Iterate through the values of Java TreeMap example

This Java Example shows how to iterate through the values contained in the TreeMap object.

import java.util.Collection;
import java.util.TreeMap;
import java.util.Iterator;

public class IterateValuesOfTreeMapExample {

 public static void main(String[] args) {

  // create TreeMap object
  TreeMap tMap = new TreeMap();

  // add key value pairs to TreeMap
  tMap.put("1", "One");
  tMap.put("2", "Two");
  tMap.put("3", "Three");

  /**
    values() - Returns a collection view of the values contained
     in this map. The collection's iterator will return the values
     in the order that their corresponding keys appear in the tree.
     The collection is backed by this TreeMap instance, so changes
     to this map are reflected in the collection, and vice-versa
   **/
  Collection c = tMap.values();

  // obtain an Iterator for Collection
  Iterator itr = c.iterator();

  System.out.println("The map contains values...");
  // iterate through TreeMap values iterator
  while (itr.hasNext())
   System.out.println(itr.next());
 }
}

The output is:


The map contains values...
One
Two
Three