How does the % operator work in android

Question

Android

I studied a little Java, there% is the remainder of the division.
Now I'm reading a book on Android, and there is such an entry
int mCurrentIndex
...
mQuestionBank[]
...
mCurrentIndex = (mCurrentIndex + 1) % mQuestionBank.length;
...
How does it work here?
Yandex did not help with the answer
Here is the code on pastebin
pastebin.com/WuqsFYHQ

Answer 1

and it works, returns the remainder of the division;
suppose mQuestionBank.length = 5, then the remainder of dividing by 5 will be from 0 to 4.
this means that with successive calls to this line, mCurrentIndex will be assigned a value one more than the previous one, and when the value reaches 5, after receiving the remainder of the division, it will again become zero