问题
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:
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.
回答1:
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.
来源：https://stackoverflow.com/questions/30262906/arraylistsize-is-more-than-actual-number-of-objects