Java basic Knowledge Enhancement collection Frame Note 25:vector's unique features

1. Vector- specific features :
(1) Add function
public void addelement (Object obj)--add ()
(2) Get function
Public Object elementat (int index)--get ()
Public enumeration elements ()--iterator Iterator ()

Enumeration (Interface):

Boolean hasmoreelements ()--Hasnext ()
Object nextelement ()--Next ()

2. code example:

1  Packagecn.itcast_02;2 3 Importjava.util.Enumeration;4 ImportJava.util.Vector;5 6 /*7 * Unique features of vector:8 * 1: Add features9 * public void addelement (Object obj)--Add ()Ten * 2: Get features One * Public Object elementat (int index)--get () A * Public enumeration elements ()--Iterator Iterator () - * Boolean hasmoreelements () Hasnext () - * Object nextelement () Next () the  *  - * Reasons for JDK Upgrade: - * A: Security - * B: Efficiency + * C: Simplified writing -  */ +  Public classVectordemo { A      Public Static voidMain (string[] args) { at         //To create a collection object -Vector v =NewVector (); -  -         //Add features -V.addelement ("Hello"); -V.addelement ("World"); inV.addelement ("Java"); -  to         //Traverse +          for(intx = 0; x < V.size (); X + +) { -String s =(String) v.elementat (x); the System.out.println (s); *         } $ Panax NotoginsengSystem.out.println ("------------------"); -  theEnumeration en = V.elements ();//returns an object of the implementation class +          while(En.hasmoreelements ()) { AString s =(String) en.nextelement (); the System.out.println (s); +         } -     } $}

The results are as follows:

Java basic Knowledge Enhancement collection Frame Note 25:vector's unique features