在指定索引处将按钮添加到 ArrayList [英] Add buttons to ArrayList at the specifed index

问题描述

我正在尝试向 ArrayList 添加一个按钮，但是当我指定索引时出现错误，指出索引超出范围.

I am trying to add a button to an ArrayList, but when I specify the index an error comes up saying the index is out of bounds.

我像这样启动数组:

ArrayList<Button> buttons = new ArrayList<Button>();

我有一个整数变量order"，它指示按钮的优先级.当按钮的优先级为 0 时，它应该是数组中的第一个值.

I have an Integer variable "order" which indicates the priority of the button. The button should be the first value in the array when it has priority 0.

异常出现以下语句:

buttons.add(order,btn);

order 的值大于 ArrayList 的大小.我正在动态创建按钮.我如何能够指定数组的大小?

The value of order is more than the size of the ArrayList. I am creating the buttons dynamically. How would I be able to specify the size of the array?

推荐答案

查看 ArrayList add 方法的文档..... 说明可能是什么原因...

Check the documentation for ArrayList add method ..... it tells what could be the reason...

http://docs.oracle.com/javase/7/docs/api/java/util/ArrayList.html#add(int, E)

订单的值可能大于 ArrayList 的大小.在将订单添加到列表之前打印它的值，这将有助于...

Probably value of order is more than the size of the ArrayList. Print value of order before adding it to the list it will help...

这篇关于在指定索引处将按钮添加到 ArrayList的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！