void add(int index, E element)
Inserts the specified element at the specified position in this list.
boolean add(E e)
Appends the specified element to the end of this list.
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.
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.
int addAllAbsent(Collection<? extends E> c)
Appends all of the elements in the specified collection that are not already contained in this list, to the end of this list, in the order that they are returned by the specified collection's iterator.
boolean addIfAbsent(E e)
Appends the element, if not present.
void clear()
Removes all of the elements from this list.
Object clone()
Returns a shallow copy of this list.
boolean contains(Object o)
Returns true if this list contains the specified element.
boolean containsAll(Collection<?> c)
Returns true if this list contains all of the elements of the specified collection.
boolean equals(Object o)
Compares the specified object with this list for equality.
void forEach(Consumer<? super E> action)
Performs the given action for each element of the Iterable until all elements have been processed or the action throws an exception.
E get(int index)
Returns the element at the specified position in this list.
int hashCode()
Returns the hash code value for this list.
int indexOf(E e, int index)
Returns the index of the first occurrence of the specified element in this list, searching forwards from index, or returns -1 if the element is not found.
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.
boolean isEmpty()
Returns true if this list contains no elements.
Iterator<E> iterator()
Returns an iterator over the elements in this list in proper sequence.
int lastIndexOf(E e, int index)
Returns the index of the last occurrence of the specified element in this list, searching backwards from index, or returns -1 if the element is not found.
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.
ListIterator<E> listIterator()
Returns a list iterator over the elements in this list (in proper sequence).
ListIterator<E> listIterator(int index)
Returns a list iterator over the elements in this list (in proper sequence), starting at the specified position in the list.
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.
boolean removeAll(Collection<?> c)
Removes from this list all of its elements that are contained in the specified collection.
boolean removeIf(Predicate<? super E> filter)
Removes all of the elements of this collection that satisfy the given predicate.
void replaceAll(UnaryOperator<E> operator)
Replaces each element of this list with the result of applying the operator to that element.
boolean retainAll(Collection<?> c)
Retains only the elements in this list that are contained in the specified collection.
E set(int index, E element)
Replaces the element at the specified position in this list with the specified element.
int size()
Returns the number of elements in this list.
void sort(Comparator<? super E> c)
Sorts this list according to the order induced by the specified
Comparator
.
Spliterator<E> spliterator()
Returns a
Spliterator
over the elements in this list.
List<E> subList(int fromIndex, int toIndex)
Returns a view of the portion of this list between fromIndex, inclusive, and toIndex, exclusive.
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.
String toString()
Returns a string representation of this list.
parallelStream, streampublic CopyOnWriteArrayList()
Creates an empty list.
public CopyOnWriteArrayList(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.
c - the collection of initially held elements
NullPointerException - if the specified collection is null
public CopyOnWriteArrayList(E[] toCopyIn)
Creates a list holding a copy of the given array.
toCopyIn - the array (a copy of this array is used as the internal array)
NullPointerException - if the specified array is null
public int size()
Returns the number of elements in this list.
public boolean isEmpty()
Returns true if this list contains no elements.
public boolean contains(Object o)
Returns true if this list contains the specified element. More formally, returns true if and only if this list contains at least one element e such that Objects.equals(o, e).
public 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. More formally, returns the lowest index i such that Objects.equals(o, get(i)), or -1 if there is no such index.
public int indexOf(E e, int index)
Returns the index of the first occurrence of the specified element in this list, searching forwards from index, or returns -1 if the element is not found. More formally, returns the lowest index i such that i >= index && Objects.equals(get(i), e), or -1 if there is no such index.
e - element to search for
index - index to start searching from
index or later in the list; -1 if the element is not found.
IndexOutOfBoundsException - if the specified index is negative
public 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. More formally, returns the highest index i such that Objects.equals(o, get(i)), or -1 if there is no such index.
lastIndexOf in interface List<E>
o - element to search for
public int lastIndexOf(E e, int index)
Returns the index of the last occurrence of the specified element in this list, searching backwards from index, or returns -1 if the element is not found. More formally, returns the highest index i such that i <= index && Objects.equals(get(i), e), or -1 if there is no such index.
e - element to search for
index - index to start searching backwards from
index in this list; -1 if the element is not found.
IndexOutOfBoundsException - if the specified index is greater than or equal to the current size of this list
public Object clone()
Returns a shallow copy of this list. (The elements themselves are not copied.)
public Object[] toArray()
Returns an array containing all of the elements in this list in proper sequence (from first to last element).
The returned array will be "safe" in that no references to it are maintained by this list. (In other words, this method must allocate a new array). The caller is thus free to modify the returned array.
This method acts as bridge between array-based and collection-based APIs.
toArray in interface Collection<E>
toArray in interface List<E>
Arrays.asList(Object[])
public <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. If the list fits in the specified array, it is returned therein. Otherwise, a new array is allocated with the runtime type of the specified array and the size of this list.
If this list fits in the specified array with room to spare (i.e., the array has more elements than this list), the element in the array immediately following the end of the list is set to null. (This is useful in determining the length of this list only if the caller knows that this list does not contain any null elements.)
Like the toArray() method, this method acts as bridge between array-based and collection-based APIs. Further, this method allows precise control over the runtime type of the output array, and may, under certain circumstances, be used to save allocation costs.
Suppose x is a list known to contain only strings. The following code can be used to dump the list into a newly allocated array of String:
String[] y = x.toArray(new String[0]);
Note that
toArray(new Object[0])
is identical in function to
toArray()
.
toArray in interface Collection<E>
toArray in interface List<E>
T - the runtime type of the array to contain the collection
a - the array into which the elements of the list are to be stored, if it is big enough; otherwise, a new array of the same runtime type is allocated for this purpose.
ArrayStoreException - if the runtime type of the specified array is not a supertype of the runtime type of every element in this list
NullPointerException - if the specified array is null
public E get(int index)
Returns the element at the specified position in this list.
get in interface List<E>
index - index of the element to return
IndexOutOfBoundsException - if the index is out of range (index < 0 || index >= size())
public E set(int index, E element)
Replaces the element at the specified position in this list with the specified element.
set in interface List<E>
index - index of the element to replace
element - element to be stored at the specified position
IndexOutOfBoundsException - if the index is out of range (index < 0 || index >= size())
public boolean add(E e)
Appends the specified element to the end of this list.
add in interface Collection<E>
add in interface List<E>
e - element to be appended to this list
true (as specified by Collection.add(E))
public void add(int index,
E element)
Inserts the specified element at the specified position in this list. Shifts the element currently at that position (if any) and any subsequent elements to the right (adds one to their indices).
add in interface List<E>
index - index at which the specified element is to be inserted
element - element to be inserted
IndexOutOfBoundsException - if the index is out of range (index < 0 || index > size())
public E remove(int index)
Removes the element at the specified position in this list. Shifts any subsequent elements to the left (subtracts one from their indices). Returns the element that was removed from the list.
remove in interface List<E>
index - the index of the element to be removed
IndexOutOfBoundsException - if the index is out of range (index < 0 || index >= size())
public boolean remove(Object o)
Removes the first occurrence of the specified element from this list, if it is present. If this list does not contain the element, it is unchanged. More formally, removes the element with the lowest index i such that Objects.equals(o, get(i)) (if such an element exists). Returns true if this list contained the specified element (or equivalently, if this list changed as a result of the call).
public boolean addIfAbsent(E e)
Appends the element, if not present.
e - element to be added to this list, if absent
true if the element was added
public boolean containsAll(Collection<?> c)
Returns true if this list contains all of the elements of the specified collection.
containsAll in interface Collection<E>
containsAll in interface List<E>
c - collection to be checked for containment in this list
true if this list contains all of the elements of the specified collection
NullPointerException - if the specified collection is null
contains(Object)
public boolean removeAll(Collection<?> c)
Removes from this list all of its elements that are contained in the specified collection. This is a particularly expensive operation in this class because of the need for an internal temporary array.
removeAll in interface Collection<E>
removeAll in interface List<E>
c - collection containing elements to be removed from this list
true if this list changed as a result of the call
ClassCastException - if the class of an element of this list is incompatible with the specified collection (optional)
NullPointerException - if this list contains a null element and the specified collection does not permit null elements (optional), or if the specified collection is null
remove(Object)
public boolean retainAll(Collection<?> c)
Retains only the elements in this list that are contained in the specified collection. In other words, removes from this list all of its elements that are not contained in the specified collection.
retainAll in interface Collection<E>
retainAll in interface List<E>
c - collection containing elements to be retained in this list
true if this list changed as a result of the call
ClassCastException - if the class of an element of this list is incompatible with the specified collection (optional)
NullPointerException - if this list contains a null element and the specified collection does not permit null elements (optional), or if the specified collection is null
remove(Object)
public int addAllAbsent(Collection<? extends E> c)
Appends all of the elements in the specified collection that are not already contained in this list, to the end of this list, in the order that they are returned by the specified collection's iterator.
c - collection containing elements to be added to this list
NullPointerException - if the specified collection is null
addIfAbsent(Object)
public void clear()
Removes all of the elements from this list. The list will be empty after this call returns.
public 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.
addAll in interface Collection<E>
addAll in interface List<E>
c - collection containing elements to be added to this list
true if this list changed as a result of the call
NullPointerException - if the specified collection is null
add(Object)
public 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. Shifts the element currently at that position (if any) and any subsequent elements to the right (increases their indices). The new elements will appear in this list in the order that they are returned by the specified collection's iterator.
addAll in interface List<E>
index - index at which to insert the first element from the specified collection
c - collection containing elements to be added to this list
true if this list changed as a result of the call
IndexOutOfBoundsException - if the index is out of range (index < 0 || index > size())
NullPointerException - if the specified collection is null
add(int,Object)
public void forEach(Consumer<? super E> action)Description copied from interface:
Iterable
Performs the given action for each element of the
Iterable
until all elements have been processed or the action throws an exception. Actions are performed in the order of iteration, if that order is specified. Exceptions thrown by the action are relayed to the caller.
The behavior of this method is unspecified if the action performs side-effects that modify the underlying source of elements, unless an overriding class has specified a concurrent modification policy.
forEach in interface Iterable<E>
action - The action to be performed for each element
NullPointerException - if the specified action is null
public boolean removeIf(Predicate<? super E> filter)
Removes all of the elements of this collection that satisfy the given predicate. Errors or runtime exceptions thrown during iteration or by the predicate are relayed to the caller.
removeIf in interface Collection<E>
filter - a predicate which returns true for elements to be removed
true if any elements were removed
NullPointerException - if the specified filter is null
public void replaceAll(UnaryOperator<E> operator)Description copied from interface:
List
Replaces each element of this list with the result of applying the operator to that element. Errors or runtime exceptions thrown by the operator are relayed to the caller.
replaceAll in interface List<E>
operator - the operator to apply to each element
public void sort(Comparator<? super E> c)Description copied from interface:
List
Sorts this list according to the order induced by the specified
Comparator
.
All elements in this list must be mutually comparable using the specified comparator (that is, c.compare(e1, e2) must not throw a ClassCastException for any elements e1 and e2 in the list).
If the specified comparator is null then all elements in this list must implement the Comparable interface and the elements' natural ordering should be used.
This list must be modifiable, but need not be resizable.
sort in interface List<E>
c - the Comparator used to compare list elements. A null value indicates that the elements' natural ordering should be used
public String toString()
Returns a string representation of this list. The string representation consists of the string representations of the list's elements in the order they are returned by its iterator, enclosed in square brackets (
"[]"
). Adjacent elements are separated by the characters
", "
(comma and space). Elements are converted to strings as by
String.valueOf(Object)
.
public boolean equals(Object o)
Compares the specified object with this list for equality. Returns
true
if the specified object is the same object as this object, or if it is also a
List
and the sequence of elements returned by an
iteratorover the specified list is the same as the sequence returned by an iterator over this list. The two sequences are considered to be the same if they have the same length and corresponding elements at the same position in the sequence are
equal. Two elements
e1
and
e2
are considered
equalif
Objects.equals(e1, e2)
.
equals in interface Collection<E>
equals in interface List<E>
equals in class Object
o - the object to be compared for equality with this list
true if the specified object is equal to this list
Object.hashCode(), HashMap
public int hashCode()
This implementation uses the definition in List.hashCode().
hashCode in interface Collection<E>
hashCode in interface List<E>
hashCode in class Object
Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)
public Iterator<E> iterator()
The returned iterator provides a snapshot of the state of the list when the iterator was constructed. No synchronization is needed while traversing the iterator. The iterator does NOT support the remove method.
public ListIterator<E> listIterator()
The returned iterator provides a snapshot of the state of the list when the iterator was constructed. No synchronization is needed while traversing the iterator. The iterator does NOT support the remove, set or add methods.
listIterator in interface List<E>
public ListIterator<E> listIterator(int index)
Returns a list iterator over the elements in this list (in proper sequence), starting at the specified position in the list. The specified index indicates the first element that would be returned by an initial call to
next
. An initial call to
previous
would return the element with the specified index minus one.
The returned iterator provides a snapshot of the state of the list when the iterator was constructed. No synchronization is needed while traversing the iterator. The iterator does NOT support the remove, set or add methods.
listIterator in interface List<E>
index - index of the first element to be returned from the list iterator (by a call to next)
IndexOutOfBoundsException - if the index is out of range (index < 0 || index > size())
public Spliterator<E> spliterator()
spliterator in interface Collection<E>
spliterator in interface Iterable<E>
spliterator in interface List<E>
Spliterator over the elements in this list
public List<E> subList(int fromIndex, int toIndex)
Returns a view of the portion of this list between
fromIndex
, inclusive, and
toIndex
, exclusive. The returned list is backed by this list, so changes in the returned list are reflected in this list.
The semantics of the list returned by this method become undefined if the backing list (i.e., this list) is modified in any way other than via the returned list.
subList in interface List<E>
fromIndex - low endpoint (inclusive) of the subList
toIndex - high endpoint (exclusive) of the subList
IndexOutOfBoundsException - for an illegal endpoint index value (fromIndex < 0 || toIndex > size || fromIndex > toIndex)
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