Java ArrayList.removeAll (), but for indexes

Question

Is there a way to do something like this:

ArrayList<String>.removeAll(ArrayList<Integer>)

C ArrayList<Integer>will be the indexes that I want to delete. I know that I could iterate over the list of indexes and use remove(index), but I was wondering if there was a way with one command to do this.

I know how to put this iteration on one line, my question is whether there is a way implemented by oracle.

Answer 1

You can use Streamto iterate over indices for deletion. However, first take care to remove the highest index to avoid shifting other elements to remove from position.

public void removeIndices(List<String> strings, List<Integer> indices)
{
     indices.stream()
         .sorted(Comparator.reverseOrder())
         .forEach(strings::remove);
}

String , remove(int). List<Integer>, remove(E), .mapToInt(Integer::intValue) forEach.

Answer 2

Java 8.

:

IntStream.of(7,6,5,2,1).forEach(i->list.remove(i));

List<Integer>, :

indexList.stream().mapToInt(Integer::intValue).forEach(i->list.remove(i));

, IntStream, Stream<Integer>, Stream<Integer> , , , List<Integer>, remove(Integer) , Integer, Integer.