This is what you want
Note
can not add list.add(num5); before you have declared the variable. I think you want to add num4
and
Arrays.sort(list); as the name implies is for sorting Arrays.
use Collections.sort(list) instead
int n = 5;
ArrayList<Integer> list = new ArrayList<Integer>(n);
Scanner input = new Scanner(System.in);
System.out.println("Please enter 5 numbers: ");
int num1 = input.nextInt();
list.add(num1);
int num2 = input.nextInt();
list.add(num2);
int num3 = input.nextInt();
list.add(num3);
int num4 = input.nextInt();
list.add(num4);
int num5 = input.nextInt();
list.add(num5);
Collections.sort(list);
System.out.println(list);
Although a cleaner way would to be use a loop
