A list of items that gets a list into a single list :)

ListOfLists.java

/** 
* Take a list of items, iterate, and get some list of items then flatten that list of items into a single list.
*/
List<String> indexed = listOfStrings.stream()
                                 .map(li -> li.getSomeListOfItems())
                                 .flatMap(List::stream)
                                 .collect(toList());