Minus operation in java 8 for subtracting Lists

If you must use Streams:

List<Integer> diff = list1.stream()
  .filter(item -> !list2.contains(item))
  .collect(Collectors.toList());

Using Apache commons:

CollectionUtils.subtract(list1, list2);

Pros: Very readable. Cons: No type safety

Try this:

List<Integer> difference = new ArrayList<>(list1);
difference.removeAll(list2);
System.out.println("Remove: " + difference); //3

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