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 separator)
Joins the elements of the provided Collection collection into a single String string , using the provided separator and string elements. 
StringBuilder sb = new StringBuilder();
if (strings != null) {
    Iterator<? extends Object> i = strings.iterator();
    while (i.hasNext()) {
        sb.append(i.next());
        if (i.hasNext()) {
            sb.append(separator);
return sb.toString();
Stringjoin(Collection strs, String separator)
join 
StringBuilder result = null;
for (Object o : strs) {
    if (result == null) {
        result = new StringBuilder();
    } else {
        result.append(separator);
    result.append(o);
...
Stringjoin(Collection c, String delim)
Similar to perl's join() method on lists, but works with all collections. 
StringBuilder retval = new StringBuilder();
Iterator<?> itr = c.iterator();
if (itr.hasNext())
    retval.append(itr.next());
else
    return "";
while (itr.hasNext()) {
    retval.append(delim);
...
Stringjoin(Collection c, String delimiter)
Returns a String formed by the delimited results of calling toString over a collection. 
StringBuffer sb = new StringBuffer();
boolean needComma = false;
for (Object o : c) {
    if (needComma) {
        sb.append(delimiter);
    needComma = true;
    sb.append(o.toString());
...
Stringjoin(Collection c, String insert)
Return the string created by inserting insert between the members of c . 
return join(c, insert, insert);
Stringjoin(Collection c, String separator)
Join operation on a collection 
if (!isSet(separator)) {
    throw new IllegalArgumentException("Separator is null or empty");
if (c == null || c.size() == 0) {
    return "";
StringBuilder sb = new StringBuilder();
for (Object element : c) {
...
Stringjoin(Collection col, String delim)
join 
StringBuilder sb = new StringBuilder();
Iterator<?> iter = col.iterator();
if (iter.hasNext())
    sb.append(iter.next().toString());
while (iter.hasNext()) {
    sb.append(delim);
    sb.append(iter.next().toString());
return sb.toString();
Stringjoin(Collection col, String separator)
join 
StringBuilder sb = new StringBuilder();
Iterator<?> it = col.iterator();
if (!col.isEmpty()) {
    Object obj = it.next();
    sb.append(obj.toString());
while (it.hasNext()) {
    Object obj = it.next();
...
Stringjoin(Collection coll, String delim)
Convenience method to return a Collection as a delimited (e.g. 
return join(coll, delim, "", "");
Stringjoin(Collection collection, String delimiter)
Joins a Collection of typed objects using their toString method, separated by delimiter 
if (collection == null || collection.isEmpty()) {
    return EMPTY_STRING;
} else if (delimiter == null) {
    delimiter = EMPTY_STRING;
StringBuilder builder = new StringBuilder();
Iterator<?> it = collection.iterator();
while (it.hasNext()) {
...