Java Utililty Methods Iterable Join

return new Iterable<T>() {
    public Iterator<T> iterator() {
        return new Iterator<T>() {
            int index;
            Iterator<? extends T> current;
            T next;
            public boolean hasNext() {
                if (next == null) {
...

final StringBuilder sequence = new StringBuilder();
final Iterator<?> iter = items.iterator();
if (iter.hasNext()) {
    final String first = iter.next().toString();
    sequence.append(first);
    while (iter.hasNext()) {
        sequence.append(separator);
        final String next = iter.next().toString();
...

Joins the elements of the provided Iterable into a single String containing the provided elements.

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

return join(container, "");

return join(iterable.iterator(), joinString);

Iterator<T> iter = objs.iterator();
if (!iter.hasNext())
    return "";
StringBuffer buffer = new StringBuffer(String.valueOf(iter.next()));
while (iter.hasNext())
    buffer.append(delimiter).append(String.valueOf(iter.next()));
return buffer.toString();

Iterator<T> iter = objs.iterator();
if (!iter.hasNext()) {
    return "";
StringBuffer buffer = new StringBuffer(String.valueOf(iter.next()));
while (iter.hasNext()) {
    buffer.append(delimiter).append(String.valueOf(iter.next()));
return buffer.toString();

return join(source, DEFAULT_JOIN_SEPARATOR, DEFAULT_JOIN_NULL_BEHAVIOR);

return () -> new Iterator<T>() {
    private int which = 0;
    private Iterator<T> iterator = null;
        while (which < iterables.length) {
            iterator = iterables[which].iterator();
            if (iterator.hasNext())
                break;
...

if (objs == null)
    return "";
Iterator<T> iter = objs.iterator();
if (!iter.hasNext())
    return "";
String delim = delimiter;
if (delimiter == null)
    delim = "";
...