Java Utililty Methods Collection Remove

if (left != null && right != null) {
    left.removeAll(right);

List<T> list = new ArrayList<>(source);
list.removeAll(remove);
return list;

boolean result = false;
for (final Object element : array) {
    result |= c.remove(element);
return result;

final List<E> list = new ArrayList<E>();
for (final E obj : collection) {
    if (!remove.contains(obj)) {
        list.add(obj);
return list;

boolean result = false;
for (final T object : objects) {
    result |= collection.remove(object);
return result;

if (data == null)
    return;
while (data.contains(value))
    data.remove(value);

boolean changed = false;
for (Object obj : toRemove) {
    changed |= collection.remove(obj);
return changed;

boolean result = false;
for (Object o : toRemove)
    result |= collection.remove(o);
return result;

T item = null;
if (collection.iterator().hasNext())
    item = collection.iterator().next();
return item;

return col.toString().replaceAll("\\[", "").replaceAll("\\]", "");