semester 2 project - programming

package semester_2_project;

import java.util.ArrayList;
import java.util.Scanner;

/*
Group names:
Daryan Latif Ali
Hedy Soran Osman
Hawre Zyad Muhammad
*/

public class Semester_2_project {

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        ArrayList<String> cars = new ArrayList<String>();
        ArrayList<Integer> prices = new ArrayList<Integer>();
        ArrayList<Boolean> state = new ArrayList<Boolean>();
        String car_input;
        int price_input;
        boolean state_input;
        int num_input;
        int index_value;
        System.out.println("Welcome to car dealership management:\n"
                + "type (1) to add a car, type (2) to update a car,"
                + " type (3) to remove a car from the list,"
                + " type (4) to show all the cars or"
                + " type (0) to exit.");
        try {
            int in = input.nextInt();
            while (in != 0) {
                switch (in) {
                    case 1:
                        System.out.print("Enter car name: ");
                        car_input = input.next(); // bmw
                        System.out.print("Enter " + car_input + "\'s price: ");
                        price_input = input.nextInt(); // 1000
                        System.out.print("Is this a used car? [true/false]: ");
                        state_input = input.nextBoolean(); // true
                        cars.add(car_input); // 0 = bmw
                        prices.add(price_input); // 0 = 1000
                        state.add(state_input); // 0 = true
                        System.out.printf("Successfully added %s to your list for %d [Car used: %s]\n", car_input, price_input, state_input);
                        break;
                    case 2:
                        if (cars.size() > 0) {
                            System.out.println("Which car would you like to update? (Enter index number)");
                            for (int i = 0; i < cars.size(); i++) {
                                System.out.printf("index %d: %s\n", i, cars.get(i));
                            }
                            index_value = input.nextInt();
                            System.out.printf("What would you like to update for %s? [1: name, 2: price, 3: state]\n", cars.get(index_value));
                            num_input = input.nextInt();
                            if (num_input == 1) {
                                String old_name = cars.get(index_value);
                                System.out.printf("Update name for %s\n", old_name);
                                car_input = input.next();
                                cars.set(index_value, car_input);
                                System.out.printf("Successfully updated name from %s to %s\n", old_name, cars.get(index_value));
                            } else if (num_input == 2) {
                                int old_price = prices.get(index_value);
                                System.out.printf("Update price for %s (currently %d)\n", cars.get(index_value), old_price);
                                price_input = input.nextInt();
                                prices.set(index_value, price_input);
                                System.out.printf("Successfully updated name from %s to %s\n", old_price, prices.get(index_value));
                            } else if (num_input == 3) {
                                boolean old_state = state.get(index_value);
                                System.out.printf("Update state for %s [true/false]\n", cars.get(index_value));
                                state_input = input.nextBoolean();
                                state.set(index_value, state_input);
                                System.out.printf("Successfully updated name from %s to %s\n", old_state, state.get(index_value));
                            } else {
                                System.out.println("Invalid option");
                            }
                        } else {
                            System.out.println("Your list is empty");
                        }
                        break;
                    case 3:
                        if (cars.size() > 0) {
                            System.out.println("Which car would you like to remove? (enter index number)");
                            for (int i = 0; i < cars.size(); i++) {
                                System.out.printf("index %d: %s\n", i, cars.get(i));
                            }
                            index_value = input.nextInt();
                            String old_name = cars.get(index_value);
                            cars.remove(index_value);
                            prices.remove(index_value);
                            state.remove(index_value);
                            System.out.printf("Successfully removed %s\n", old_name);
                        } else {
                            System.out.println("Your list is empty");
                        }
                        break;
                    case 4:
                        if (cars.size() > 0) {
                            System.out.println("NO.\t\tName\t\tPrice\t\tUsed car");
                            for (int i = 0; i < cars.size(); i++) {
                                int car_id = i + 1;
                                System.out.println(car_id + "\t\t" + cars.get(i) + "\t\t" + prices.get(i) + "\t\t" + state.get(i));
                            }
                        } else {
                            System.out.println("Your list is empty.");
                        }
                        break;
                    default:
                        System.out.println("Invalid option, try again.");
                        break;
                }
                System.out.println("********************************************");
                System.out.println("type (1) to add a car, type (2) to update a car, type (3) to remove a car from the list, type (4) to show all the cars or type (0) to exit.");
                in = input.nextInt();
            }
        } catch (Exception e) {
            System.out.println(e);
        }
    }

}