Vector in java.

Vector in java

• It is a predefined class and used to store the data.
• We can store data of any data type(float,int,character,string).
• It is defined inside the package java.util.
• It is is similar to a traditional Java array, except that it can grow as necessary to accommodate new elements.
• Elements of vector can be accessed using index number and it starts from zero.
• Vectors are Synchronized.
• Vector implements a dynamic array that means it can grow or shrink as required.
• It is mostly used when there is no idea about the numbers of element in array.
• There are three way to create vector.
• 1. Vector vec = new Vector();
• It will creates an empty Vector of capacity 10.
• The default initial capacity of vector is 10.
• 2. Vector vec = new Vector(5);
• It will create a Vector of initial capacity of 5.
• 3. Vector vec = new Vector(5,10);
• Here 5 is the initial capacity and 10 is the capacity increment.
• It means upon insertion of 6th element the size would be 15 (5+10).
• Example

 import java.util.Vector;
import java.util.Enumeration;
 class Program 
 {
   public static void main(String args[]) 
   {
      /*creating variable of enumeration*/
      Enumeration courses;
      /*creating object of vector*/
      Vector courseName = new Vector(); 
      /*adding data into vector*/
      courseName.add("C");
      courseName.add("C++");
      courseName.add("JAVA");
      courseName.add("PHP");
      courseName.add("ANDROID");
      courseName.add("C#");
      /*passing vector data into enumeration*/
      courses = courseName.elements();
      /*Accessing data of enumeration*/
      while (courses.hasMoreElements()) 
      {
       /*printing data of enumeration*/
       System.out.println(courses.nextElement()); 
      }
   }
}
/*
Output
C
C++
JAVA
PHP
ANDROID
C#
*/