Java Utililty Methods Collection Create

List of utility methods to do Collection Create

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Description

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

Method

StringcreateTextFromList(Collection list)
create Text From List 
if (list.isEmpty())
    return "";
StringBuilder htmlList = new StringBuilder();
for (String listItem : list) {
    htmlList.append("* ").append(listItem);
    htmlList.append("\n");
htmlList.deleteCharAt(htmlList.length() - 1);
...
StringcreateUniqueName(String baseName, Collection names)
Generate a unique name based on the given name and the name of already existing elements. 
String uniqueName = baseName;
int idx = -1;
for (String name : names) {
    if (!name.startsWith(baseName)) {
        continue;
    String suffix = name.substring(baseName.length());
    if (suffix.isEmpty()) {
...
CollectionstringToCollection(String string)
Returns a comma-delimitted list of Strings as a Collection. 
if (string == null || string.trim().length() == 0) {
    return Collections.emptyList();
Collection<String> collection = new ArrayList<String>();
StringTokenizer tokens = new StringTokenizer(string, ",");
while (tokens.hasMoreTokens()) {
    collection.add(tokens.nextToken().trim());
return collection;
CollectionstringToCollection(String string)
Returns a comma-delimitted list of Strings as a Collection. 
if (string == null || string.trim().length() == 0) {
    return Collections.emptyList();
Collection<String> collection = new ArrayList<>();
StringTokenizer tokens = new StringTokenizer(string, ",");
while (tokens.hasMoreTokens()) {
    collection.add(tokens.nextToken().trim());
return collection;
ArrayListstringToCollection(String string, String delim)
This method will return all the values in a delimited String as a Collection of String objects. 
return stringToCollection(string, delim, false);
CtoCollection(C c, E... elements)
to Collection 
if (elements != null) {
    for (E element : elements) {
        c.add(element);
return c;
CtoCollection(Class cls, Iterable iterable)
to Collection 
try {
    C result = cls.newInstance();
    for (T item : iterable) {
        result.add(item);
    return result;
} catch (InstantiationException ex) {
    return null;
...
CollectiontoCollection(Class cls, T[] array)
to Collection 
try {
    Collection<T> collection = cls.newInstance();
    for (T t : array) {
        collection.add(t);
    return collection;
} catch (RuntimeException re) {
    throw re;
...
CollectiontoCollection(final char[] charArray)
to Collection 
final Collection<String> c = new ArrayList<String>();
for (final Object obj : charArray) {
    c.add(obj.toString());
return c;
CollectiontoCollection(final Iterable iterable)
Converts an Iterable into a Collection. 
final Collection<E> col = new ArrayList<E>();
final Iterator<E> it = iterable.iterator();
while (it.hasNext()) {
    final E item = it.next();
    col.add(item);
return col;