Vector in Java

Vectors are an essential data structure in Java that provides dynamic, resizable arrays, making them a versatile tool for managing collections of data.

vector in java

What is a Vector in Java ?

A Vector in Java is a part of the Collection Framework. Vector provides a dynamic array-like structure. Unlike traditional arrays vectors can dynamically grow and shrink in size as elements are added or removed, making vectors suitable for various data management tasks.

Properties of Vector

  • Insertion Order is preserved in Vectors
  • Duplicates are allowed in vectors
  • null insertion is possible in vectors
  • Vector implements RandomAccess, Cloneable, and interface.
  • Vector objects are thread-safe because all methods of vectors are synchronized.

Vector Consturctor


        Vector v = new Vector();

The constructor creates an empty Vector objet with default initial capacity 10.

Once the vector capacity full then a new Vector object will be created with new capacity. new capacity is calculate as given below

new capacity = current capacity * 2

Vector(int initialCapacity)

        Vector v = new Vector( int initialCapacity);

This constructor creates and empty Vector object with the specified initial capacity.

Vector(int initialCapacity, int incrementCapacity)

        Vector v = new  Vector(int initialCapacity,
 int capacityIncrement );

This constructor creates an empty Vector object with the specified initial capacity and capacity increment.

Vector(Collection c)

        Vector v = new Vector( Collection c); 

This constructor creates an equivalent Vector object for given collection c. Mostly used for inter conversion between Collection objects.

Vector Example in Java

package vector;

import java.util.Vector;

public class VectorDemo {
    public static void main(String[] args) {
        Vector vector = new Vector();
        System.out.println(vector.capacity()); //initial capacity
        for(int i=0;i<10;i++){
        System.out.println(vector.capacity()); //updated capacity


Vector Java code

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