removeAll

tmp.java

  private static void removeAll(Collection<Integer>... collections) {
    for (Collection<Integer> c : collections) {
      for (int i = 0; i < c.size(); i++) {
        Collection<Integer> tmp = copyCollection(c);
        if (tmp != null) {
          long timeTaken = System.nanoTime();
          for (int j = 0; j <= i; j++) {
            tmp.remove(j);
          }
          timeTaken = timeTaken - System.nanoTime();
        }
      }
    }
  }

  private static Collection<Integer> copyCollection(Collection<Integer> c) {
    Collection<Integer> tmp = null;
    if (c instanceof ArrayList) {
      tmp = new ArrayList<>(c);
    } else if (c instanceof LinkedList) {
      tmp = new LinkedList<>(c);
    } else if (c instanceof HashSet) {
      tmp = new HashSet<>();
    }

    return tmp;
  }