class util {
  	/**
	 * This method returns true if the collection is null or is empty.
	 * @param collection
	 * @return true | false
	 */
	public static boolean isEmpty( Collection<?> collection ){
		if( collection == null || collection.isEmpty() ){
			return true;
		}
		return false;
	}

	/**
	 * This method returns true of the map is null or is empty.
	 * @param map
	 * @return true | false
	 */
	public static boolean isEmpty( Map<?, ?> map ){
		if( map == null || map.isEmpty() ){
			return true;
		}
		return false;
	}

	/**
	 * This method returns true if the objet is null.
	 * @param object
	 * @return true | false
	 */
	public static boolean isEmpty( Object object ){
		if( object == null ){
			return true;
		}
		return false;
	}

	/**
	 * This method returns true if the input array is null or its length is zero.
	 * @param array
	 * @return true | false
	 */
	public static boolean isEmpty( Object[] array ){
		if( array == null || array.length == 0 ){
			return true;
		}
		return false;
	}

	/**
	 * This method returns true if the input string is null or its length is zero.
	 * @param string
	 * @return true | false
	 */
	public static boolean isEmpty( String string ){
		if( string == null || string.trim().length() == 0 ){
			return true;
		}
		return false;
	}
}