class ArrayList<E> in Java

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class ArrayList in Java

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обновлено: 17 Augusta 2026

class ArrayList<E> implements interface List<E>

ArrayList this is an array in which you can add and remove elements.

In ArrayList any element can be gotten by integer index.

ArrayList is not synchronized. If multiple threads access a ArrayList concurrently, and at least one of the threads modifies the ArrayList, then ArrayList must be synchronized. Usually this is synchronization, it is done like this:

List myList1 = Collections.synchronizedList( new ArrayList(...) );

Java

class ArrayList<E> extends AbstractList<E> implements List<E>, RandomAccess, Cloneable, Serializable
{
     // Constructors
     ArrayList()
     ArrayList(Collection<? extends E> c)
     ArrayList(int initialCapacity)

     // Methods
     boolean add(E e)
     void add(int index, E element)
     boolean addAll(Collection<? extends E> c)
     boolean addAll(int index, Collection<? extends E> c)
     void clear()
     Object clone()
     boolean contains(Object o)
     void ensureCapacity(int minCapacity)
     void forEach(Consumer<? super E> action)
     E get(int index)
     int indexOf(Object o)
     boolean isEmpty()
     Iterator<E> iterator()
     int lastIndexOf(Object o)
     ListIterator<E> listIterator()
     ListIterator<E> listIterator(int index)
     E remove(int index)
     boolean remove(Object o)
     boolean removeAll(Collection<?> c)
     boolean removeIf(Predicate<? super E> filter)
     void removeRange(int fromIndex, int toIndex)
     void replaceAll(UnaryOperator<E> operator)
     boolean retainAll(Collection<?> c)
     E set(int index, E element)
     int size()
     void sort(Comparator<? super E> c)
     Spliterator<E> spliterator()
     List<E> subList(int fromIndex, int toIndex)
     Object[] toArray()
     <T> T[] toArray(T[] a)
     void trimToSize()

     // Methods inherited from class java.util.AbstractList
     boolean equals(Object o)
     int hashCode()

     // Methods inherited from class java.util.AbstractCollection
     boolean containsAll(Collection<?> c)
     String toString()

     // Methods inherited from class java.lang.Object
     void finalize()
     Class<?> getClass()
     void notify()
     void notifyAll()
     void wait()
     void wait(long timeout)
     void wait(long timeout, int nanos)

     // Methods inherited from interface java.util.List
     boolean containsAll(Collection<?> c)
     boolean equals(Object o)
     int hashCode()

     // Methods inherited from interface java.util.Collection
     Stream<E> parallelStream()
     Stream<E> stream()
}

Learn more about methods in the Java documentation:https://docs.oracle.com ...

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