Vector Class example java

Vector Class

A vector also stores elements similar to ArrayList, but Vector is synchronized.It means if several threads act on same vector object simultaneously,the result will be reliable.

Default Capacity=10
Load Factor=0.75

Vector Class Methods

• boolean add(element obj)
• void add(int position,element obj)
• element remove(int position)
• boolean remove(Object obj)
• void clear()
• element set(int position,Object obj)

• boolean contains(Object obj)
• element get(int position)
• int indexOf(Object obj)
• int lastIndexOf(Object obj)
• int size()
• int capacity()

Program:

/**

 * 

 */

package com.collectionpack;

import java.util.ListIterator;

import java.util.Vector;

/**

 * @author Abhinaw.Tripathi

 *

 */

public class VectorDemo

{

/**

* @param args

*/

public static void main(String[] args)

{

Vector<Integer> vector=new Vector<Integer>();

int x[]={22,10,40,15,60};

for(int i=0;i<x.length;i++)

{

vector.add(x[i]);

}

System.out.println("Vetcor elements:");

for(int  j=0;j<vector.size();j++)

{

System.out.println(vector.get(j));

}

System.out.println("Elements using ListIterator....");

ListIterator lite=vector.listIterator();

System.out.println(("In forward Direction"));

while(lite.hasNext())

{

System.out.println(lite.next() + "\t");

}

System.out.println("In backward direction");

while(lite.hasPrevious())

{

System.out.println(lite.hasPrevious() + "\t");

}

}

}

What is the difference between ArrayList and Vector?

Ans:

ArrayList                                                                                                     Vector

1. ArrayList Object is not Synchronized.    1.Vector Object is synchronized by default.

2. ArrayList is faster in single threaded-       2.In case of Multi-Threads,vector is advisable but           

                                                                           becomes slow in case of single Thread.

-mode.

3.It increases it size by 50% half of its size.  3.It increases its size by doubling it.

Can you synchronize the ArrayList object?

Ans: Yes,we can use synchronizedList() method to synchronize the ArrayList.

          Collections.synchronizedList(new ArrayList());