Classical set operations for java.util.Collection

Question

Is there any built-in functionality for classical set operations on the java.util.Collection class? My specific implementation would be for ArrayList, but this sounds like s

Answer 1

For mutable operations see accepted answer.

For an imutable variant you can do this with java 8

subtraction

set1
  .stream()
  .filter(item-> !set2.contains(item))
  .collect(Collectors.toSet())

intersection

set1
  .stream()
  .filter(item-> set2.contains(item))
  .collect(Collectors.toSet())