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

Stringjoin(Collection strings, String sep)
Join a collection of strings by a seperator 
return join(strings.iterator(), sep);
Stringjoin(Collection strings, String separator)
join 
return join((String[]) strings.toArray(new String[0]), separator);
Stringjoin(Collection tokens, String separator)
join 
StringBuffer sb = new StringBuffer();
for (Iterator it = tokens.iterator(); it.hasNext();) {
    Object o = it.next();
    if (o != null) {
        sb.append(o.toString());
    } else {
        sb.append("NULL");
    if (it.hasNext()) {
        sb.append(separator);
return sb.toString();
Stringjoin(Collection var0, Object var1)
Borrowed from apache StringUtils. 
StringBuffer var2 = new StringBuffer();
for (Iterator var3 = var0.iterator(); var3.hasNext(); var2.append(var3.next())) {
    if (var2.length() != 0) {
        var2.append(var1);
return var2.toString();
Stringjoin(Collection c, String joinWith)
Returns a string consisting of all members of a collection separated by the specified string. 
if (c == null)
    return "";
StringBuilder buf = new StringBuilder();
boolean first = true;
for (Object obj : c) {
    if (first)
        first = false;
    else if (joinWith != null)
...
Stringjoin(Collection collection, String joinString)
join 
StringBuilder sb = new StringBuilder();
Iterator<? extends Object> iter = collection.iterator();
while (iter.hasNext()) {
    sb.append(iter.next());
    if (iter.hasNext()) {
        sb.append(joinString);
return sb.toString();
Stringjoin(Collection collection, String separator)
Joins a collection of Objects separated by a specified separator 
if (collection == null) {
    return null;
Iterator iterator = collection.iterator();
if (iterator == null) {
    return null;
if (!iterator.hasNext()) {
...
Stringjoin(Collection elements, String separator)
join 
Iterator<? extends Object> iterator = elements.iterator();
if (iterator.hasNext()) {
    StringBuilder builder = new StringBuilder();
    builder.append(iterator.next().toString());
    while (iterator.hasNext()) {
        builder.append(separator);
        builder.append(iterator.next().toString());
    return builder.toString();
} else {
    return "";
Stringjoin(Collection list, String separator)
join 
StringBuilder sb = new StringBuilder();
for (Object o : list) {
    sb.append(o.toString());
    sb.append(separator);
if (sb.length() > 0 && separator.length() > 0) {
    sb.delete(sb.length() - separator.length(), sb.length());
return sb.toString();
Stringjoin(Collection objects, String delim)
Join a set of strings into one string, putting the specified delimiter between adjacent strings. 
String result = "";
if (objects.size() > 0) {
    String[] array;
    int i;
    Iterator it;
    i = 0;
    for (it = objects.iterator(); it.hasNext();) {
        Object o = it.next();
...