Whole sections of code are not activating. Believe it may have to do with typecasting.

I'm writing some code that is supposed to print out a list of books that fit a criteria. But the problem is that the books the code gets to the point where the loop that checks and prints out matches starts. Then just skips over the whole loop. I tested the loop to see if it was runing at all and it doesn't seem to be.

    System.out.println("List of textbooks: ");

    NumberFormat fmt = NumberFormat.getCurrencyInstance();  //POST: converts numbers into currency form

    for(int n = 0; n<11; n++){
        for (int x=0;x<11;x++){
            if (bookList[x] instanceof Textbook){
                String newCourse = ((Textbook) bookList[x]).getCourse();
                String courseName = courseList[n];
                if(newCourse.equals(courseName)){
                    bookPrice = ((Textbook) bookList[x]).retailPrice();
                    System.out.printf("%-10s bbbsd  %-10s  %-10s  %-10s \n",
                            ((Textbook) bookList[x]).getCourse(),((Textbook) bookList[x]).getTitle(),
                            ((Textbook) bookList[x]).getAuthor(),fmt.format(bookPrice));
                    retailSum = retailSum + bookPrice;

                }
            }
        }
    }

    System.out.printf("Sum of retail book Prices: %-40s\n", fmt.format(retailSum));

This is the output I get

List of textbooks: Sum of retail book Prices: $0.00