Interesting article, I need to get better at these in Java!
I'm intrigued as to the purpose of the mapToInt in the sum example here:
mapToInt
System.out.println(numbers.stream().mapToInt(Integer::intValue).sum());
Why do you need that? Is numbers not already list of ints?
numbers
Hey Jamie,
I am glad you liked it!
numbers is an array of Integer's. Integer is a class in Java which simply boxs the primitive int type. Therefore I have to call intValue to get access on the actual value of the primitive type.
If you have an int array you can do this:
int[] numbers = {1, 2, 3, 4, 5}; System.out.println(Arrays.stream(numbers).sum());
Are you sure you want to hide this comment? It will become hidden in your post, but will still be visible via the comment's permalink.
Hide child comments as well
Confirm
For further actions, you may consider blocking this person and/or reporting abuse
We're a place where coders share, stay up-to-date and grow their careers.
Interesting article, I need to get better at these in Java!
I'm intrigued as to the purpose of the
mapToIntin the sum example here:Why do you need that? Is
numbersnot already list of ints?Hey Jamie,
I am glad you liked it!
numbersis an array of Integer's. Integer is a class in Java which simply boxs the primitive int type. Therefore I have to call intValue to get access on the actual value of the primitive type.If you have an int array you can do this: