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 class Vector in Java 
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обновлено: 19 Augusta 2026
class Vector<E>   implements interface List<E>

Vector this is an array in which you can add and remove elements.
In Vector any element can be gotten by integer index.

Vector is fully synchronized (thread-safe).

Note 1
Vector is the same as ArrayList, and the difference is that Vector is fully synchronized (thread-safe). If not need a thread-safe, it is recommended to use ArrayList because works faster.

Note 2
Vector tries to optimize storage management by maintaining parameters initialCapacity and capacityIncrement in constructor. ArrayList does not have such a constructor.
  Java  
class Vector<E> extends AbstractList<E> implements List<E>, RandomAccess, Cloneable, Serializable
{
     // Constructors
     Vector()    
     Vector(Collection<? extends E> c)    
     Vector(int initialCapacity)    
     Vector(int initialCapacity, int capacityIncrement)    

     // 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 addElement(E obj)
     int capacity()
     void clear()
     Object clone()
     boolean contains(Object o)
     boolean     containsAll(Collection<?> c)
     void copyInto(Object[] anArray)
     E elementAt(int index)
     Enumeration<E> elements()
     void ensureCapacity(int minCapacity)
     boolean equals(Object o)
     E firstElement()
     void forEach(Consumer<? super E> action)
     E get(int index)
     int hashCode()
     int indexOf(Object o)
     int indexOf(Object o, int index)
     void insertElementAt(E obj, int index)
     boolean isEmpty()
     Iterator<E> iterator()
     E lastElement()
     int lastIndexOf(Object o)
     int lastIndexOf(Object o, int index)
     ListIterator<E> listIterator()
     ListIterator<E> listIterator(int index)
     E remove(int index)
     boolean remove(Object o)
     boolean removeAll(Collection<?> c)
     void removeAllElements()
     boolean removeElement(Object obj)
     void removeElementAt(int index)
     boolean removeIf(Predicate<? super E> filter)
     protected void removeRange(int fromIndex, int toIndex)
     void replaceAll(UnaryOperator<E> operator)
     boolean retainAll(Collection<?> c)
     E set(int index, E element)
     void setElementAt(E obj, int index)
     void setSize(int newSize)
     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)
     String toString()
     void trimToSize()
    
     // 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.Collection
     Stream<E> parallelStream()
     Stream<E> stream()
}


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