Java Utililty Methods Collection Search

List of utility methods to do Collection Search

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Description

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

Method

TgetSingle(Collection configs)
get Single 
if (configs.size() == 1) {
    for (T t : configs) {
        return t;
return null;
TgetSingleElement(Collection collection)
get Single Element 
isEmptyException(collection);
return collection.iterator().next();
TgetSingleElement(Collection collection)
Returns the single element contained by the input collection 
if (collection.size() != 1)
    throw new IndexOutOfBoundsException(
            String.format("Expected collection to contain a single element, but observed %d elements: %s",
                    collection.size(), collection.toString()));
return collection.iterator().next();
TgetSingleItem(Collection values)
get Single Item 
assert values.size() == 1;
if (values instanceof List) {
    return ((List<T>) values).get(0);
} else {
    return (T) values.toArray()[0];
RgetSingleValue(Iterable collection)
get Single Value 
return getSingleValue(collection, "Single value expected");
booleanhasElements(Collection c)
has Elements 
return !isEmpty(c);
booleanhasElements(Collection c)
has Elements 
return c != null && !c.isEmpty();
booleanhasElements(Collection collection)
Checks whether the COLLECTION is not NULL and has at least one element. 
return (null != collection && collection.size() > 0);
booleanhasElements(Collection t)
has Elements 
return (t != null) && (t.size() > 0);
inthashCapacityFor(Collection collection)
hash Capacity For 
return (int) Math.ceil(collection.size() / 0.75);