Hastable order reversing

Question

Can i get sample code for first in first out using Hashtable.
Actually we are iterating hastable object to get the value of a key and display it on screen,but screen displays in reverse order(last value of table as first in screen), i want to display first value as a first in screen.
kindly do get me sample code regarding my problem

Answer 1

Hi.
Hashtable itself is not designed to maintain order of elements in it. It only serves as mapping between keys and values. What you need is to get the keys from the hashtable, then sort them in any order you like and then retrieve the values iterating through those sorted keys. Here is the sample code:
Hashtable hashtable = new Hashtable();
/* add some key/value pairs */
/* get the Set of keys */
Set sKeys = hashtable.keySet();
/* copy the keys to Vector */
Vector keys = new Vector(sKeys);
/* sort the Vector */
Collections.sort(keys);
/* or sort using custom Comparator*/
// Collections.sort(keys, myComparator);
/* iterate through keys to get values */
for(Iterator i = keys.iterator(); i.hasNext(); ) {
    Object value = hashtable.get(i.next());
}