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

StringBuilderjoinToStringBuilder(Collection collection, String separator)
Concatenates the Collection of Objects (converted to Strings using .toString()) into a StringBuilder using the separator as the delimiter. 
if (collection == null) {
    return new StringBuilder();
StringBuilder result = new StringBuilder(collection.size() * 10);
boolean needjoin = false;
for (Object obj : collection) {
    if (needjoin) {
        result.append(separator);
...
StringjoinValues(Collection values, String separator)
join Values 
StringBuilder builder = new StringBuilder();
boolean first = true;
for (String value : values) {
    if (!first) {
        builder.append(separator);
    } else {
        first = false;
    builder.append(value);
return builder.toString();
Stringroundjoin(Collection s, String delimiter)
roundjoin 
StringBuffer buffer = new StringBuffer();
Iterator iter = s.iterator();
while (iter.hasNext()) {
    buffer.append(String.valueOf(Math.round(328.084 * ((Double) iter.next())) / 100.00));
    if (iter.hasNext()) {
        buffer.append(delimiter);
return buffer.toString();
StringstringJoin(Collection list, String delim)
string Join 
StringBuilder sb = new StringBuilder();
for (Object s : list) {
    if (s == null) {
        continue;
    if (sb.length() > 0) {
        sb.append(delim);
    sb.append(s.toString());
return sb.toString();
StringstringJoin(java.util.Collection s, String delimiter)
string Join 
StringBuilder builder = new StringBuilder();
java.util.Iterator<?> iter = s.iterator();
while (iter.hasNext()) {
    builder.append(iter.next());
    if (!iter.hasNext()) {
        break;
    builder.append(delimiter);
...