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(final String sep, final Collection c)
Join a bunch of objects into a string delimited by the separator 
if (c == null) {
    return null;
if (c.size() == 1) {
    return String.valueOf(c.iterator().next());
if (c.size() == 0) {
    return "";
...
Stringjoin(final String sep, final Collection strs)
Join the given strings, separated by the given separator. 
final StringBuilder sb = new StringBuilder();
String s = "";
for (final String str : strs) {
    sb.append(s).append(str);
    s = sep;
return sb.toString();
Stringjoin(final String separator, final Collection objects)
Returns a string of the form elt1.toString() [sep elt2.toString() ... 
if (objects.isEmpty()) { 
    return "";
} else {
    final Iterator<T> iter = objects.iterator();
    final T first = iter.next();
    if (!iter.hasNext()) 
        return first.toString();
    else { 
...
Stringjoin(final String separator, final Collection objects)
Returns a string of the form elt1.toString() [sep elt2.toString() ... 
if (objects.isEmpty()) { 
    return "";
} else {
    final Iterator<T> iter = objects.iterator();
    final T first = iter.next();
    if (!iter.hasNext()) 
        return first.toString();
    else { 
...
Stringjoin(final String separator, final Collection objects)
Returns a string of the form elt1.toString() [sep elt2.toString() ... 
if (objects.isEmpty()) { 
    return "";
} else {
    final Iterator<T> iter = objects.iterator();
    final T first = iter.next();
    if (!iter.hasNext()) 
        return first.toString();
    else { 
...
Stringjoin(Iterable collection, String delimiter)
Concatenates the elements from the collection to one string. 
return join(collection.iterator(), delimiter);
Stringjoin(Iterable collection)
join 
return join(collection, DEFAULT_DELIMITER);
Stringjoin(String c, Collection d)
Similar to join / implode in php. 
StringBuilder res = new StringBuilder();
boolean notFirst = false;
for (Iterator i = d.iterator(); i.hasNext();) {
    if (notFirst)
        res.append(c);
    else
        notFirst = true;
    res.append(i.next());
...
Stringjoin(String delim, Collection list)
join 
return join(delim, list.toArray());
Stringjoin(String delim, Collection col)
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();