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Resizable-array implementation of the List interface. Implements all optional List operations, and permits all elements, including null. In addition to implementing the List interface, ArrayList provides methods to manipulate the size of the array that is used internally to store the List. (ArrayList is roughly equivalent to Vector, except that it is unsynchronized.)
The size, isEmpty, get, set, clear, iterator, and listIterator operations run in constant time. The add() operation runs in constant time unless it causes the ArrayList to exceed its capacity, in which case it runs in linear time. All of the other operations run in linear time (roughly speaking). The constant factor is low compared to that for LinkedList.
public class java.util.ArrayList
Each ArrayList has a capacity and a capacityIncrement. The capacity is the size of the array used to store the elements in the List. It is always least as large as the List size; it is usually larger because as components are added to the ArrayList, the ArrayList’s storage increases in chunks the size of its capacityIncrement. (The capacityIncrement does not change over the lifetime of the ArrayList.) An application can increase the capacity of an ArrayList before inserting a large number of components; this reduces the amount of incremental reallocation.
Note that this implementation is not synchronized. If multiple threads access an ArrayList concurrently, and least one of the threads modifies the ArrayList structurally, it must be synchronized externally. (A structural modification is any operation that adds or deletes one or more elements, or explicitly resizes the backing array; merely setting the value of an element is not a structural modification.) This is typically accomplished by synchronizing on some object that naturally encapsulates the ArrayList. If no such object exists, the ArrayList should be “wrapped” using the Collections.synchronizedSet method. This is best done creation time, to prevent accidental unsynchronized access to the ArrayList:
List list = Collections.synchronizedList(new ArrayList(…));
The Iterators returned by ArrayList’s iterator and listIterator methods are fail-fast: if the ArrayList is structurally modified any time after the Iterator is created, in any way except through the Iterator’s own remove or add methods, the Iterator will throw a ConcurrentModificationException. Thus, in the face of concurrent modification, the Iterator fails quickly and cleanly, rather than risking arbitrary, non-deterministic behavior an undetermined time in the future.
See also:Collection, List, LinkedList, Vector, Collections.synchronizedList
ArrayList()Constructs an empty ArrayList.ArrayList(Collection)Constructs an ArrayList containing the elements of the specified Collection, in the orderArrayList(int)Constructs an empty ArrayList with the specified initial capacity.ArrayList(int, int)Constructs an empty ArrayList with the specified initial capacity and capacity
add(int, A)Inserts the specified element the specified position in this ArrayListadd(A)Appends the specified element to the end of this ArrayList.addAll(int, Collection)Inserts all of the elements in the specified Collection into this ArrayList, starting addAll(Collection)Appends all of the elements in the specified Collection to the end of this thisclear()Removes all of the elements from this ArrayListclone()Returns a shallow copy of this ArrayListcontains(A)Returns true if this ArrayList contains the specified element.ensureCapacity(int)Increases the capacity of this ArrayList, if necessary, to ensure that it can hold get(int)Returns the element the specified position in this ArrayList.indexOf(A, int)Searches for the first occurence of the given argument, beginning the search indexOf(A)Searches for the first occurence of the given argument, testing for equality using theisEmpty()Tests if this ArrayList has no components.lastIndexOf(A, int)Searches backwards for the specified object, starting from the specified index, andlastIndexOf(A)Returns the index of the last occurrence of the specified object in this ArrayList.remove(int)Removes the element the specified position in this ArrayList. Shifts any subsequentremoveRange(int, int)Removes from this ArrayList all of the elements whose index is between fromIndex,set(int, A)Replaces the element the specified position in this ArrayList with the specifiedsize()Returns the number of components in this ArrayList.toArray()Returns an array containing all of the elements in this ArrayList in the correct order.trimToSize()Trims the capacity of this ArrayList to be the ArrayList’s current size
ArrayList
public ArrayList(int initialCapacity,
int capacityIncrement);
Constructs an empty ArrayList with the specified initial capacity and capacity increment.Parameters:initialCapacity – the initial capacity of the ArrayList.capacityIncrement – the amount by which the capacity is increased when the ArrayList overflows.
ArrayList
public ArrayList(int initialCapacity);
Constructs an empty ArrayList with the specified initial capacity.Parameters:initialCapacity – the initial capacity of the ArrayList.
ArrayList
public ArrayList();
Constructs an empty ArrayList.
ArrayList
public ArrayList(Collection c);
Constructs an ArrayList containing the elements of the specified Collection, in the order they are returned by the Collection’s iterator. The ArrayList has initial capacity of 110% the size of the specified Collection, and the default capacity increment.
trimToSize
public void trimToSize();
Trims the capacity of this ArrayList to be the ArrayList’s current size. An application can use this operation to minimize the storage of an ArrayList.
ensureCapacity
public void ensureCapacity(int minCapacity);
Increases the capacity of this ArrayList, if necessary, to ensure that it can hold least the number of components specified by the minimum capacity argument.Parameters:minCapacity – the desired minimum capacity.
size
public int size();
Returns the number of components in this ArrayList.Returns:the number of components in this ArrayList.Overrides:size in class AbstractCollection
isEmpty
public boolean isEmpty();
Tests if this ArrayList has no components.Returns:true if this ArrayList has no components; false otherwise.Overrides:isEmpty in class AbstractCollection
contains
public boolean contains(A elem);
Returns true if this ArrayList contains the specified element.Parameters:o – element whose presence in this List is to be tested.Overrides:contains in class AbstractCollection
indexOf
public int indexOf(A elem);
Searches for the first occurence of the given argument, testing for equality using the equals method.Parameters:elem – an object.Returns:the index of the first occurrence of the argument in this ArrayList; returns -1 if the object is not found.Overrides:indexOf in class AbstractListSee also:equals(Object)
indexOf
public int indexOf(A elem,
int index);
Searches for the first occurence of the given argument, beginning the search index, and testing for equality using the equals method.Parameters:elem – an object.index – the index to start searching from.Returns:the index of the first occurrence of the object argument in this ArrayList position index or later in the ArrayList; returns -1 if the object is not found.Overrides:indexOf in class AbstractListSee also:equals(Object)
lastIndexOf
public int lastIndexOf(A elem);
Returns the index of the last occurrence of the specified object in this ArrayList.Parameters:elem – the desired component.Returns:the index of the last occurrence of the specified object in this ArrayList; returns -1 if the object is not found.Overrides:lastIndexOf in class AbstractList
lastIndexOf
public int lastIndexOf(A elem,
int index);
Searches backwards for the specified object, starting from the specified index, and returns an index to it.Parameters:elem – the desired component.index – the index to start searching from.Returns:the index of the last occurrence of the specified object in this ArrayList position less than index in the ArrayList; -1 if the object is not found.Overrides:lastIndexOf in class AbstractList
clone
public Object clone();
Returns a shallow copy of this ArrayList. (The elements themselves are not copied.)Returns:a clone of this ArrayList.Overrides:clone in class Object
toArray
public Object[] toArray();
Returns an array containing all of the elements in this ArrayList in the correct order.Overrides:toArray in class AbstractCollection
get
public A get(int index);
Returns the element the specified position in this ArrayList.Parameters:index – index of element to return.Throws:IndexOutOfBoundsException -index is out of range (index = size()).Overrides:get in class AbstractList
set
public A set(int index,
A element);
Replaces the element the specified position in this ArrayList with the specified element.Parameters:index – index of element to replace.element – element to be stored the specified position.Returns:the element previously the specified position.Throws:IndexOutOfBoundsException -index out of range (index = size()).Overrides:set in class AbstractList
add
public boolean add(A o);
Appends the specified element to the end of this ArrayList.Parameters:o – element to be appended to this ArrayList.Returns:true (as per the general contract of Collection.add).Overrides:add in class AbstractList
add
public void add(int index,
A element);
Inserts the specified element the specified position in this ArrayList. Shifts the element currently that position (if any) and any subsequent elements to the right (adds one to their indices).Parameters:index – index which the specified element is to be inserted.element – element to be inserted.Throws:IndexOutOfBoundsException -index is out of range (index size()).Overrides:add in class AbstractList
remove
public A remove(int index);
Removes the element the specified position in this ArrayList. Shifts any subsequent elements to the left (subtracts one from their indices). Returns the element that was removed from the ArrayList.Parameters:index – the index of the element to removed.Throws:IndexOutOfBoundsException -index out of range (index = size()).Overrides:remove in class AbstractList
clear
public void clear();
Removes all of the elements from this ArrayList. The ArrayList will be empty after this call returns, unless it throws an exception.Throws:UnsupportedOperationException -clear is not supported by this Set.Overrides:clear in class AbstractCollection
addAll
public boolean addAll(Collection c);
Appends all of the elements in the specified Collection to the end of this this ArrayList, in the order that they are returned by the specified Collection’s Iterator. The behavior of this operation is undefined if the specified Collection is modified while the operation is in progress. (This implies that the behavior of this call is undefined if the the specified Collection is this ArrayList, and this ArrayList is nonempty.)Parameters:index – index which to insert first element from the specified collection.c – elements to be inserted into this ArrayList.Throws:IndexOutOfBoundsException -index out of range (index size()).Overrides:addAll in class AbstractCollection
removeRange
public void removeRange(int fromIndex,
int toIndex);
Removes from this ArrayList all of the elements whose index is between fromIndex, inclusive and toIndex, exclusive. Shifts any succeeding elements to the left (reduces their index). This call shortens the ArrayList by (toIndex – fromIndex) elements. (If toIndex==fromIndex, this operation has no effect.)Parameters:fromIndex – index of first element to be removed.fromIndex – index after last element to be removed.Throws:IndexOutOfBoundsException -fromIndex or toIndex out of range (fromIndex = size() || toIndex > size() || toIndex < fromIndex).Overrides:removeRange in class AbstractList
addAll
public boolean addAll(int index,
Collection c);
Inserts all of the elements in the specified Collection into this ArrayList, starting the specified position. Shifts the element currently that position (if any) and any subsequent elements to the right (increases their indices). The new elements will appear in the ArrayList in the order that they are returned by the specified Collection’s iterator.Parameters:index – index which to insert first element from the specified collection.c – elements to be inserted into this ArrayList.Throws:IndexOutOfBoundsException -index out of range (index size()).Overrides:addAll in class AbstractList[all packages] [package java.util] [class hierarchy] [index]java.util.ArrayList.html
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