Secret Chat

import java.util.Scanner;

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

        StringBuilder message = new StringBuilder(scanner.nextLine());

        String input = scanner.nextLine();
        while (!input.equals("Reveal")) {
            String[] data = input.split(":\\|:");
            String command = data[0];
            switch (command) {
                case "InsertSpace":
                    int index = Integer.parseInt(data[1]);
                    String space = " ";
                    StringBuilder newString = new StringBuilder();
                    newString.append(space)
                            .append(message
                                    .substring(index, message.length()));
                    message.replace(index, message.length(), newString.toString());
                    System.out.println(message);
                    break;
                case "Reverse":
                    StringBuilder substring = new StringBuilder(data[1]);
                    if ((message.toString()).contains(substring)) {
                        int startIndex = message.indexOf(substring.toString());
                        int endIndex = startIndex + substring.length();
                        message.delete(startIndex, endIndex);
                        substring.reverse();
                        message.append(substring);
                        System.out.println(message);
                    } else {
                        System.out.println("error");
                    }
                    break;
                case "ChangeAll":
                    String currentSubstring = data[1];
                    String replacement = data[2];
                    message = new StringBuilder(message
                            .toString()
                            .replaceAll(currentSubstring, replacement));
                    System.out.println(message);
                    break;
            }
            input = scanner.nextLine();
        }
        System.out.printf("You have a new text message: %s", message);
    }
}