Java Utililty Methods Collection First

List of utility methods to do Collection First

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Description

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

Method

EfirstNonNull(Collection collection)
first Non Null 
return firstNonNull(collection, null);
TfirstOrThat(Collection collection, T that)
first Or That 
if (collection == null || collection.size() == 0) {
    return that;
return collection.iterator().next();
TfirstValue(Class type, Collection values)
first Value 
final T value = findFirstValue(type, values);
if (null != value) {
    return value;
throw new IllegalStateException("Expecting at least one value");
ObjectGET_FIRST_ELEMENT(Collection coll)
Returns the first element of the given collection. 
Object ret = null;
if (coll.size() > 0) {
    Object[] ar = new Object[coll.size()];
    ar = coll.toArray(ar);
    for (int i = 0; i < ar.length; i++) {
        if ((ar[i] != null)) {
            ret = ar[i];
            break;
...
TgetCollectionFirstElement(final Collection collection)
Gets the first element of a collection, if it exist. 
T result = null;
if (collection.isEmpty() == false) {
    result = new ArrayList<T>(collection).get(0);
return result;
ObjectgetFirst(Collection c)
Returns the first element in a collection (according to its iterator). 
return c.iterator().next();
ObjectgetFirst(Collection c)
get First 
if (c == null || c.isEmpty()) {
    return null;
return c.iterator().next();
StringgetFirst(Collection collection)
Utility function to get a sample item from a collection 
Iterator<String> it = collection.iterator();
if (it.hasNext()) {
    return it.next();
return null;
TgetFirst(Collection bag)
get First 
if (bag.isEmpty())
    return null;
if (bag instanceof java.util.List) {
    return ((List<T>) bag).get(0);
} else {
    return bag.iterator().next();
TgetFirst(Collection c)
get First 
return getFirst(c.iterator());