提示输入的数组大小

My program executes as I desire it to, however I wish to modify the scanner such that the user can specify the length of the array they are inputting. So when the program launches it will ask how many numbers. Then it will follow through with its execution of printing the numbers in order and then in reverse order. Here is my current program. What would I need to modify to allow this? My program executes as I desire it to, however