Java Utililty Methods Iterable Item

Remove all elements from the given Iterable.

if (iterable instanceof Collection) {
    ((Collection<?>) iterable).clear();
} else {
    clear(iterable.iterator());

return new Iterable<T>() {
    @Override
    public Iterator<T> iterator() {
        return new Iterator<T>() {
            private final Iterator<? extends Iterable<T>> iterablesIterator = iterables.iterator();
            private Iterator<T> currentIterator = iterablesIterator.hasNext()
                    ? iterablesIterator.next().iterator()
                    : null;
...

return concat(Arrays.asList(iterables));

return new Iterable<T>() {
    final Iterator<T> it1 = first.iterator();
    final Iterator<T> it2 = second.iterator();
    @Override
    public Iterator<T> iterator() {
        return new Iterator<T>() {
            Iterator<T> curr;
            @Override
...

if (iter instanceof Collection<?>) {
    return ((Collection<?>) iter).contains(o);
} else {
    return iteratedContains(iter, o);

final Iterator<E> iter = iterator(iterable);
return hasNext(iter) ? iter.next() : null;

final Iterator<T> iterator = iterable.iterator();
if (iterator.hasNext()) {
    return iterator.next();
} else {
    throw new NoSuchElementException();

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

if (iterable instanceof List<?>) {
    return (T) ((List<?>) iterable).get(index);
return elementAt(iterable, index);

return obj.getClass().isArray() || (obj instanceof Class<?> && ((Class<?>) obj).isArray())
        || obj instanceof Iterable || obj instanceof Enumeration;