Java Utililty Methods List to String

StringBuilder buff = new StringBuilder();
for (String item : list) {
    buff.append(item.trim()).append(",");
int len = buff.length() - 1;
buff.delete(len, len);
return buff.toString();

String ret = "";
for (int i = 0; i < list.size(); i++) {
    if (i < list.size() - 1) {
        ret += list.get(i) + delimiter;
    } else {
        ret += list.get(i);
return ret;

String strInfo = "";
if (list != null && list.size() > 0) {
    StringBuffer sf = new StringBuffer();
    for (String str : list) {
        sf.append(str);
        sf.append(expr);
    strInfo = sf.substring(0, sf.length() - 1);
...

if (list.isEmpty()) {
    return "";
int n = list.size();
StringBuilder sb = new StringBuilder();
sb.append(list.get(0));
if (n == 1) {
    return sb.toString();
...

if (list.isEmpty()) {
    return "";
int n = list.size();
StringBuilder sb = new StringBuilder();
sb.append(list.get(0));
if (n == 1) {
    return sb.toString();
...

StringBuilder strBuilder = new StringBuilder();
boolean notFirst = false;
for (String element : list) {
    if (element == null || element.trim().length() == 0) {
        continue;
    if (notFirst) {
        strBuilder.append(separator);
...

StringBuilder sb = new StringBuilder();
if (!isEmpty(list)) {
    for (int i = 0; i < list.size(); i++) {
        if (i < list.size() - 1) {
            sb.append(list.get(i) + split);
        } else {
            sb.append(list.get(i));
return sb.toString();

if (params.size() > 0) {
    StringBuffer buffer = new StringBuffer();
    for (String string : params) {
        buffer.append(string + sepator);
    String result = buffer.toString();
    return result.substring(0, result.length() - 1);
} else {
...

return listToString(pListToConvert, ",");

String newString = "";
for (Iterator<String> it = queryList.iterator(); it.hasNext();) {
    newString += it.next();
    if (it.hasNext()) {
        newString += delimitedString;
return newString;
...