Java Object Null Check for method

java, null-check

Solution

First you should check if `books` itself isn't null, then simply check whether `books[i] != null`:

if(books==null) throw new IllegalArgumentException();

for (int i = 0; i < books.length; i++){
   if(books[i] != null){
        total += books[i].getPrice();
   }
}

Problem

I need to create a null check in this formula for the books[i] and I am not entirely sure how to go about this as I am not greatly familiar with null checks and very new at programming. Any and all help is much appreciated! ``` public static double calculateInventoryTotal(Book[] books) { double total = 0; for (int i = 0; i < books.length; i++) { total += books[i].getPrice(); } return total; } ```

Original source