Java Utililty Methods Collection Convert

List of utility methods to do Collection Convert

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Description

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

Method

StringtoSeparatedString(Collection items, String separator)
Convert a collection of items to a string separated by a specified string 
return toSeparatedString(items.toArray(new Object[items.size()]), separator);
StringtoSeperatedString(final Collection list)
to Seperated String 
final StringBuffer stringBuffer = new StringBuffer();
for (final T element : list) {
    if (stringBuffer.length() != 0)
        stringBuffer.append(",");
    stringBuffer.append(element.toString());
return stringBuffer.toString();
SettoSet(Collection c)
to Set 
return asSet(c);
TtoSingleton(Collection l)
to Singleton 
return toSingleton(l.iterator());
StringtoSQLIn(Collection values)
to SQL In 
if (values == null || values.isEmpty())
    return null;
String[] strvalues = new String[0];
strvalues = (String[]) values.toArray(new String[values.size()]);
return toSQLIn(strvalues);
StringBuildertoStringBuilder(Collection collection, String delimiter)
Transform a collection of objects to a delimited String. 
StringBuilder sb = new StringBuilder(collection.size() * 20);
for (Iterator<? extends Object> it = collection.iterator(); it.hasNext();) {
    Object cs = it.next();
    sb.append(cs);
    if (it.hasNext()) {
        sb.append(delimiter);
return sb;
ListtoStringColl(Collection set)
to String Coll 
List<String> list = new ArrayList<String>();
toStringColl(list, set);
return list;
StringtoSV(Collection collection, String separator)
to SV 
if (collection == null) {
    return null;
StringBuilder sb = new StringBuilder();
Iterator itr = collection.iterator();
while (itr.hasNext()) {
    sb.append(itr.next());
    if (itr.hasNext()) {
...
Object[][]toTestParameters(Collection rawParams)
to Test Parameters 
Object[][] testParams = new Object[rawParams.size()][];
int counter = 0;
for (Object curRawParam : rawParams)
    testParams[counter++] = new Object[] { curRawParam };
return testParams;
StringtoToolTip(final Collection collection)
to Tool Tip 
if (collection == null || collection.size() == 0) {
    return null;
final String START_SEPARATOR = "<p>"; 
final String END_SEPARATOR = "</p>"; 
final StringBuffer buffer = new StringBuffer("<html>"); 
for (Iterator<?> iterator = collection.iterator(); iterator.hasNext();) {
    buffer.append(START_SEPARATOR);
...