Java Utililty Methods String from List

String result = "[";
for (int i = 0; i < list.size() - 1; i++) {
    result += list.get(i) + ",";
if (list.size() > 0) {
    result += list.get(list.size() - 1);
result += "]";
...

if (list != null) {
    final String[] str = new String[list.size()];
    int i = 0;
    for (final String l : list) {
        str[i++] = l;
    return str;
return null;

Object[] params = null;
if (list != null) {
    params = list.toArray(new String[list.size()]);
return params;

int paramsSize = params.size();
String returnString[] = new String[params.size()];
for (int i = 0; i < paramsSize; i++) {
    returnString[i] = params.get(i);
return returnString;

final StringBuilder sb = new StringBuilder();
if ((l != null) && (l.size() > 0)) {
    for (int i = 0; i < l.size() - 1; ++i) {
        sb.append(l.get(i) + separator);
    sb.append(l.get(l.size() - 1));
return sb.toString();
...

if (list == null)
    return "";
StringBuilder sb = new StringBuilder();
for (String item : list) {
    if (sb.length() > 0) {
        sb.append(", ");
    sb.append(item);
...

StringBuilder builder = new StringBuilder();
for (String obj : list) {
    builder.append(String.format("%s\n", obj.toString()));
return builder.toString();

if (list == null || delim == null)
    return null;
StringBuilder result = new StringBuilder();
for (Iterator<String> it = list.listIterator(); it.hasNext();)
    result.append(it.next()).append(delim);
return new String(result);

Collections.sort(ls);
return ls.toString();

StringBuilder bldr = new StringBuilder();
for (String s : stringList) {
    if (bldr.length() > 0) {
        bldr.append(delim).append(s);
    } else {
        bldr.append(s);
return bldr.toString();