Java Utililty Methods Iterable

T el = null;
Iterator<T> it = iterable.iterator();
for (int i = 0; it.hasNext(); i++) {
    T cur = it.next();
    if (i == index) {
        el = cur;
        break;
return el;

if (iterable instanceof List<?>) {
    return ((List<DataType>) iterable).get(index);
} else {
    if (index < 0) {
        throw new IndexOutOfBoundsException("index must be >= 0");
    for (DataType v : iterable) {
        if (index == 0) {
...

return getIdenticalElement(iterable.iterator());

Iterator<String> it = iterable.iterator();
String commonToken = it.next();
while (it.hasNext()) {
    if (commonToken == "") {
        return null;
    String name = it.next();
    if (!name.startsWith(commonToken)) {
...

String str = "";
Iterator iter = msgs.iterator();
while (iter.hasNext())
    str += iter.next() + ", ";
return str;

final Iterator<? extends T> iter = iterable.iterator();
if (!iter.hasNext()) {
    throw new IllegalArgumentException("No element in " + iterable);
final T result = iter.next();
if (iter.hasNext()) {
    throw new IllegalArgumentException("More than (expected) one element in " + iterable);
return result;

StringBuffer stringBuffer = new StringBuffer();
for (Iterator<String> i = strings.iterator(); i.hasNext();) {
    String varClassName = i.next();
    stringBuffer.append(varClassName);
    if (i.hasNext()) {
        stringBuffer.append(glue);
return stringBuffer.toString();

int ix = 0;
Iterator<? extends T> iterator = iterable.iterator();
while (iterator.hasNext()) {
    T element = iterator.next();
    if (element == obj)
        return ix;
    ix++;
return -1;

Iterator<?> i = args.iterator();
if (i.hasNext()) {
    for (;;) {
        Object thing = i.next();
        buff.append(thing.toString());
        if (i.hasNext()) {
            buff.append(separator);
        } else
...

 isEmpty( null ) = true isEmpty( Arrays.asList()) = true isEmpty( Arrays.asList("") ) = false 

boolean retval = true;
if (iterable != null) {
    Iterator<?> iterator = iterable.iterator();
    retval = iterator == null || !iterator.hasNext();
return retval;