Shopping List

package Fundamentals.Exams;

import java.util.Arrays;
import java.util.List;
import java.util.Scanner;
import java.util.stream.Collectors;

public class ShoppingList {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);


        List<String> shoppingList = Arrays.stream(scanner.nextLine().split("!")).collect(Collectors.toList());

        String command = scanner.nextLine();

        while (!command.equals("Go Shopping!")) {
            String[] commandArr = command.split("\\s+");

            switch (commandArr[0]) {
                case "Urgent":
                    if (!ifExist(shoppingList, commandArr[1])) {
                        shoppingList.add(0, commandArr[1]);
                    }
                    break;
                case "Unnecessary":
                    if (ifExist(shoppingList, commandArr[1])) {
                        shoppingList.remove(commandArr[1]);
                    }
                    break;
                case "Correct":
                    if (ifExist(shoppingList, commandArr[1])) {
                        int index = shoppingList.lastIndexOf(commandArr[1]);
                        shoppingList.set(index, commandArr[2]);
                    }
                    break;
                case "Rearrange":
                    if (ifExist(shoppingList, commandArr[1])) {
                        shoppingList.remove(commandArr[1]);
                        shoppingList.add(commandArr[1]);
                    }
                    break;
            }



            command = scanner.nextLine();
        }

        System.out.println(String.join(", ", shoppingList));
    }

    private static boolean ifExist(List<String> list, String item) {
        for (int i = 0; i < list.size(); i++) {
            if (list.get(i).equals(item)) {
                return true;
            }
        }
        return false;
    }
}