http://snippets.dzone.com/posts Mon, 21 Jul 2008 07:41:46 GMT DZone Snippets: constant code http://snippets.dzone.com/posts/show/4501 // Obtaining the value of a static public constant of a class, here Boolean for example <br /><code> <br /> Object returnedObj = null; <br /> try { <br /> Class clazz = Class.forName("java.lang.Boolean"); <br /> returnedObj = clazz.getField("TRUE").get(clazz); <br /> assert java.lang.Boolean.TRUE == returnedObj : "wrong returned object"; <br /> } catch (ClassNotFoundException e) { <br /> e.printStackTrace(); <br /> } catch (SecurityException e) { <br /> e.printStackTrace(); <br /> } catch (NoSuchFieldException e) { <br /> e.printStackTrace(); <br /> } catch (IllegalArgumentException e) { <br /> e.printStackTrace(); <br /> } catch (IllegalAccessException e) { <br /> e.printStackTrace(); <br /> } <br /> <br /> return returnedObj; <br /></code> Thu, 06 Sep 2007 14:59:06 GMT http://snippets.dzone.com/posts/show/4501 Archanciel (Jean-Pierre Schnyder) http://snippets.dzone.com/posts/show/737 From Alex's <a href=http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/65207>recipe</a>. <br /><code> <br /># Put in const.py...: <br />class _const: <br /> class ConstError(TypeError): pass <br /> def __setattr__(self,name,value): <br /> if self.__dict__.has_key(name): <br /> raise self.ConstError, "Can't rebind const(%s)"%name <br /> self.__dict__[name]=value <br />import sys <br />sys.modules[__name__]=_const() <br /></code> <br />that's all -- now any client-code can <br /><code> <br />import const <br />const.magic = 23 # bind an attribute ONCE <br />const.magic = 88 # raises const.ConstError if re-bind <br /></code> <br /> Sun, 18 Sep 2005 13:35:51 GMT http://snippets.dzone.com/posts/show/737 korakot (Korakot Chaovavanich)