java – 从arrayList中删除随机索引

我有一个4项的ArrayList.我需要随机删除一个项目并显示更新的ArrayList.然而,我的随机数继续瞄准数组列表中的第二个和第三个元素.据我所知,我的随机数会像这样：0 1 2 3.这不足以覆盖我的4个元素吗？为什么它会继续针对相同的索引？我试过增加随机数(4)1,但这让我超出界限.

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);

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