question: public static < T > int detectLastIndex ( List < T > list , Predicate < ? super T > predicate ) { if ( list instanceof RandomAccess ) { return RandomAccessListIterate . detectLastIndex ( list , predicate ) ; } int size = list . size ( ) ; int i = size - 1 ; ListIterator < T > reverseIterator = list . listIterator ( size ) ; while ( reverseIterator . hasPrevious ( ) ) { if ( predicate . accept ( reverseIterator . previous ( ) ) ) { return i ; } i -- ; } return - 1 ; }
target:  Returns the last index where the predicate evaluates to true. Returns -1 for no matches.