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Should I declare Jackson's ObjectMapper as a static field?
... is still thread-safe after ObjectMapper#setDateFormat() is called. It is known that SimpleDateFormat is not thread safe, thus ObjectMapper won't be unless it clones e.g. SerializationConfig before each writeValue() (I doubt). Could you debunk my fear?
– dma_k
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Populating a ListView using an ArrayList?
... //let me assume that you are putting the values in this arraylist
//Now convert your arraylist to array
//You will get an exmaple here
//http://www.java-tips.org/java-se-tips/java.lang/how-to-convert-an-arraylist-into-an-array.html
private String arr[]=convert(arrlist);
@O...
Append values to query string
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As of ASP.NET Core 3.0 WebUtilities is now part of the ASP.NET SDK so no nuget package needed.
– user1069816
Mar 15 at 22:56
1
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Checkout one file from Subversion
... it's simpler to use svn export than it is to use the web interface, if I know what file I want. The questioner already uses SVN, so I guess it depends what client and whether that client makes it easy to use svn export. I do find the web interface better for browsing than svn ls, though :-)
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How to cherry pick a range of commits and merge into another branch?
...the comments:
This assumes that B is not a root commit; you'll get an "unknown revision" error otherwise.
Note: as of Git 2.9.x/2.10 (Q3 2016), you can cherry-pick a range of commit directly on an orphan branch (empty head): see "How to make existing branch an orphan in git".
Original answer (Jan...
PHP ORMs: Doctrine vs. Propel
...t more. The release is planned for the end of Q1 2010, but you can test it now in your Symfony projects.
– Jan Fabry
Jan 15 '10 at 7:24
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OpenCV C++/Obj-C: Detecting a sheet of paper / Square Detection
...mplemented the OpenCV square-detection example in my test application, but now need to filter the output, because it's quite messy - or is my code wrong?
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Hidden Features of C#? [closed]
... makeHandler(1, 0);
Note the chaining: (dx, dy) => (sender, e) =>
Now that's why I'm happy to have taken the functional programming class :-)
Other than the pointers in C, I think it's the other fundamental thing you should learn :-)
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Finding the type of an object in C++
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Good if you really don't know what your object is. The accepted answer assumes you do.
– unludo
Feb 28 '12 at 16:01
4
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pandas three-way joining multiple dataframes on columns
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This is decent advice and has now been incorporated into pandas merging 101 (see the section on merging multiple dataframes). It's worth noting that if your join keys are unique, using pd.concat will result in simpler syntax: pd.concat([df.set_index('name...