ArrayList#size() 多于实际的对象数 [英] ArrayList#size() is more than actual number of objects

问题描述

我的 Android 应用中有一个 ArrayList，其中有 2 个项目.然而，它的 size 方法返回 3.我知道这听起来非常简单和愚蠢，但它是这样的:

I have an ArrayList in my Android app, and it has 2 items in it. However, its size method returns 3. I know it sounds really simply and stupid, but here is how it goes:

为什么会这样?ArrayList 的大小如何返回不正确的数字?当我迭代列表时，这会导致空指针异常.

Why would this happen? How can an ArrayList's size return an incorrect number? This causes a null pointer exception when I'm iterating the list.

推荐答案

IntelliJ 有一个关于隐藏 null 值的设置.右键单击调试器中的变量部分，然后选择 Customize Data Views....Hide null array elements 有一个选项，你应该确保没有勾选.

IntelliJ has a setting about hiding null values. Right click the variables section in the debugger and choose Customize Data Views.... There is an option there for Hide null array elements that you should make sure is unticked.

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