Java java.util Collections fields, constructors, methods, implement or subclass

Introduction

In this page you can find the methods, fields and constructors for java.util Collections.

The text is from its open source code.

Field

Set	EMPTY_SET The empty set (immutable).
List	EMPTY_LIST The empty list (immutable).
Map	EMPTY_MAP The empty map (immutable).

Method

boolean	addAll(Collection c, T... elements) Adds all of the specified elements to the specified collection.
Queue	asLifoQueue(Deque deque) Returns a view of a Deque as a Last-in-first-out (Lifo) Queue .
int	binarySearch(List> list, T key) Searches the specified list for the specified object using the binary search algorithm.
int	binarySearch(List list, T key, Comparator c) Searches the specified list for the specified object using the binary search algorithm.
Collection	checkedCollection(Collection c, Class type) Returns a dynamically typesafe view of the specified collection.
List	checkedList(List list, Class type) Returns a dynamically typesafe view of the specified list.
Map	checkedMap(Map m, Class keyType, Class valueType) Returns a dynamically typesafe view of the specified map.
Set	checkedSet(Set s, Class type) Returns a dynamically typesafe view of the specified set.
SortedMap	checkedSortedMap(SortedMap m, Class keyType, Class valueType) Returns a dynamically typesafe view of the specified sorted map.
SortedSet	checkedSortedSet(SortedSet s, Class type) Returns a dynamically typesafe view of the specified sorted set.
void	copy(List dest, List src) Copies all of the elements from one list into another.
boolean	disjoint(Collection c1, Collection c2) Returns true if the two specified collections have no elements in common.
Enumeration	emptyEnumeration() Returns an enumeration that has no elements.
Iterator	emptyIterator() Returns an iterator that has no elements.
List	emptyList() Returns an empty list (immutable).
ListIterator	emptyListIterator() Returns a list iterator that has no elements.
Map	emptyMap() Returns an empty map (immutable).
NavigableSet	emptyNavigableSet() Returns an empty navigable set (immutable).
Set	emptySet() Returns an empty set (immutable).
SortedMap	emptySortedMap() Returns an empty sorted map (immutable).
SortedSet	emptySortedSet() Returns an empty sorted set (immutable).
Enumeration	enumeration(final Collection c) Returns an enumeration over the specified collection.
void	fill(List list, T obj) Replaces all of the elements of the specified list with the specified element.
int	frequency(Collection c, Object o) Returns the number of elements in the specified collection equal to the specified object.
int	indexOfSubList(List source, List target) Returns the starting position of the first occurrence of the specified target list within the specified source list, or -1 if there is no such occurrence.
int	lastIndexOfSubList(List source, List target) Returns the starting position of the last occurrence of the specified target list within the specified source list, or -1 if there is no such occurrence.
ArrayList	list(Enumeration e) Returns an array list containing the elements returned by the specified enumeration in the order they are returned by the enumeration.
T	max(Collection coll) Returns the maximum element of the given collection, according to the natural ordering of its elements.
T	max(Collection coll, Comparator comp) Returns the maximum element of the given collection, according to the order induced by the specified comparator.
T	min(Collection coll) Returns the minimum element of the given collection, according to the natural ordering of its elements.
T	min(Collection coll, Comparator comp) Returns the minimum element of the given collection, according to the order induced by the specified comparator.
List	nCopies(int n, T o) Returns an immutable list consisting of n copies of the specified object.
Set	newSetFromMap(Map map) Returns a set backed by the specified map.
boolean	replaceAll(List list, T oldVal, T newVal) Replaces all occurrences of one specified value in a list with another.
void	reverse(List list) Reverses the order of the elements in the specified list. This method runs in linear time.
Comparator	reverseOrder() Returns a comparator that imposes the reverse of the natural ordering on a collection of objects that implement the Comparable interface.
Comparator	reverseOrder(Comparator cmp) Returns a comparator that imposes the reverse ordering of the specified comparator.
void	rotate(List list, int distance) Rotates the elements in the specified list by the specified distance.
void	shuffle(List list) Randomly permutes the specified list using a default source of randomness.
void	shuffle(List list, Random rnd) Randomly permute the specified list using the specified source of randomness.
Set	singleton(T o) Returns an immutable set containing only the specified object.
List	singletonList(T o) Returns an immutable list containing only the specified object.
Map	singletonMap(K key, V value) Returns an immutable map, mapping only the specified key to the specified value.
void	sort(List list) Sorts the specified list into ascending order, according to the Comparable natural ordering of its elements.
void	sort(List list, Comparator c) Sorts the specified list according to the order induced by the specified comparator.
void	swap(List list, int i, int j) Swaps the elements at the specified positions in the specified list.
void	swap(Object[] arr, int i, int j) Swaps the two specified elements in the specified array.
Collection	synchronizedCollection(Collection c) Returns a synchronized (thread-safe) collection backed by the specified collection.
List	synchronizedList(List list) Returns a synchronized (thread-safe) list backed by the specified list.
Map	synchronizedMap(Map m) Returns a synchronized (thread-safe) map backed by the specified map.
NavigableSet	synchronizedNavigableSet(NavigableSet s) Returns a synchronized (thread-safe) navigable set backed by the specified navigable set.
Set	synchronizedSet(Set s) Returns a synchronized (thread-safe) set backed by the specified set.
SortedMap	synchronizedSortedMap(SortedMap m) Returns a synchronized (thread-safe) sorted map backed by the specified sorted map.
SortedSet	synchronizedSortedSet(SortedSet s) Returns a synchronized (thread-safe) sorted set backed by the specified sorted set.
Collection	unmodifiableCollection(Collection c) Returns an unmodifiable view of the specified collection.
List	unmodifiableList(List list) Returns an unmodifiable view of the specified list.
Map	unmodifiableMap(Map m) Returns an unmodifiable view of the specified map.
NavigableMap	unmodifiableNavigableMap(NavigableMap m) Returns an unmodifiable view of the specified navigable map.
NavigableSet	unmodifiableNavigableSet(NavigableSet s) Returns an unmodifiable view of the specified navigable set.
Set	unmodifiableSet(Set s) Returns an unmodifiable view of the specified set.
SortedMap	unmodifiableSortedMap(SortedMap m) Returns an unmodifiable view of the specified sorted map.
SortedSet	unmodifiableSortedSet(SortedSet s) Returns an unmodifiable view of the specified sorted set.