Java : Collection Framework : TreeMap (Values)

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TreeMapExample.java

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

/*
 * Example of values() method.
 */
public class TreeMapExample
{
    public static void main( String[] args )
    {

        TreeMap<Integer, String> treeMap = new TreeMap<Integer, String>();

        treeMap.put(1, "Cat");
        treeMap.put(2, "Dog");
        treeMap.put(4, "Apple");
        treeMap.put(3, "Ball");

        System.out.println("treeMap : " + treeMap + "\n");

        /*
         * Returns a Collection view of the values contained in this map. The
         * collection is backed by the map, so changes to the map are reflected
         * in the collection, and vice-versa.
         * 
         * If the map is modified while an iteration over the collection is in
         * progress (except through the iterator's own remove operation), the
         * results of the iteration are undefined. The collection supports
         * element removal, which removes the corresponding mapping from the
         * map, via the Iterator.remove, Collection.remove, removeAll, retainAll
         * and clear operations. It does not support the add or addAll
         * operations.
         */
        Collection<String> collection = treeMap.values();

        System.out.println("collection : " + collection + "\n");

        for( Iterator<String> iterator = collection.iterator(); iterator
                .hasNext(); )
        {
            String value = iterator.next();
            System.out.println(value);
        }
    }
}

Output

treeMap : {1=Cat, 2=Dog, 3=Ball, 4=Apple}

collection : [Cat, Dog, Ball, Apple]

Cat
Dog
Ball
Apple

To Download TreeMapDemoValues Project Click the below link
https://sites.google.com/site/javaee4321/java-collections/TreeMapDemoValues.zip?attredirects=0&d=1

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