// Go through the ArrayList, incrementing the indexing variable each time an element is accessed (like a rolling pointer)
        for(int i = 0; i < fileInfo.size(); ) {
            bookShelf.add(
                    writeBook(
                            fileInfo.get(i++),   //title
                            fileInfo.get(i++),   //author
                            fileInfo.get(i++),   //isbn
                            fileInfo.get(i++),   //subject
                            fileInfo.get(i++),   //parentInfo
                            fileInfo.get(i++))); //subjectInfo
        }