Java – Vector Collection

Vector:

• Vector implements List.
• Vector allow duplicates and follow insertion order.
• Vector is synchronized by default.

import java.util.*; class Code {             public static void main(String[] args)             {                         Vector<Integer> v = new Vector<Integer>();                         for (int i=1 ; i<=5 ; i++){                                     v.add(i*5);                         }                         System.out.println(“Vector : ” + v);             } }

Enumeration:

• Vector is legacy(old) class since first version of JDK.
• Enumeration interface used to process vector element by element.
• elements() method of Vector class returns Enumeration-interface.

Methods of Enumeration:

1. hasMoreElements(): is used to check the element is present or not in Enumeration
2. nextElement(): returns the next element in the enumeration.

import java.util.*; class Code {       public static void main(String[] args)       {                   Vector<Integer> v = new Vector<Integer>();                   for (int i=1 ; i<=5 ; i++){                               v.add(i*5);                   }                   System.out.println(“Vector : “);                   Enumeration<Integer> en = v.elements();                   while(en.hasMoreElements())                   {                               Integer x = en.nextElement();                               System.out.println(x);                   }       } }