I'm stuck on the part where the user presses the "Enter" key

public class TreeHouse1 {

    public static void main(String[] args) { 
        Scanner input = new Scanner(System.in);

        String itemName;
        System.out.println("Name of items in the jar:");
        itemName = input.next();

        System.out.printf("Maximum number of %s in the jar: ", itemName);
        int integer = input.nextInt();

        System.out.printf("Your goal is to guess how many %s is in the jar. Your guess should be between 1 and %d. \n ", itemName, integer);
        System.out.println("Ready? (Press ENTER to start guessing)");



        System.out.println("Guess:  ");
        int guess = input.nextInt();
        Random random = new Random();
        int someNumber = random.nextInt(maxItemsAllowed); // Some number btwn 0&20