Java Utililty Methods Collection Element Get

List of utility methods to do Collection Element Get

  1. HOME
  2. Java
  3. C
  4. Collection Element Get

Description

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

Method

StringgetCollectionClosingSymbol(Collection col)
get Collection Closing Symbol 
if (col instanceof List) {
    return "]";
if (col instanceof Set) {
    return "}";
return ")";
StringgetCollectionPreview(final Collection collection, int previewSize)
Generates a string that enumerates just the first elements of a collection (a preview). 
final Iterator<?> it = collection.iterator();
final StringBuilder buffer = new StringBuilder();
if (it.hasNext()) {
    buffer.append('[').append(it.next().toString());
    for (; previewSize > 0 && it.hasNext(); --previewSize)
        buffer.append(LIST_SEPARATOR).append(' ').append(it.next().toString());
    if (it.hasNext())
        buffer.append(" ... ");
...
intgetCollectionSize(Collection collection)
return collection size 
return collection != null ? collection.size() : 0;
intgetCollectionSize(Collection collection)
Returns size of the incoming list 
if (collection == null)
    return 0;
else
    return collection.size();
StringgetCommaDelimitedString(Collection elements)
Transforms a collection of Integers into a comma delimited String. 
final StringBuilder builder = new StringBuilder();
if (elements != null && !elements.isEmpty()) {
    for (Object element : elements) {
        builder.append(element.toString()).append(DELIMITER);
    return builder.substring(0, builder.length() - DELIMITER.length());
return builder.toString();
...
StringgetCommaSeparatedString(Collection collection)
get Comma Separated String 
StringBuffer buffer = new StringBuffer();
Iterator<? extends Object> iterator = collection.iterator();
while (iterator.hasNext()) {
    Object obj = iterator.next();
    buffer.append(obj.toString());
    if (iterator.hasNext()) {
        buffer.append(", ");
return buffer.toString();
StringgetCommaSeparatedString(Collection values)
get Comma Separated String 
if (values == null || values.size() == 0) {
    return null;
StringBuilder builder = new StringBuilder();
for (String value : values) {
    builder.append(value);
    builder.append(COMMA);
return builder.substring(0, builder.length() - 1);
StringgetCommaSeparatedStringFromCollection(Collection collections)
get Comma Separated String From Collection 
StringBuilder result = new StringBuilder();
if (collections != null) {
    Object[] array = collections.toArray();
    for (int i = 0; i < array.length; i++) {
        result.append(array[i]);
        if (i < array.length - 1) {
            result.append(',');
return result.toString();
CollectiongetCommon(Collection c1, Collection c2)
get Common objects between two collections 
Iterator iterator = c1.iterator();
while (iterator.hasNext()) {
    Object o1 = iterator.next();
    if (!c2.contains(o1))
        iterator.remove();
return c1;
ListgetCommonElements(Collection from, Collection to)
get Common Elements 
List<E> res = new ArrayList<E>();
for (E f : from) {
    for (E t : to) {
        if (f.equals(t)) {
            res.add(f);
return res;