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Can we instantiate an abstract class?
... are creating an instance of an anonymous subclass of your abstract class. And then you are invoking the method on your abstract class reference pointing to subclass object.
This behaviour is clearly listed in JLS - Section # 15.9.1: -
If the class instance creation expression ends in a class b...
How does HashSet compare elements for equality?
..., it will find the hash code using IEqualityComparer<T>.GetHashCode, and store both the hash code and the element (after checking whether the element is already in the set, of course).
To look an element up, it will first use the IEqualityComparer<T>.GetHashCode to find the hash code, t...
How can I stop a Postgres script when it encounters an error?
...far from perfection
\set ON_ERROR_STOP on
there exists much more simple and convenient way - use psql with parameter:
psql -v ON_ERROR_STOP=1
better to use also -X parameter turning off .psqlrc file usage.
Works perfectly for me
p.s. the solution found in great post from Peter Eisentraut. Tha...
Solutions for distributing HTML5 applications as desktop applications? [closed]
...by GitHub for building cross-platform desktop applications with HTML, CSS, and JavaScript. Electron accomplishes this by combining Chromium and Node.js into a single runtime and apps can be packaged for Mac, Windows, and Linux. (source)
The folks at github use this to provide their code editor Ato...
Generating an MD5 checksum of a file
Is there any simple way of generating (and checking) MD5 checksums of a list of files in Python? (I have a small program I'm working on, and I'd like to confirm the checksums of the files).
...
Why does Python code run faster in a function?
...ompiled, the local variables are stored in a fixed-size array (not a dict) and variable names are assigned to indexes. This is possible because you can't dynamically add local variables to a function. Then retrieving a local variable is literally a pointer lookup into the list and a refcount increas...
How to overwrite styling in Twitter Bootstrap
...ow can I change this so that it goes to the right instead? I'm using HAML and SASS but am relatively new to web development.
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append multiple values for one key in a dictionary [duplicate]
I am new to python and I have a list of years and values for each year. What I want to do is check if the year already exists in a dictionary and if it does, append the value to that list of values for the specific key.
...
Eclipse Android and gitignore
...itHub, it also includes amongst other things the .project, I disagree here and want your opinion. Scenario: I added new classes to my project. When I pulled from another machine, they were not in the project. Please check it out: github.com/github/gitignore/blob/master/Global/…
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Which websocket library to use with Node.js? [closed]
...answer. Feel free to edit me with your improvements.
ws
WebSocket server and client for node.js. One of the fastest libraries if not the fastest one.
websocket-node
WebSocket server and client for node.js
websocket-driver-node WebSocket server and client protocol parser node.js - used in faye-webs...