使用增强的For循环在ArrayList中打印对象时出现问题

ArrayList<Object> list = new ArrayList<>();
// 添加对象到ArrayList中

for (int i = 0; i < list.size(); i++) {
    Object obj = list.get(i);
    System.out.println(obj);
}

ArrayList<Object> list = new ArrayList<>();
// 添加对象到ArrayList中

Iterator<Object> iterator = list.iterator();
while (iterator.hasNext()) {
    Object obj = iterator.next();
    System.out.println(obj);
}