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

StringasString(Collection c, String separator)
as String 
if (c == null) {
    return "";
StringBuilder result = new StringBuilder(256);
boolean needSeparator = false;
for (Object o : c) {
    if (o == null) {
        continue;
...
StringasString(Collection collection)
as String 
if (isEmpty(collection)) {
    return "";
final StringBuilder asList = new StringBuilder(64);
for (String item : collection) {
    asList.append(", ").append(item);
return asList.substring(2);
...
String[]asStringArr(Collection collection)
as String Arr 
String res[] = new String[collection.size()];
int i = 0;
for (Object s : collection) {
    res[i++] = String.valueOf(s);
return res;
String[]asStringArray(Collection coll)
Convert the collection to a string array. 
int i = 0;
String[] strings = new String[coll.size()];
for (Object o : coll) {
    strings[i++] = o.toString();
return strings;
String[]asStringArray(Collection collection)
as String Array 
String[] result = new String[collection.size()];
collection.toArray(result);
return result;
StringbuildString(Collection args, String seperator, int startingArg, int maxLength)
build String 
List<String> retList = new ArrayList<String>();
String ret = "";
for (int i = startingArg; i < args.size(); i++) {
    String s = (String) args.toArray()[i];
    ret += s + seperator;
    if (ret.length() > maxLength) {
        retList.add(ret);
        ret = "";
...
StringbuildString(Collection keys)
build String 
String build = keys.toString();
if (keys.size() == 1) {
    build = build.replace("" + OPEN_TABLE_SEPARATOR, "").replace("" + CLOSE_TABLE_SEPARATOR, "");
return build;
StringbuildStringFromListForNuma(Collection list)
build String From List For Numa 
if (!list.isEmpty()) {
    StringBuilder sb = new StringBuilder();
    for (Integer item : list) {
        sb.append(item);
        sb.append(",");
    return sb.deleteCharAt(sb.length() - 1).toString();
return "";
StringcollectionToCommaDelimitedString(Collection items)
collection To Comma Delimited String 
StringBuilder buf = new StringBuilder();
boolean first = true;
for (Object item : items) {
    if (!first) {
        buf.append(",");
    buf.append(item);
    first = false;
...
StringcollectionToCommaDelimitedString(Collection list)
Convert a List of Strings to a comma delimited String. 
if (list == null || list.isEmpty()) {
    return "";
StringBuilder sb = new StringBuilder();
final Iterator<String> it = list.iterator();
while (it.hasNext()) {
    sb.append(it.next());
    if (it.hasNext()) {
...