core Java Collections



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core Java Collections
1 Answer(s)      8 years ago
Posted in : Java Beginners
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September 14, 2009 at 1:52 PM

Hi Friend,

The Vector implements a growable array of objects. It contains components that can be accessed using an integer index like an array. The size of a Vector can grow or shrink as needed to accommodate adding and removing items in vector.


import java.util.*;
public class VectorDemo{
public static void main(String[] args){
Vector<Object> vector = new Vector<Object>();
int primitiveType = 10;
Integer wrapperType = new Integer(20);
String str = "tapan joshi";
vector.add(2, new Integer(30));
System.out.println("the elements of vector: " + vector);
System.out.println("The size of vector are: " + vector.size());
System.out.println("The elements at position 2 is: " + vector.elementAt(2));
System.out.println("The first element of vector is: " + vector.firstElement());
System.out.println("The last element of vector is: " + vector.lastElement());
Enumeration e=vector.elements();
System.out.println("The elements of vector: " + vector);
System.out.println("The elements are: " + e.nextElement());

Difference between Array and Vector:

1.Vector is implemented from List interface where as array is a primitive
2.The size of a vector can be changed dynamically where as size is fixed in array.
3.Vector is Synchronized where as array is not
4.Vector can store only object references where as Array can store primitive data type.



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