private void make (String options) {
        char action, object = '\0';
        int length;

        length = options.length();

        if (length < 1 || (length < 2 && options.charAt(0) == 'c')) {
            System.out.println("Comando inválido.");
            return;
        }

        action = options.charAt(0);

        if (action == 'c') {
            object = options.charAt(1);
        }

        switch (action) {
            case CREATE: this.create(object); break;
            case READ: this.read(); break;
            case UPDATE: this.update(); break;
            case DELETE: this.delete(); break;
            default: System.out.println("Comando inválido.\n");
        }
    }