Java Utililty Methods Collection Join

List of utility methods to do Collection Join

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Description

The list of methods to do Collection Join are organized into topic(s).

Method

StringjoinSorted(Collection s, String delimiter)
join Sorted 
List list = new ArrayList(s);
Collections.sort(list);
return join(list, delimiter);
StringjoinString(Collection values, String delimiter)
join String 
StringBuilder sb = new StringBuilder();
for (String value : values) {
    sb.append(value);
    sb.append(delimiter);
if (sb.length() >= delimiter.length()) {
    sb.setLength(sb.length() - delimiter.length());
return sb.toString();
StringjoinStringCollection(Collection collection, String separator)
join String Collection 
if (collection == null)
    return null;
if (collection.size() == 0)
    return "";
StringBuilder b = new StringBuilder();
Iterator<String> i = collection.iterator();
while (i.hasNext()) {
    if (b.length() > 0)
...
StringjoinStrings(Collection strings)
Join a collection of strings into a single String object, in the order indicated by the collection's iterator. 
StringBuffer buf = new StringBuffer();
if (strings == null) {
    throw new NullPointerException("Received null collection");
for (Iterator it = strings.iterator(); it.hasNext();) {
    Object obj = it.next();
    if (obj == null) {
        throw new NullPointerException("Received collection containing null object");
...
StringjoinStrings(Collection names)
join Strings 
StringBuilder sb = new StringBuilder(1000);
for (String name : names) {
    if (sb.length() > 0) {
        sb.append(", ");
    sb.append(name);
return sb.toString();
...
StringjoinStrings(Collection strings)
Join a collection of strings into a single String object, in the order indicated by the collection's iterator. 
StringBuilder buf = new StringBuilder();
if (strings == null) {
    throw new NullPointerException("Received null collection");
for (String s : strings) {
    buf.append(s);
return buf.toString();
...
StringjoinStrings(String delim, Collection strs)
Joins a collection of strings together sepeated by a delim in the middle 
StringBuilder sb = new StringBuilder();
boolean first = true;
for (String str : strs) {
    if (first) {
        first = false;
    } else {
        sb.append(delim);
    sb.append(str);
return sb.toString();
CollectionjoinStringValues(Collection values)
Join the String values while preserving the non-String values. 
StringBuilder buffer = new StringBuilder();
List<Object> betterValues = new ArrayList<>();
for (Object value : values) {
    if (value instanceof String) {
        if (buffer.length() > 0) {
            buffer.append(" ");
        buffer.append((String) value);
...
voidjoinTo(Collection data, String sep, StringBuilder sb)
join To 
if (data == null || data.isEmpty())
    return;
Iterator<?> iterator = data.iterator();
sb.append(String.valueOf(iterator.next()));
while (iterator.hasNext()) {
    Object obj = iterator.next();
    sb.append(sep).append(String.valueOf(obj));
StringjoinTogether(Collection items, String delim)
join Together 
StringBuffer ret = new StringBuffer();
for (Iterator<String> it = items.iterator(); it.hasNext();) {
    ret.append(it.next());
    if (it.hasNext()) {
        ret.append(delim);
return ret.toString();
...