public static <K extends Comparable<? super K>, V > Map<K, V>
	sortByKey( Map<K, V> map )
	{
		List<Map.Entry<K, V>> list =
				new LinkedList<Map.Entry<K, V>>( map.entrySet() );
		Collections.sort( list, new Comparator<Map.Entry<K, V>>()
		{
			public int compare( Map.Entry<K, V> o1, Map.Entry<K, V> o2 )
			{
				return (o1.getKey()).compareTo( o2.getKey() );
			}
		} );

		Map<K, V> result = new LinkedHashMap<K, V>();
		for (Map.Entry<K, V> entry : list)
		{
			result.put( entry.getKey(), entry.getValue() );
		}
		return result;
	}