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java.util
public class

java.util.Vector<E>

java.lang.Object
java.util.AbstractCollection<E> Collection<E>
java.util.AbstractList<E> List<E>
java.util.Vector<E> Serializable Cloneable List<E> RandomAccess

Vector is a variable size contiguous indexable array of Objects. The size of the Vector is the number of Objects it contains. The capacity of the Vector is the number of Objects it can hold.

Objects may be inserted at any position up to the size of the Vector, increasing the size of the Vector. Objects at any position in the Vector may be removed, shrinking the size of the Vector. Objects at any position in the Vector may be replaced, which does not affect the Vector size.

The capacity of a Vector may be specified when the Vector is created. If the capacity of the Vector is exceeded, the capacity is increased, doubling by default.

Known Direct Subclasses

See Also

Summary

Fields

protected      int  capacityIncrement  How many elements should be added to the vector when it is detected that it needs to grow to accommodate extra entries. 
protected      int  elementCount  The number of elements or the size of the vector. 
protected      Object[]  elementData  The elements of the vector. 
Fields inherited from class java.util.AbstractList

Public Constructors

            Vector()
Constructs a new Vector using the default capacity.
            Vector(int capacity)
Constructs a new Vector using the specified capacity.
            Vector(int capacity, int capacityIncrement)
Constructs a new Vector using the specified capacity and capacity increment.
            Vector(Collection<? extends E> collection)
Constructs a new instance of Vector containing the elements in collection.

Public Methods

          void  add(int location, E object)
Adds the specified object into this Vector at the specified location.
          boolean  add(E object)
Adds the specified object at the end of this Vector.
  synchronized        boolean  addAll(int location, Collection<? extends E> collection)
Inserts the objects in the specified Collection at the specified location in this Vector.
  synchronized        boolean  addAll(Collection<? extends E> collection)
Adds the objects in the specified Collection to the end of this Vector.
  synchronized        void  addElement(E object)
Adds the specified object at the end of this Vector.
  synchronized        int  capacity()
Returns the number of elements this Vector can hold without growing.
          void  clear()
Removes all elements from this Vector, leaving it empty.
  synchronized        Object  clone()
Returns a new Vector with the same elements, size, capacity and capacity increment as this Vector.
          boolean  contains(Object object)
Searches this Vector for the specified object.
  synchronized        boolean  containsAll(Collection<?> collection)
Searches this Vector for all objects in the specified Collection.
  synchronized        void  copyInto(Object[] elements)
Attempts to copy elements contained by this Vector into the corresponding elements of the supplied Object array.
  synchronized        E  elementAt(int location)
Returns the element at the specified location in this Vector.
          Enumeration<E>  elements()
Returns an Enumeration on the elements of this Vector.
  synchronized        void  ensureCapacity(int minimumCapacity)
Ensures that this Vector can hold the specified number of elements without growing.
  synchronized        boolean  equals(Object object)
Compares the specified object to this Vector and answer if they are equal.
  synchronized        E  firstElement()
Returns the first element in this Vector.
  synchronized        E  get(int location)
Returns the element at the specified location in this Vector.
  synchronized        int  hashCode()
Returns an integer hash code for the receiver.
          int  indexOf(Object object)
Searches in this Vector for the index of the specified object.
  synchronized        int  indexOf(Object object, int location)
Searches in this Vector for the index of the specified object.
  synchronized        void  insertElementAt(E object, int location)
Inserts the specified object into this Vector at the specified location.
  synchronized        boolean  isEmpty()
Returns if this Vector has no elements, a size of zero.
  synchronized        E  lastElement()
Returns the last element in this Vector.
  synchronized        int  lastIndexOf(Object object, int location)
Searches in this Vector for the index of the specified object.
  synchronized        int  lastIndexOf(Object object)
Searches in this Vector for the index of the specified object.
  synchronized        E  remove(int location)
Removes the object at the specified location from this List.
          boolean  remove(Object object)
Removes the first occurrence, starting at the beginning and moving towards the end, of the specified object from this Vector.
  synchronized        boolean  removeAll(Collection<?> collection)
Removes all occurrences in this Vector of each object in the specified Collection.
  synchronized        void  removeAllElements()
Removes all elements from this Vector, leaving the size zero and the capacity unchanged.
  synchronized        boolean  removeElement(Object object)
Removes the first occurrence, starting at the beginning and moving towards the end, of the specified object from this Vector.
  synchronized        void  removeElementAt(int location)
Removes the element found at index position location from this Vector and decrements the size accordingly.
  synchronized        boolean  retainAll(Collection<?> collection)
Removes all objects from this Vector that are not contained in the specified Collection.
  synchronized        E  set(int location, E object)
Replaces the element at the specified location in this Vector with the specified object.
  synchronized        void  setElementAt(E object, int location)
Replaces the element at the specified location in this Vector with the specified object.
  synchronized        void  setSize(int length)
Sets the size of this Vector to the specified size.
  synchronized        int  size()
Returns the number of elements in this Vector.
  synchronized        List<E>  subList(int start, int end)
Returns a List of the specified portion of this Vector from the start index to one less than the end index.
  synchronized      <T>  T[]  toArray(T[] contents)
Returns an array containing all elements contained in this Vector.
  synchronized        Object[]  toArray()
Returns a new array containing all elements contained in this Vector.
  synchronized        String  toString()
Returns the string representation of this Vector.
  synchronized        void  trimToSize()
Sets the capacity of this Vector to be the same as the size.

Protected Methods

          void  removeRange(int start, int end)
Removes the objects in the specified range from the start to the, but not including, end index.
Methods inherited from class java.util.AbstractList
Methods inherited from class java.util.AbstractCollection
Methods inherited from class java.lang.Object
Methods inherited from interface java.lang.Iterable
Methods inherited from interface java.util.Collection
Methods inherited from interface java.util.List

Details

Fields

protected int capacityIncrement

How many elements should be added to the vector when it is detected that it needs to grow to accommodate extra entries.

protected int elementCount

The number of elements or the size of the vector.

protected Object[] elementData

The elements of the vector.

Public Constructors

public Vector()

Constructs a new Vector using the default capacity.

public Vector(int capacity)

Constructs a new Vector using the specified capacity.

Parameters

capacity the initial capacity of the new vector

public Vector(int capacity, int capacityIncrement)

Constructs a new Vector using the specified capacity and capacity increment.

Parameters

capacity the initial capacity of the new Vector
capacityIncrement the amount to increase the capacity when this Vector is full

public Vector(Collection<? extends E> collection)

Constructs a new instance of Vector containing the elements in collection. The order of the elements in the new Vector is dependent on the iteration order of the seed collection.

Parameters

collection the collection of elements to add

Public Methods

public void add(int location, E object)

Adds the specified object into this Vector at the specified location. The object is inserted before any previous element at the specified location. If the location is equal to the size of this Vector, the object is added at the end.

Parameters

location the index at which to insert the element
object the object to insert in this Vector

Throws

ArrayIndexOutOfBoundsException when location < 0 || > size()

See Also

public boolean add(E object)

Adds the specified object at the end of this Vector.

Parameters

object the object to add to the Vector

Returns

  • true

public synchronized boolean addAll(int location, Collection<? extends E> collection)

Inserts the objects in the specified Collection at the specified location in this Vector. The objects are inserted in the order in which they are returned from the Collection iterator.

Parameters

location the location to insert the objects
collection the Collection of objects

Returns

  • true if this Vector is modified, false otherwise

Throws

ArrayIndexOutOfBoundsException when location < 0 or location > size()

public synchronized boolean addAll(Collection<? extends E> collection)

Adds the objects in the specified Collection to the end of this Vector.

Parameters

collection the Collection of objects

Returns

  • true if this Vector is modified, false otherwise

public synchronized void addElement(E object)

Adds the specified object at the end of this Vector.

Parameters

object the object to add to the Vector

public synchronized int capacity()

Returns the number of elements this Vector can hold without growing.

Returns

  • the capacity of this Vector

See Also

public void clear()

Removes all elements from this Vector, leaving it empty.

See Also

public synchronized Object clone()

Returns a new Vector with the same elements, size, capacity and capacity increment as this Vector.

Returns

  • a shallow copy of this Vector

See Also

public boolean contains(Object object)

Searches this Vector for the specified object.

Parameters

object the object to look for in this Vector

Returns

  • true if object is an element of this Vector, false otherwise

See Also

public synchronized boolean containsAll(Collection<?> collection)

Searches this Vector for all objects in the specified Collection.

Parameters

collection the Collection of objects

Returns

  • true if all objects in the specified Collection are elements of this Vector, false otherwise

public synchronized void copyInto(Object[] elements)

Attempts to copy elements contained by this Vector into the corresponding elements of the supplied Object array.

Parameters

elements the Object array into which the elements of this Vector are copied

See Also

public synchronized E elementAt(int location)

Returns the element at the specified location in this Vector.

Parameters

location the index of the element to return in this Vector

Returns

  • the element at the specified location

Throws

ArrayIndexOutOfBoundsException when location < 0 || >= size()

See Also

public Enumeration<E> elements()

Returns an Enumeration on the elements of this Vector. The results of the Enumeration may be affected if the contents of this Vector are modified.

Returns

  • an Enumeration of the elements of this Vector

See Also

public synchronized void ensureCapacity(int minimumCapacity)

Ensures that this Vector can hold the specified number of elements without growing.

Parameters

minimumCapacity the minimum number of elements that this vector will hold before growing