Java Utililty Methods Iterable Join

Iterator it = elements.iterator();
if (elements == null || !it.hasNext())
    return "";
StringBuilder sb = new StringBuilder();
for (Object element = it.next(); it.hasNext(); element = it.next()) {
    sb.append(element.toString());
    if (it.hasNext())
        sb.append(delimiter);
...

Iterator<? extends CharSequence> it = iterable.iterator();
if (!it.hasNext())
    return "";
StringBuilder sb = new StringBuilder(it.next());
while (it.hasNext()) {
    sb.append(delimiter).append(it.next());
return sb.toString();
...

@SuppressWarnings("unchecked")
Iterator<String> iter = (Iterator<String>) s.iterator();
StringBuffer buffer = new StringBuffer(iter.next());
while (iter.hasNext())
    buffer.append(delimiter).append(iter.next());
return buffer.toString();

return join(iterable, delimiter, "", "");

String returnMe = "";
Iterator<? extends Object> iterator = joinee.iterator();
while (iterator.hasNext()) {
    returnMe += iterator.next().toString();
    if (iterator.hasNext())
        returnMe += joiner;
return returnMe;
...

StringBuilder sb = new StringBuilder();
Iterator<?> it = c.iterator();
while (it.hasNext()) {
    sb.append(it.next());
    if (!it.hasNext())
        break;
    sb.append(delimeter);
return sb.toString();

if (elements == null)
    return "";
StringBuilder buf = new StringBuilder();
if (separator == null)
    separator = " ";
for (Object o : elements) {
    if (buf.length() > 0)
        buf.append(separator);
...

if (elements == null) {
    return "";
return join(elements.iterator(), separator);

if (elements == null) {
    return "";
return join(elements.iterator(), separator);

return join(items, "");