ArrayList of Object

Question

how to use indexof() in ArrayList of object with 3 attributes

Answer 1

If you're searching for a specific character you could use a while loop, and use the counter for its position?
Eg:
While (num > arraysize && !found)
 If array[num]==searchItem
   Found=true
Else
  Num++

Answer 2

I want to access the specific value without search the entire arraylist.