protected void removeRange(int fromIndex, int toIndex) {
checkForComodification();
l.removeRange(fromIndex + offset, toIndex + offset);
expectedModCount = l.modCount;
size -= (toIndex - fromIndex);
modCount++;
}
/**
* Removes all of the elements from this list (optional operation). The list will be empty after
* this call returns.
*
* <p>This implementation calls {@code removeRange(0, size())}.
*
* <p>Note that this implementation throws an {@code UnsupportedOperationException} unless {@code
* remove(int index)} or {@code removeRange(int fromIndex, int toIndex)} is overridden.
*
* @throws UnsupportedOperationException if the {@code clear} operation is not supported by this
* list
*/
public void clear() {
removeRange(0, size());
}