验证两个值包含在同一索引的单独arraylists中

I have two ArrayLists: phNumbers and pinNumbers. Both with the same amount of elements. I am trying to check if a given value is in the first phNumbers, and if it is, at what index of the phNumbers ArrayList was that value found. I then wish to check if a second value is in the pinNums ArrayList at the index previously identified. I have two ArrayLists: phNumbers and pinNumbers