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Scanner vs. StringTokenizer vs. String.Split
...ing, pulling out data of different types. It's very flexible, but arguably doesn't give you the simplest API for simply getting an array of strings delimited by a particular expression.
String.split() and Pattern.split() give you an easy syntax for doing the latter, but that's essentially all that t...
Batch files - number of command line arguments
...version for more than nine command line arguments. May be another one also does...
@echo off
setlocal
set argc_=1
set arg0_=%0
set argv_=
:_LOOP
set arg_=%1
if defined arg_ (
set arg%argc_%_=%1
set argv_=%argv_% %1
set /a argc_+=1
shift
goto _LOOP
)
::dont count arg0
set /a argc_-=1
ech...
AsyncTask and error handling on Android
...y code from using Handler to AsyncTask . The latter is great at what it does - asynchronous updates and handling of results in the main UI thread. What's unclear to me is how to handle exceptions if something goes haywire in AsyncTask#doInBackground .
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MySQL “incorrect string value” error when save unicode string in Django
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Does this solution avoid the issue discussed in @markpasc comment: '...4-byte UTF-8 characters such as emoji in MySQL 5.1's 3-byte utf8 character set'
– CatShoes
Apr 24 '13 at 16:51
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count number of lines in terminal output
...th a newline (I know that in this case, it will)
However, if the last line does not end with a newline 'wc -l' gives back a false result.
For example:
$ echo "asd" | wc -l
Will return 1 and
$ echo -n "asd" | wc -l
Will return 0
So what I often use is grep <anything> -c
$ echo "asd"...
Case insensitive Query with Spring CrudRepository
...ant)'. In Postgres it causes '.PSQLException: ERROR: function upper(bytea) does not exist' when q.applicant is null
– advortsov
Oct 17 '19 at 9:05
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Injecting Mockito mocks into a Spring bean
...n avoids services being mocked (which is what ReflectionTestUtils.setField does by default now)
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Parallel.ForEach() vs. foreach(IEnumerable.AsParallel())
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The difference is, B isn't parallel. The only thing AsParallel() does is that it wraps around a IEnumerable, so that when you use LINQ methods, their parallel variants are used. The wrapper's GetEnumerator() (which is used behind the scenes in the foreach) even returns the result of the or...
Loop through files in a folder using VBA?
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DIR() does not seem to return Hidden files.
– hamish
Nov 20 '18 at 14:26
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MYSQL OR vs IN performance
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The accepted answer doesn't explain the reason.
Below are quoted from High Performance MySQL, 3rd Edition.
In many database servers, IN() is just a synonym for multiple OR clauses, because the two are logically equivalent. Not so in MySQL,...