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Why not abstract fields?
...Child constructor would be trying to use a non-existent noargs constructor and that is a compilation error (not a warning).
– Stephen C
Feb 6 '10 at 0:15
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“git rm --cached x” vs “git reset head -- x”?
...
There are three places where a file, say, can be - the tree, the index and the working copy. When you just add a file to a folder, you are adding it to the working copy.
When you do something like git add file you add it to the index. And when you commit it, you add it to the tree as well.
It ...
Difference Between One-to-Many, Many-to-One and Many-to-Many?
... so this is probably a trivial question but I'm having trouble visualizing and understanding the differences and when to use each. I'm also a little unclear as to how concepts like uni-directional and bi-directional mappings affect the one-to-many/many-to-many relationships. I'm using Hibernate righ...
Change navbar color in Twitter Bootstrap
...avigation"></nav>
Default color usage
Here are the main colors and their usage:
#F8F8F8: navbar background
#E7E7E7: navbar border
#777: default color
#333: hover color (#5E5E5E for .nav-brand)
#555: active color
#D5D5D5: active background
Default style
If you want to put some custom...
Accessing last x characters of a string in Bash
...of string:
${string: -3}
or
${string:(-3)}
(mind the space between : and -3 in the first form).
Please refer to the Shell Parameter Expansion in the reference manual:
${parameter:offset}
${parameter:offset:length}
Expands to up to length characters of parameter starting at the character
spe...
How do I exchange keys with values in a dictionary?
I receive a dictionary as input, and would like to to return a dictionary whose keys will be the input's values and whose value will be the corresponding input keys. Values are unique.
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How to extract a git subdirectory and make a submodule out of it?
I started a project some months ago and stored everything within a main directory.
In my main directory "Project" there are several subdirectories containing different things:
Project/paper contains a document written in LaTeX
Project/sourcecode/RailsApp contains my rails app.
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Is there an MD5 Fixed Point where md5(x) == x?
.../2128)2128.
Since the limit as n goes to infinity of (1 − 1/n)n is 1/e, and 2128 is most certainly a very large number, this probability is almost exactly 1 − 1/e ≈ 63.21%.
Of course, there is no randomness actually involved – either there is a fixed point or there isn't. But, we can be 6...
How to install PostgreSQL's pg gem on Ubuntu?
...ting extended state information... Done (Reading database ... 166183 files and directories currently installed.) Removing bison ... Removing libnss3-dev ... Removing libnspr4-dev ... Removing libqt4-core ... Removing libqt4-test ... Removing libsqlite3-dev ... Processing triggers for man-db ..
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What is the behavior difference between return-path, reply-to and from?
... delivery
{C}QUIT
{S}221 Service closing transmission channel
Where {C} and {S} represent Client and Server commands, respectively.
The recipient's mail would look like:
Return-Path: coolstuff-you=yourcompany.com@mymailinglist.com
From: <coolstuff@mymailinglist.com>
To: <you@yourcompa...