O1. Activation Key / FinalExam - O5

package FinalExam.O5;

import java.util.Scanner;

public class O1ActivationKey {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        StringBuilder key = new StringBuilder(scanner.nextLine());
        String input;

        while (!"Generate".equals(input = scanner.nextLine())) {
            String[] command = input.split(">>>");
            switch (command[0]){
                case"Contains":
                    if (key.toString().contains(command[1])) {
                        System.out.printf("%s contains %s%n", key, command[1]);
                    } else {
                        System.out.println("Substring not found!");
                    }
                    break;
                case"Slice":
                    key.delete(Integer.parseInt(command[1]), Integer.parseInt(command[2]));
                    System.out.println(key);
                    break;
                case"Flip":
                    if (command[1].equals("Upper")) {
                        key.replace(Integer.parseInt(command[2]), Integer.parseInt(command[3]),
                                key.substring(Integer.parseInt(command[2]), Integer.parseInt(command[3])).toUpperCase());

                    } else {
                        key.replace(Integer.parseInt(command[2]), Integer.parseInt(command[3]),
                                key.substring(Integer.parseInt(command[2]), Integer.parseInt(command[3])).toLowerCase());
                    }
                    System.out.println(key);
                    break;
            }
        }
        System.out.println("Your activation key is: " + key);
    }
}