Problem 2 - Friend List Maintenance

package PodgotovkaZaIzpit;


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

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


        String[] friends = scanner.nextLine().split(", ");
        List<String> friendList = new ArrayList<>();
        for (String friend : friends) {
            friendList.add(friend);
        }

        int blacklistedCount = 0;
        int lostCount = 0;

        String input = scanner.nextLine();
        while (!input.equals("Report")) {
            String[] command = input.split(" ");
            String action = command[0];

            switch (action) {
                case "Blacklist":
                    String nameToBlacklist = command[1];
                    if (friendList.contains(nameToBlacklist)) {
                        friendList.set(friendList.indexOf(nameToBlacklist), "Blacklisted");
                        System.out.println(nameToBlacklist + " was blacklisted.");
                        blacklistedCount++;
                    } else {
                        System.out.println(nameToBlacklist + " was not found.");
                    }
                    break;
                case "Error":
                    int index = Integer.parseInt(command[1]);
                    if (isValidIndex(index, friendList) && !friendList.get(index).equals("Blacklisted") && !friendList.get(index).equals("Lost")) {
                        String lostName = friendList.get(index);
                        friendList.set(index, "Lost");
                        System.out.println(lostName + " was lost due to an error.");
                        lostCount++;
                    }
                    break;
                case "Change":
                    int changeIndex = Integer.parseInt(command[1]);
                    if (isValidIndex(changeIndex, friendList)) {
                        String newName = command[2];
                        String currentName = friendList.get(changeIndex);
                        friendList.set(changeIndex, newName);
                        System.out.println(currentName + " changed his username to " + newName + ".");
                    }
                    break;
            }

            input = scanner.nextLine();
        }

        System.out.println("Blacklisted names: " + blacklistedCount);
        System.out.println("Lost names: " + lostCount);
        for (String friend : friendList) {
            System.out.print(friend + " ");
        }
    }

    private static boolean isValidIndex(int index, List<String> friendList) {
        return index >= 0 && index < friendList.size();
    }
}