/*
Get Collection of Values from Java Hashtable example
This Java Example shows how to get a Collection of values contained in Hashtable
using values method of Java Hashtable class.
*/
import java.util.Enumeration;
import java.util.Iterator;
import java.util.Hashtable;
import java.util.Collection;
public class GetCollectionOfValuesFromHashtableExample {
public static void main(String[] args) {
//create Hashtable object
Hashtable ht = new Hashtable();
//add key value pairs to Hashtable
ht.put("1","One");
ht.put("2","Two");
ht.put("3","Three");
/*
get Collection of values contained in Hashtable using
Collection values() method of Hashtable class
*/
Collection c = ht.values();
System.out.println("Values of Collection created from Hashtable are :");
//iterate through the collection
Iterator itr = c.iterator();
while(itr.hasNext())
System.out.println(itr.next());
/*
Please note that resultant Collection object is backed by the Hashtable.
Any value that is removed from Collection will also be removed from
original Hashtable object. The same is not the case with the element
addition.
*/
//remove One from collection
c.remove("One");
//print values of original values of Hashtable
System.out.println("Hashtable values after removal from Collection are :");
Enumeration e = ht.elements();
while(e.hasMoreElements())
System.out.println(e.nextElement());
}
}
/*
Output would be
Values of Collection created from Hashtable are :
Three
Two
One
Hashtable values after removal from Collection are :
Three
Two
*/
