ArrayList Class « ArrayList « List « Collections

Constructor Summary

ArrayList()	Creates an empty list with an initial capacity of ten.
ArrayList(Collection<? extends E> c)	Creates a list containing the elements of the specified collection, in the order they are returned by the collection's iterator.
ArrayList(int initialCapacity)	Creates an empty list with the specified initial capacity.

Add to ArrayList

Return	Method	Summary
boolean	add(E e)	Appends the specified element to the end of this list.
void	add(int index, E element)	Inserts the specified element at the specified position in this list.
boolean	addAll(Collection<? extends E> c)	Appends all of the elements in the specified collection to the end of this list, in the order that they are returned by the specified collection's Iterator.
boolean	addAll(int index, Collection<? extends E> c)	Inserts all of the elements in the specified collection into this list, starting at the specified position.

Clear an ArrayList

Return	Method	Summary
void	clear()	Removes all of the elements from this list.

Shallow copy of current ArrayList

Return	Method	Summary
Object	clone()	Returns a shallow copy of this ArrayList instance.

If contain a certain object

Return	Method	Summary
boolean	contains(Object o)	Returns true if this list contains the specified element.

Increases the capacity of an ArrayList

Return	Method	Summary
void	ensureCapacity(int minCapacity)	Increases the capacity of this ArrayList instance, if necessary, to ensure that it can hold at least the number of elements specified by the minimum capacity argument.

Get element by index

Return	Method	Summary
E	get(int index)	Returns the element at the specified position in this list.

Get object for index

Return	Method	Summary
int	indexOf(Object o)	Returns the index of the first occurrence of the specified element in this list, or -1 if this list does not contain the element.
int	lastIndexOf(Object o)	Returns the index of the last occurrence of the specified element in this list, or -1 if this list does not contain the element.

Remove from ArrayList

Return	Method	Summary
E	remove(int index)	Removes the element at the specified position in this list.
boolean	remove(Object o)	Removes the first occurrence of the specified element from this list, if it is present.

Replace element at index

Return	Method	Summary
E	set(int index, E element)	Replaces the element at the specified position in this list with the specified element.

Get the size and trim to size

Return	Method	Summary
int	size()	Returns the number of elements in this list.
void	trimToSize()	Trims the capacity of this ArrayList instance to be the list's current size.

If ArrayList is empty

Return	Method	Summary
boolean	isEmpty()	Returns true if this list contains no elements.

Convert ArrayList to array

Return	Method	Summary
Object[]	toArray()	Returns an array containing all of the elements in this list in proper sequence (from first to last element).
<T> T[]	toArray(T[] a)	Returns an array containing all of the elements in this list in proper sequence (from first to last element); the runtime type of the returned array is that of the specified array.