I think the book wants you to add +" "+.
It can be done without that concatentation, but that uses more advanced methods that were added in
Java 8. To give you a taste of what you'll learn at some point, this prints it with the spaces in one line.
Don't worry that you don't understand the example yet. Proceed with + " " + and you'll get up to the advanced way in the future. Plus, the way without having to concatentate isn't even shorter!