Remove random index from array List

Question

I have an ArrayList of 4 elements. I need to delete one element randomly and display the updated ArrayList. However, my random object retains targeting for the second and third elements in the array list. As far as I understand, my random case would be this: 0 1 2 3. Is this not enough to cover my 4 elements? Why does it support targeting the same indexes? I tried to increase the random number (4) + 1, but that takes me beyond.

Random rand = new Random();
Scanner input = new Scanner(System.in);
int numberOfGuests = 4;
ArrayList<String> guestList = new ArrayList<>(4); 
System.out.println("Enter 4 guests:");

for(int i = 1; i <=numberOfGuests; i++){
    System.out.printf("guest%d: ", i);
    guestList.add(input.nextLine());
}
System.out.println("Guest List: " + guestList);
String remove = guestList.remove(rand.nextInt(4)); 
System.out.printf("%s can't come%n" , remove);   
System.out.println("Guest List: " + guestList);

Answer 1

yoy checks when you produce an arbitrary number of users, the rage level is set to the length of the array minus one, for example, in your case

String remove = guestList.remove(rand.nextInt(3));