Summary: Methods | Inherited Methods | [Expand All]

public interface

Collection

implements Iterable<T>

java.util.Collection<E>

Known Indirect Subclasses

AbstractCollection<E>, AbstractList<E>, AbstractQueue<E>, AbstractSequentialList<E>, AbstractSet<E>, ArrayBlockingQueue<E>, ArrayList<E>, BlockingQueue<E>, ConcurrentLinkedQueue<E>, CopyOnWriteArrayList<E>, CopyOnWriteArraySet<E>, DelayQueue<E extends Delayed>, EnumSet<E extends Enum<E>>, HashSet<E>, LinkedBlockingQueue<E>, LinkedHashSet<E>, LinkedList<E>, List<E>, PriorityBlockingQueue<E>, PriorityQueue<E>, Queue<E>, Set<E>, SortedSet<E>, Stack<E>, SynchronousQueue<E>, TreeSet<E>, Vector<E>

AbstractCollection<E>	AbstractCollection is an abstract implementation of the Collection interface.
AbstractList<E>	AbstractList is an abstract implementation of the List interface, optimized for a backing store which supports random access.
AbstractQueue<E>	An abstract class which gives out skeletal implementations for some methods in Queue which include add, remove, and element that are based on offer, poll, and peek except that they throw exception to indicate the occurrence of some error instead of the return value of false or null.
AbstractSequentialList<E>	AbstractSequentialList is an abstract implementation of the List interface.
AbstractSet<E>	AbstractSet is an abstract implementation of the Set interface.
ArrayBlockingQueue<E>	A bounded blocking queue backed by an array.
ArrayList<E>	ArrayList is an implementation of List, backed by an array.
BlockingQueue<E>	A Queue that additionally supports operations that wait for the queue to become non-empty when retrieving an element, and wait for space to become available in the queue when storing an element.
ConcurrentLinkedQueue<E>	An unbounded thread-safe queue based on linked nodes.
CopyOnWriteArrayList<E>	Implements a ArrayList variant that is thread-safe.
CopyOnWriteArraySet<E>	A Set that uses CopyOnWriteArrayList for all of its operations.
DelayQueue<E extends Delayed>	An unbounded blocking queue of `Delayed` elements, in which an element can only be taken when its delay has expired.
EnumSet<E extends Enum<E>>
HashSet<E>	HashSet is an implementation of Set.
LinkedBlockingQueue<E>	An optionally-bounded blocking queue based on linked nodes.
LinkedHashSet<E>	LinkedHashSet is a variant on HashSet.
LinkedList<E>	LinkedList is an implementation of List, backed by a linked list.
List<E>	List is a collection which maintains an ordering for its elements.
PriorityBlockingQueue<E>	An unbounded blocking queue that uses the same ordering rules as class PriorityQueue and supplies blocking retrieval operations.
PriorityQueue<E>	PriorityQueue holds elements on a priority heap, which orders elements according to the comparator specified at construction or their natural order.
Queue<E>	A kind of collection provides advanced operations than other basic collections, such as insertion, extraction, and inspection.
Set<E>	Set is a collection which does not allow duplicate elements.
SortedSet<E>	SortedSet is a Set which iterates its elements in sorted order.
Stack<E>	`Stack` is a Last-In/First-Out(LIFO) data structure which represents a stack of objects.
SynchronousQueue<E>	A blocking queue in which each `put` must wait for a `take`, and vice versa.
TreeSet<E>	TreeSet is an implementation of SortedSet.
Vector<E>	Vector is a variable size contiguous indexable array of Objects.

Class Overview

Collection is the root of the collection hierarchy.

Summary

Public Methods
abstract boolean	add(E object) Attempts to add `object` to the contents of this `Collection`.
abstract boolean	addAll(Collection<? extends E> collection) Attempts to add all of the objects contained in `collection` to the contents of this collection.
abstract void	clear() Removes all elements from this Collection, leaving it empty.
abstract boolean	contains(Object object) Searches this Collection for the specified object.
abstract boolean	containsAll(Collection<?> collection) Searches this Collection for all objects in the specified Collection.
abstract boolean	equals(Object object) Compares the argument to the receiver, and returns true if they represent the same object using a class specific comparison.
abstract int	hashCode() Returns an integer hash code for the receiver.
abstract boolean	isEmpty() Returns if this Collection has no elements, a size of zero.
abstract Iterator<E>	iterator() Returns an instance of Iterator that may be used to access the objects contained by this collection.
abstract boolean	remove(Object object) Removes the first occurrence of the specified object from this Collection.
abstract boolean	removeAll(Collection<?> collection) Removes all occurrences in this Collection of each object in the specified Collection.
abstract boolean	retainAll(Collection<?> collection) Removes all objects from this Collection that are not also found in the contents of `collection`.
abstract int	size() Returns a count of how many objects are contained by this collection.
abstract <T> T[]	toArray(T[] array) Returns an array containing all elements contained in this Collection.
abstract Object[]	toArray() Returns a new array containing all elements contained in this Collection.

[Expand]

Inherited Methods

From interface java.lang.Iterable

Public Methods

public abstract boolean add (E object)

Attempts to add object to the contents of this Collection.

Parameters

object	the object to add

Returns

true if this Collection is modified, false otherwise

Throws

UnsupportedOperationException	when adding to this Collection is not supported
ClassCastException	when the class of the object is inappropriate for this Collection
IllegalArgumentException	when the object cannot be added to this Collection

public abstract boolean addAll (Collection<? extends E> collection)

Attempts to add all of the objects contained in collection to the contents of this collection.

Parameters

collection	the Collection of objects

Returns

true if this Collection is modified, false otherwise

Throws

UnsupportedOperationException	when adding to this Collection is not supported
ClassCastException	when the class of an object is inappropriate for this Collection
IllegalArgumentException	when an object cannot be added to this Collection

public abstract void clear ()

Removes all elements from this Collection, leaving it empty.

Throws

UnsupportedOperationException	when removing from this Collection is not supported

public abstract boolean contains (Object object)

Searches this Collection for the specified object.

Parameters

object	the object to search for

Returns

true if object is an element of this Collection, false otherwise

public abstract boolean containsAll (Collection<?> collection)

Searches this Collection for all objects in the specified Collection.

Parameters

collection	the Collection of objects

Returns

true if all objects in the specified Collection are elements of this Collection, false otherwise

public abstract boolean equals (Object object)

Compares the argument to the receiver, and returns true if they represent the same object using a class specific comparison.

Parameters

object	Object the object to compare with this object.

Returns

boolean true if the object is the same as this object false if it is different from this object.

public abstract int hashCode ()

Returns an integer hash code for the receiver. Objects which are equal answer the same value for this method.

Returns

the receiver's hash

public abstract boolean isEmpty ()

Returns if this Collection has no elements, a size of zero.

Returns

true if this Collection has no elements, false otherwise

public abstract Iterator<E> iterator ()

Returns an instance of Iterator that may be used to access the objects contained by this collection.

Returns

an iterator for accessing the collection contents

public abstract boolean remove (Object object)

Removes the first occurrence of the specified object from this Collection.

Parameters

object	the object to remove

Returns

true if this Collection is modified, false otherwise

Throws

UnsupportedOperationException	when removing from this Collection is not supported

public abstract boolean removeAll (Collection<?> collection)

Removes all occurrences in this Collection of each object in the specified Collection.

Parameters

collection	the Collection of objects to remove

Returns

true if this Collection is modified, false otherwise

Throws

UnsupportedOperationException	when removing from this Collection is not supported

public abstract boolean retainAll (Collection<?> collection)

Removes all objects from this Collection that are not also found in the contents of collection.

Parameters

collection	the Collection of objects to retain

Returns

true if this Collection is modified, false otherwise

Throws

UnsupportedOperationException	when removing from this Collection is not supported

public abstract int size ()

Returns a count of how many objects are contained by this collection.

Returns

how many objects are contained by this collection

public abstract T[] toArray (T[] array)

Returns an array containing all elements contained in this Collection. If the specified array is large enough to hold the elements, the specified array is used, otherwise an array of the same type is created. If the specified array is used and is larger than this Collection, the array element following the collection elements is set to null.

Parameters

array	the array

Returns

an array of the elements from this Collection

Throws

ArrayStoreException	when the type of an element in this Collection cannot be stored in the type of the specified array

public abstract Object[] toArray ()

Returns a new array containing all elements contained in this Collection.

Returns

an array of the elements from this Collection

Mar	APR	May
	20
2008	2009	2010

Interfaces

Classes

Enums

Exceptions

Collection

Class Overview

Summary

Public Methods

public abstract boolean add (E object)

Parameters

Returns

Throws

public abstract boolean addAll (Collection<? extends E> collection)

Parameters

Returns

Throws

public abstract void clear ()

Throws

See Also

public abstract boolean contains (Object object)

Parameters

Returns

public abstract boolean containsAll (Collection<?> collection)

Parameters

Returns

public abstract boolean equals (Object object)

Parameters

Returns

See Also

public abstract int hashCode ()

Returns

See Also

public abstract boolean isEmpty ()

Returns

See Also

public abstract Iterator<E> iterator ()

Returns

public abstract boolean remove (Object object)

Parameters

Returns

Throws

public abstract boolean removeAll (Collection<?> collection)

Parameters

Returns

Throws

public abstract boolean retainAll (Collection<?> collection)

Parameters

Returns

Throws

public abstract int size ()

Returns

public abstract T[] toArray (T[] array)

Parameters

Returns

Throws

public abstract Object[] toArray ()

Returns