Java org.apache.commons.collections CollectionUtils fields, constructors, methods, implement or subclass

Introduction

In this page you can find the methods, fields and constructors for org.apache.commons.collections CollectionUtils.

The text is from its open source code.

Subclass

org.apache.commons.collections.CollectionUtils has subclasses.
Click this link to see all its subclasses.

Field

Collection	EMPTY_COLLECTION An empty unmodifiable collection.

Constructor

	CollectionUtils() `CollectionUtils` should not normally be instantiated.

Method

void	addAll(Collection collection, Iterator iterator) Adds all elements in the iteration to the given collection.
void	addAll(Collection collection, Enumeration enumeration) Adds all elements in the enumeration to the given collection.
void	addAll(Collection collection, Object[] elements) Adds all elements in the array to the given collection.
boolean	addIgnoreNull(Collection collection, Object object) Adds an element to the collection unless the element is null.
int	cardinality(Object obj, final Collection coll) Returns the number of occurrences of obj in coll.
Collection	collect(Collection inputCollection, Transformer transformer) Returns a new Collection consisting of the elements of inputCollection transformed by the given transformer.
Collection	collect(Iterator inputIterator, Transformer transformer) Transforms all elements from the inputIterator with the given transformer and adds them to the outputCollection.
Collection	collect(Collection inputCollection, final Transformer transformer, final Collection outputCollection) Transforms all elements from inputCollection with the given transformer and adds them to the outputCollection.
Collection	collect(Iterator inputIterator, final Transformer transformer, final Collection outputCollection) Transforms all elements from the inputIterator with the given transformer and adds them to the outputCollection.
boolean	containsAny(final Collection coll1, final Collection coll2) Returns `true` iff at least one element is in both collections.
int	countMatches(Collection inputCollection, Predicate predicate) Counts the number of elements in the input collection that match the predicate.
Collection	disjunction(final Collection a, final Collection b) Returns a Collection containing the exclusive disjunction (symmetric difference) of the given Collection s.
boolean	exists(Collection collection, Predicate predicate) Answers true if a predicate is true for at least one element of a collection.
void	filter(Collection collection, Predicate predicate) Filter the collection by applying a Predicate to each element.
Object	find(Collection collection, Predicate predicate) Finds the first element in the given collection which matches the given predicate.
void	forAllDo(Collection collection, Closure closure) Executes the given closure on each element in the collection.
Object	get(Object object, int index) Returns the `index`-th value in `object`, throwing `IndexOutOfBoundsException` if there is no such element or `IllegalArgumentException` if `object` is not an instance of one of the supported types.
Map	getCardinalityMap(final Collection coll) Returns a Map mapping each unique element in the given Collection to an Integer representing the number of occurrences of that element in the Collection .
Collection	intersection(final Collection a, final Collection b) Returns a Collection containing the intersection of the given Collection s.
boolean	isEqualCollection(final Collection a, final Collection b) Returns `true` iff the given Collection s contain exactly the same elements with exactly the same cardinalities.
boolean	isSubCollection(final Collection a, final Collection b) Returns `true` iff a is a sub-collection of b, that is, iff the cardinality of e in a is less than or equal to the cardinality of e in b, for each element e in a.
Collection	predicatedCollection(Collection collection, Predicate predicate) Returns a predicated (validating) collection backed by the given collection.
Collection	removeAll(Collection collection, Collection remove) Removes the elements in `remove` from `collection`.
Collection	retainAll(Collection collection, Collection retain) Returns a collection containing all the elements in `collection` that are also in `retain`.
void	reverseArray(Object[] array) Reverses the order of the given array.
Collection	select(Collection inputCollection, Predicate predicate) Selects all elements from input collection which match the given predicate into an output collection.
void	select(Collection inputCollection, Predicate predicate, Collection outputCollection) Selects all elements from input collection which match the given predicate and adds them to outputCollection.
Collection	selectRejected(Collection inputCollection, Predicate predicate) Selects all elements from inputCollection which don't match the given predicate into an output collection.
void	selectRejected(Collection inputCollection, Predicate predicate, Collection outputCollection) Selects all elements from inputCollection which don't match the given predicate and adds them to outputCollection.
int	size(Object object) Gets the size of the collection/iterator specified.
Collection	subtract(final Collection a, final Collection b) Returns a new Collection containing `a - b`.
void	transform(Collection collection, Transformer transformer) Transform the collection by applying a Transformer to each element.
Collection	transformedCollection(Collection collection, Transformer transformer) Returns a transformed bag backed by the given collection.
Collection	typedCollection(Collection collection, Class type) Returns a typed collection backed by the given collection.
Collection	union(final Collection a, final Collection b) Returns a Collection containing the union of the given Collection s.
Collection	unmodifiableCollection(Collection collection) Returns an unmodifiable collection backed by the given collection.