question: public static < E > ForkJoinTask < E > forEach ( Collection < E > list , Predicate < E > operation ) { if ( list . size ( ) > 0 ) { @ SuppressWarnings ( "unchecked" ) E [ ] objects = list . toArray ( ( E [ ] ) new Object [ list . size ( ) ] ) ; CountedCompleter < E > completer = new ForEach < E > ( null , operation , 0 , objects . length , objects ) ; return completer ; } return null ; }
target:  Calls predicate for each element in the collection asynchronously. Utilizes Fork/Join framework to speed up processing, by using a divide/conquer algorithm