Java Utililty Methods Collection to String

final StringBuilder sb = new StringBuilder();
if (collection != null) {
    for (final Iterator iterator = collection.iterator(); iterator.hasNext();) {
        final Object obj = iterator.next();
        if (obj != null) {
            sb.append(obj.toString());
            if (iterator.hasNext()) {
                sb.append(recordSeparator);
...

StringBuilder wRes = new StringBuilder(2048);
Iterator<?> wIt = aCol.iterator();
while (wIt.hasNext()) {
    if (wRes.length() != 0) {
        wRes.append(aSepLines);
    Object wObj = wIt.next();
    if (wObj == null) {
...

final Iterator<?> iter = c == null ? null : c.iterator();
if (!hasNext(iter)) {
    return null;
final StringBuilder sb = new StringBuilder();
for (; iter.hasNext();) {
    final String s = toString(iter.next());
    if (s != null) {
...

StringBuilder sb = new StringBuilder();
for (Iterator<?> iter = collection.iterator(); iter.hasNext();) {
    sb.append(iter.next());
    if (iter.hasNext()) {
        sb.append(separator);
return sb.toString();
...

String result = "";
final Iterator<?> iterator = elements.iterator();
while (iterator.hasNext()) {
    final Object object = iterator.next();
    result += object.toString();
    if (iterator.hasNext())
        result += separator;
return result;

final StringBuffer buf = new StringBuffer();
final Iterator<?> it = coll.iterator();
while (it.hasNext()) {
    final Object item = it.next();
    if (item == null) {
        buf.append("null");
    } else {
        buf.append(item.toString());
...

StringBuilder b = new StringBuilder();
b.append("[");
Iterator<T> it = c.iterator();
while (it.hasNext()) {
    b.append(it.next());
    if (it.hasNext())
        b.append(",");
b.append("]");
return b.toString();

String s = "";
for (int i = 0; i < objects.length; i++) {
    s += objects[i].toString();
    if (i < objects.length - 1) {
        s += ", ";
return s;
...

if (list == null)
    return "null";
StringBuilder sb = new StringBuilder();
sb.append(prefix);
sb.append('[');
boolean first = true;
for (Object item : list) {
    if (!first) {
...

String[] ret = new String[holder.size()];
holder.toArray(ret);
return (ret);