I read that to use equals() method in java we also have to override the hashcode() method and that the 开发者_运维知识库equal (logically) objects should have eual hashcodes, but doesn\'t that imply re
I\'m running Rails 3 and like to have a message system. Here is the tutorial for it: http://www.novawave.net/public/rails_messaging_tutorial.html
As my first Rails app, I\'m trying to put together a simple blog application where users can vote on posts. I generated the Blogpost scaffold with a integer column (entitled \"upvote\") for keeping tr
I know that __call__ method in a class is triggered when the instance of a class is called. However, I have no idea when I can use this special method, because one can simply create a new method and p
I switched over to Xcode 4 while it was in beta, and I have mostly been editing existing code so haven\'开发者_运维知识库t really considered this much until now...
I\'m creating basic message board where many comments belong to a post and a post belongs to only one topic. My issue is that I\'m not sure how create a new Topic from the Post model\'s form. I\'m rec
I have been working though the examples in Using a Directory Enumerator in the Apple Low-Level File sections.
I wrote the following:开发者_如何学运维 public class Point { private double _radius , _alpha; public Point ( int x , int y )
I\'m working on a class that reads some sensor information and returns it as a hash.I would like to use the hash keys as accessors, but I\'m not having much luck getting it work.Here are the relevant
I am trying to define some classes in Ruby that have an inheritance hierarchy, but I want to use one of the methods in the base class in the derived class. The twist is that I don\'t want to call the
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