Java Utililty Methods Collection to String

if (list.size() == 0) {
    return "";
StringBuilder output = new StringBuilder();
for (Object element : list) {
    output.append(element.toString()).append(delimiter);
String outputStr = output.toString();
...

return c.toString();

StringBuilder sb = new StringBuilder("[");
Iterator<?> i = c.iterator();
while (i.hasNext()) {
    Object o = i.next();
    if (o == null)
        sb.append("null");
    else if (o == c)
        sb.append("(this Collection)");
...

final Object[] a = c.toArray();
final int size = a.length;
if (size == 0)
    return "[]";
int charLength = 0;
for (int i = 0; i < size; i++) {
    Object e = a[i];
    String s = (e == c) ? "(this Collection)" : objectToString(e);
...

return collectionToString(c, null);

Iterator<?> i = c.iterator();
StringBuffer sb = new StringBuffer();
boolean isNext = false;
while (i.hasNext()) {
    if (isNext) {
        sb.append(separator);
    } else {
        isNext = true;
...

return collectionToString(coll, connectSymbol, "", "");

StringBuilder sb = new StringBuilder();
for (Object o : collection) {
    sb.append(o.toString());
    if (separator != null) {
        sb.append(separator);
if (sb.length() >= separator.length()) {
...

if (collection == null || collection.size() == 0) {
    return "";
StringBuffer s = new StringBuffer(32 * collection.size());
Iterator<?> i = collection.iterator();
s.append(i.next());
while (i.hasNext()) {
    s.append(separator).append(i.next());
...

if (elements == null) {
    return NULL_STR;
int size = elements.size();
if (size == 0) {
    return "[]";
} else if (size == 1) {
    return "[" + elements.toArray()[0] + "]";
...