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

StringlistToString(Collection objects)
Change list to string comma separated. 
StringBuilder buffer = new StringBuilder();
int counter = 0;
for (String str : objects) {
    if (counter > 0) {
        buffer.append(",");
    counter++;
    buffer.append(str);
...
String[]listToStringArray(Collection list)
list To String Array 
if (list == null) {
    return null;
} else {
    String valueArr[] = new String[list.size()];
    list.toArray(valueArr);
    return valueArr;
StringBuilderlistToStringHelper(StringBuilder sb, String sep, Collection list)
list To String Helper 
for (Object line : list) {
    sb.append(line).append(sep);
if (sb.length() > 0) {
    sb.setLength(sb.length() - sep.length());
return sb;
Stringstringify(Collection collection)
stringify 
StringBuilder buf = new StringBuilder();
for (Object o : collection) {
    if (buf.length() > 0)
        buf.append("\n");
    buf.append(o);
return buf.toString();
Collectionstringify(Collection collection)
Converts the given collection to a collection of strings by calling toString() on each item. 
return stringify(collection, true);
StringtoStr(Collection collection)
to Str 
if (collection == null)
    return "[]";
Iterator<E> i = collection.iterator();
if (!i.hasNext())
    return "[]";
StringBuilder sb = new StringBuilder();
sb.append('[');
for (;;) {
...
String[]toStr(Collection elements)
Converts the collection into an array of strings. 
String[] strElements = null;
if (elements != null) {
    strElements = new String[elements.size()];
    Object[] oElements = elements.toArray();
    for (int i = 0; i < oElements.length; i++) {
        strElements[i] = oElements[i].toString();
return strElements;
StringtoString(Collection c)
Same as #toString(Collection,String) toString separated by ", ". 
return toString(c, ", ");
StringtoString(Collection c)
to String 
if (c == null)
    return "null";
StringBuffer str = new StringBuffer();
Iterator i = c.iterator();
str.append("[");
while (i.hasNext()) {
    Object o = i.next();
    if (o instanceof byte[])
...
StringtoString(Collection c, String start, String separator, String end)
An flexible alternative for converting a Collection to a String. 
Iterator i = c.iterator();
StringBuilder myString = new StringBuilder();
if (start != null) {
    myString.append(start);
boolean first = true;
while (i.hasNext()) {
    if (!first) {
...