While answering this question, I wanted to use a generic sum of Collection function. Java doesn't have a native method, so I wrote one. There are a couple things I don't like about it though, so I wrote a more specific method for my answer. public static <T extends Number, U extends Collection<

I'm trying to sanitize strings in my company's databases (from the early days before we had better data validation). However, the function isn't working. I figured out that it's only assigning '[' to the @Pattern string, but I'm not sure why. Code to re-create the function (you'll need to add yo...

I have a project that relies on finding all cycles in a graph that pass through a vertex at most k times. Naturally, I'm sticking with the case of k=1 for the sake of development right now. I've come to the conclusion that this algorithm as a depth first search is at worst O((kn)^(kn)) for a comp...

I created a pretty complex algorithm for calculating matches on a Bejeweled board that kept track of matches involving wilds. After doing some in-game testing, I found quite a few bugs that needed to be eliminated. In order to deal with this problem, I first created an undo system for the gam...

I have an array filled with 5 other arrays that consists of arrays of 2 values (first a date then a count): [ [ [dt, cnt], [dt, cnt], .... ], [ [dt, cnt], [dt, cnt], .... ], [ [dt, cnt], [dt, cnt], .... ], [ [dt, cnt], [dt, cnt], .... ], [ [dt,...

This is my first project over 50 lines of code, and considering that I've only started programming a few months ago, I'm fully aware I'm making all kinds of newbie mistakes that you should never ever do. But I don't know what those are, or at least, why those are. So without further ado, here's ...

I still feel like I struggle to grasp some concepts of SOLID principles at times, and am hoping for some clarification here. The following classes are entities in an Entity Framework project. namespace MyCompany.MyProduct.Core { public abstract class DataError { public int ErrorId {...

Hoping that someone can help me here with the Bootstrap Modal. I have a modal and within that modal, there is a dropdown that displays large hidden content, this is working. Now when you open the next modal, stacked on top of the first modal and dismiss it, the scrolling on modal underneath be...

Using if not to test if a variable has been set, but what if it is set and has a zero value? Seeing a lot of posts explaining that bool is a subclass of int, but having trouble finding the answer to how to make something with a value of zero be true. Something tells me there's a better way to d...

I have the following class: class Uploader def initialize(host,user,opts) @host = host @user = user @opts = opts end def upload(local_file_path,remote_file_path) Net::SFTP.start(@host,@user,@opts) do |sftp| sftp.upload!(local_file_path,remote_file_...