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

TreeSettoTreeSet(Collection collection, Comparator comparator)
to Tree Set 
final TreeSet<T> treeSet = new TreeSet<T>(comparator);
for (T t : collection) {
    treeSet.add(t);
return treeSet;
AnyCollectiontoUnmodifiableCollection( AnyCollection collection)
Transforms the collection to an unmodifiable one, if there is any implementation in the Java Collections utilities. 
if (collection == null) {
    return null;
if (collection instanceof List<?>) {
    return (AnyCollection) Collections.unmodifiableList((List<?>) collection);
if (collection instanceof NavigableSet<?>) {
    return (AnyCollection) Collections.unmodifiableNavigableSet((NavigableSet<?>) collection);
...
CollectiontrimCollection(Collection collectionToBeConverted)
trim Collection 
Collection convertCaseValues = new ArrayList<String>(collectionToBeConverted.size());
for (Iterator<String> iterator = collectionToBeConverted.iterator(); iterator.hasNext();) {
    String s = iterator.next();
    convertCaseValues.add(s.trim());
return convertCaseValues;