Java Utililty Methods Iterable First

return firstOrNull(iterable.iterator());

if (iterable == null) {
    return null;
final Iterator<? extends T> iterator = iterable.iterator();
if (iterator.hasNext()) {
    return iterator.next();
} else {
    return null;
...

if (iterable == null) {
    return null;
final Iterator<T> iterator = iterable.iterator();
if (iterator == null) {
    return null;
return iterator.hasNext() ? iterator.next() : null;
...

if (iterable instanceof List) {
    final List<T> list = (List<T>) iterable;
    if (list.isEmpty())
        throw new NoSuchElementException();
    return list.get(0);
} else {
    return iterable.iterator().next();

final Iterator<T> it = c.iterator();
if (!it.hasNext()) {
    return null;
} else {
    return it.next();

T result = null;
if (iterable != null) {
    result = getFirst(iterable.iterator());
return result;

try {
    if (iterable != null) {
        Iterator<T> iter = iterable.iterator();
        return iter.next();
    } else {
        return null;
} catch (NoSuchElementException e) {
...

return getFirst(iterable, null);

Iterator<T> iterator = iterable.iterator();
return iterator.hasNext() ? iterator.next() : defaultValue;

if (!(maybeIterable instanceof Iterable<?>))
    return null;
Iterable<?> iterable = (Iterable<?>) maybeIterable;
Iterator<?> iterator = iterable.iterator();
return iterator.hasNext() ? iterator.next() : null;