code

import java.util.*;
public class Main{

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		ArrayList<String> arr = new ArrayList<String>();
		ArrayList<Integer> arrr = new ArrayList<Integer>();
		int z=1;
		while(z==1) {
		System.out.println("Enter your choice: ");
		System.out.println("1. Register");
		System.out.println("2. details");
		System.out.println("3.Exit");
		int n = sc.nextInt();
		switch(n) {
		case 1:
			register(arr, arrr);
			break;
		case 2:
			details(arr, arrr);
			break;
		case 3:
			z=0;
		}
		}
		System.out.println(arr+" "+arrr);
	}
	static void register(ArrayList ar, ArrayList I) {
		Scanner s = new Scanner(System.in);
		System.out.println("Enter your name: ");
		String name = s.nextLine();
		ar.add(name);
		System.out.println("Enter your Country: ");
		String coun = s.nextLine();
		ar.add(coun);
		System.out.println("Enter your emailId: ");
		String email = s.nextLine();
		ar.add(email);
		System.out.println("Create your password: ");
		String pass = s.nextLine();
		ar.add(pass);
		System.out.println("registered successfully...");
		System.out.println("1.Login");
		System.out.println("2.Exit");
		int n = s.nextInt();
		switch(n) {
		case 1:
			login(ar, I);
			break;
		case 2:
			break;
		default:
			System.out.println("Invalid Input");
		}
	}
	static void login(ArrayList ar, ArrayList I) {
		Scanner sc = new Scanner(System.in);
		System.out.println("Enter your emailId: ");
		String email = sc.nextLine();
		if(ar.contains(email)) {
			System.out.println("Enter your password: ");
			String pass = sc.nextLine();
			if(ar.contains(pass)) {
				System.out.println("Login successfull");
				System.out.println("Enter your choice: ");
				System.out.println("1.details");
				System.out.println("2.Exit");
				int n = sc.nextInt();
				switch(n) {
				case 1:
					details(ar, I);
					break;
				case 2:
					break;
				default:
					break;
				}
			}
			else {
				System.out.println("Invalid password");
			}
		}
		else {
			System.out.println("Invalid email");
		}
	}
	
	static void details(ArrayList ar, ArrayList I) {
		Scanner sc = new Scanner(System.in);
		System.out.println("Enter your email: ");
		String email = sc.nextLine();
		if(ar.contains(email)) {
			System.out.println("Enter your 10th class marks: ");
			int t = sc.nextInt();
			I.add(t);
			System.out.println("Enter your 12th class marks: ");
			int t2 = sc.nextInt();
			I.add(t2);
			System.out.println("Enter your Graduation percentage: ");
			int g = sc.nextInt();
			I.add(g);
			System.out.println("Expecting package(in lakhs): ");
			int m = sc.nextInt();
			I.add(m);
		}
		else {
			System.out.println("Invalid email");
		}
	}
	
}