O2. Shopping List / O4. Mid Exam Retake

package MidExam.O4;

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

public class O2ShoppingList {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        List<String> test = Arrays.stream(scanner.nextLine().split("!")).
                map(String::toString).collect(Collectors.toList());
        String command = scanner.nextLine();
        while (!command.equals("Go Shopping!")) {
            String type = command.split("\\s+")[0];
            String product1 = command.split("\\s+")[1];
            switch (type) {
                case "Urgent":
                    if (test.contains(product1)) {
                        break;
                    } else {
                        test.add(0, product1);
                    }
                    break;
                case "Unnecessary":
                    for (int i = 0; i < test.size(); i++) {
                        if (test.get(i).equals(product1)) {
                            test.remove(i);
                            i--;
                        }
                    }
                    break;
                case "Correct":
                    String product2 = command.split("\\s+")[2];
                    for (int i = 0; i < test.size(); i++) {
                        if (test.get(i).equals(product1)) {
                            test.set(i, product2);
                        }
                    }
                    break;
                case "Rearrange":
                    if (test.contains(product1)) {
                        test.remove(product1);
                        test.add(product1);
                    }
                    break;
            }
            command = scanner.nextLine();
        }
        for (int i = 0; i < test.size(); i++) {
            if (i == test.size() - 1) {
                System.out.print(test.get(i));
                break;
            }
            System.out.print(test.get(i) + ", ");
        }
    }
}