Can a Collection be traversed in reverse order?

Question

Hi..
I am using a List of Objects to display..
When I click a Link, it has to be displayed in the reverse order..
Is there any way to do this..
Please help me..
Thanks in advance..

Answer 1

here is the code by which you can traverse a List in
reverse order without modifying contents of the list
import java.util.*;
public class ReverseList {
public static void main(String[] args) {
List first = new ArrayList();
first.add("Java");
first.add("Is");
first.add("Easy");
ListIterator iterator = first.listIterator();
//now traverse a list in forward direction so that
you can reach at the end of the list
while(iterator.hasNext()) {
iterator.next();
//now traverse a list in reverse direction
while(iterator.hasPrevious()) {
System.out.println(iterator.previous());
For a random access list, such as ArrayList, the above is very inefficient. Instead try:
List<String> l = new ArrayList<String>();
l.add( "Java" );
l.add( "Is" );
l.add( "Easy" );
// Jump straight to the end
ListIterator<String> iterator = l.listIterator( list.size() );
// Start iterating
while( iterator.hasPrevious() ) {
    System.out.println( iterator.previous() );
}