
                                    d.gender = a;
                                    break;
                                case 3:
                                    System.out.print("Enter the updated Aadhar number : ");
                                    c = sc.nextLong();
                                    d.aadharnumber = c;
                                    break;
                                case 4:
                                    System.out.print("Enter the updated DOB : ");
                                    a = sc.next();
                                    d.DOB = a;
                                    break;
                                case 5:
                                    System.out.print("Enter the updated Fee : ");
                                    b = sc.nextInt();
                                    d.fee = b;
                                    break;
                                case 6:
                                    System.out.print("Enter the updated Years of Study : ");
                                    b = sc.nextInt();
                                    d.yearOfStudy = b;
                                    break;
                                case 7:
                                    System.out.print("Enter the updated Address : ");
                                    a = sc.next();
                                    d.address = a;
                                    break;
                            }
                            flag = true;
                            break;
                        }
                        
                    }
                    if(!flag){
                        System.out.println("Incorrect Roll number, PLEASE ENTER CORRECT ROLL NUMBER ");
                    }
                    break;

                case 5 :
                    System.out.print("Enter the Student roll number to be deleted : ");
                    s_rn = sc.nextInt();
                    co = 0;
                    for(Details d : sdnt){
                        if(s_rn == d.rollnumber ){
                            sdnt.remove(d);
                            count--;
                            flag = true;
                            break;
                        }
                    }
                    if(!flag){
                        System.out.println("Incorrect Roll number, PLEASE ENTER CORRECT ROLL NUMBER ");
                    }else{
                        System.out.println("Student Details deleted successfully");
                    }
                    break;

                case 6 :
                    f = false;
                    break;
                default:
                    System.out.println("Enter the correct option from the menu");
            }
        }
    }
}