Java Utililty Methods List Join

if (parts.isEmpty()) {
    return "";
StringBuilder result = new StringBuilder();
result.append(parts.get(0));
for (int i = 1; i < parts.size(); i++) {
    result.append(separator).append(parts.get(i));
return result.toString();

StringBuilder result = new StringBuilder();
for (String part : parts) {
    if (!isNullOrEmpty(part)) {
        if (result.length() > 0) {
            result.append(separator);
        result.append(part);
return result.toString();

StringBuilder builder = new StringBuilder();
if (src != null) {
    for (T string : src) {
        builder.append(string).append(sign);
    if (builder.lastIndexOf(sign) > 0) {
        builder.delete(builder.lastIndexOf(sign), builder.length());
return builder.toString();

StringBuffer b = new StringBuffer();
for (int i = 0; i < elementList.length - 1; i++) {
    b.append(elementList[i]);
    b.append(separator); 
b.append(elementList[elementList.length - 1]);
return b.toString();

return join(Arrays.asList(list), separator);

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

final List<T> result = new ArrayList<>();
result.add(element);
result.addAll(otherElements);
return result;

StringBuilder sb = new StringBuilder();
for (int i = 0; i < strings.size(); ++i) {
    sb.append(quoteChar);
    sb.append(strings.get(i));
    if (i + 1 < strings.size()) {
        sb.append(joinChar);
    sb.append(quoteChar);
...

StringBuilder result = new StringBuilder();
boolean first = true;
for (T element : list) {
    if (first) {
        first = false;
    } else {
        result.append(separator);
    result.append(element);
return result.toString();

StringBuilder buffer = new StringBuilder("");
for (String value : values) {
    buffer.append(value);
return buffer.toString();