Java Utililty Methods Collection to String

List of utility methods to do Collection to String

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Description

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

Method

String[]collectionToStringArray(Collection objs)
collection To String Array 
if (objs == null)
    return null;
String[] ret = new String[objs.size()];
int idx = 0;
for (Object o : objs) {
    ret[idx] = o.toString();
    idx++;
return ret;
String[]collectionToStringArray(List values)
collection To String Array 
String[] array = new String[values.size()];
int index = 0;
for (String value : values) {
    array[index] = value;
    index++;
return array;
ListcollectionToStringList(Collection c)
Take a collection, return a list containing the string value of every element in the collection. 
List<String> l = new ArrayList<String>(c.size());
for (Object o : c) {
    l.add(o.toString());
return l;
ListcollectionToStringList(Collection c)
Take a collection, return a list containing the string value of every element in the collection. 
List<String> l = new ArrayList<>(c.size());
for (Object o : c) {
    l.add(o.toString());
return l;
StringcollectionToStringList(Collection list, String delimiter)
Takes a collection of objects and converts them to a list where each item is converted to a string by its toString() method. 
boolean firstPass = true;
StringBuilder resultBuilder = new StringBuilder();
for (Object item : list) {
    if (firstPass) {
        firstPass = false;
    } else {
        resultBuilder.append(delimiter);
    resultBuilder.append(item.toString());
return resultBuilder.toString();
StringcommaSeparatedList(Collection objects)
comma Separated List 
StringBuilder sb = new StringBuilder();
Iterator<?> iter = objects.iterator();
while (iter.hasNext()) {
    sb.append(iter.next());
    sb.append(", ");
if (sb.length() > 2) {
    sb.deleteCharAt(sb.length() - 1);
...
StringcommaSeparatedString(List list, boolean quoteStrings)
Creates a comma-separated String from the given List of String objects. 
if (list == null) {
    return null;
StringBuffer buffer = new StringBuffer();
for (int index = 0; index < list.size(); index++) {
    if (index > 0) {
        buffer.append(',');
    String string = (String) list.get(index);
    if (quoteStrings) {
        string = quotedString(string);
    buffer.append(string);
return buffer.toString();
StringconvertCollectionToCommaDelimitedString(Collection collection)
convert Collection To Comma Delimited String 
StringBuffer sb = new StringBuffer();
if (collection != null) {
    Iterator iter = collection.iterator();
    int count = 0;
    while (iter.hasNext()) {
        String item = (String) iter.next();
        if (count != 0) {
            sb.append(", ");
...
StringconvertCollectionToString(Collection strings, String separator)
convert Collection To String 
String result = "";
boolean first = true;
for (String s : strings) {
    if (first) {
        result += s;
        first = false;
    } else {
        result += separator + s;
...
StringconvertCollectionToString(Collection coll, String delimiter)
convert Collection To String 
if (coll == null) {
    return null;
StringBuilder sb = new StringBuilder();
for (String value : coll) {
    sb.append(value);
    sb.append(delimiter);
if (sb.length() > 0) {
    sb.delete(sb.length() - delimiter.length(), sb.length());
return sb.toString();