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1 Answer(s)      8 years ago
Posted in : Java Beginners
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September 11, 2008 at 6:17 PM

Hi ,

A hash-table is a data-structure that consists of an array of linked lists.

The beauty of this arrangement is that you can have the speed of array-access, along with the convenience of inserting objects into linked lists. What's more, inserting and searching through a hash-table is very, very fast.

import java.util.*;
import java.io.*;
import java.util.Hashtable;

public class HashTableTest {

public static void main(String args[]){
System.out.println("welcome to Roseindia");
Hashtable hash = new Hashtable();

hash.put("vinod", "vinod");
hash.put(hash, hash);

System.out.println("Display list : " + hash);

catch(Exception e){
System.out.println("error in table:" + e.getMessage());


import java.util.*;

public class StackExample {
public static void vectorShow ( Vector v ) {
System.out.println ( "printing vector contents" ) ;
for ( int i = 0, length = v.size ( ) ; i < length; i++ )
System.out.println ( v.get ( i ) ) ;
public static void main ( String [ ] args ) {
Stack<String> stack = new Stack<String>( ) ;
//Treat as a Stack
stack.push ("welcome") ;
System.out.println(stack.pop ( ) ) ;
//Treat as a vector
stack.add ( "1" ) ;
stack.add ( "2" ) ;
stack.add ( "3" ) ;
System.out.println ( stack.get ( 2 ) ) ;
System.out.println ( stack.contains ( "1" ) ) ;
stack.insertElementAt ( "5", 1 ) ;
stack.removeElementAt ( 2 ) ;
vectorShow(stack) ;

import java.util.*;

public class QueueList {
public static void main(String[] args) {
Queue<String> queue = new LinkedList<String>();

System.out.println("Size of list: " + queue.size());
System.out.println("Queue head using peek : " + queue.peek());
System.out.println("Queue head using element: " + queue.element());
Object data;
while ((data = queue.poll()) != null) {


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