Thursday, 22 January 2015

Java : Collection Framework : HashMap (Values)


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HashMapExample.java
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;

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

        HashMap<Integer, String> hashMap = new HashMap<Integer, String>();

        hashMap.put(1, "Apple");
        hashMap.put(2, "Ball");
        hashMap.put(3, "Cat");

        System.out.println("hashMap : " + hashMap + "\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 = hashMap.values();

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

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

    }
}
Output
hashMap : {1=Apple, 2=Ball, 3=Cat}

collection : [Apple, Ball, Cat]

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

See also:
  • All JavaEE Viedos Playlist
  • All JavaEE Viedos
  • Servlets Tutorial
  • All Design Patterns Links
  • JDBC Tutorial
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