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How can I safely encode a string in Java to use as a filename?
I'm receiving a string from an external process. I want to use that String to make a filename, and then write to that file. Here's my code snippet to do this:
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Is SecureRandom thread safe?
...xtends Random, which always had a de facto threadsafe implementation, and, from Java 7, explicitly guarantees threadsafety.
If many threads are using a single SecureRandom, there might be contention that hurts performance. On the other hand, initializing a SecureRandom instance can be relatively sl...
How Do I Document Packages in Java?
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This is the old way to do it. From Java 1.5 onwards you can use package-info.java
– k2col
Nov 1 '13 at 16:20
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Repeatedly run a shell command until it fails?
...until=fail --message="test succeeded" --delay=1 ./runtest
Tool available from https://github.com/minfrin/retry.
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PHP prepend associative array with literal keys?
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See also array_merge() and its difference from using the + operator: br.php.net/manual/en/function.array-merge.php#92602
– Havenard
Sep 3 '09 at 1:33
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How can I configure Logback to log different levels for a logger to different destinations?
... This is the best filtering solution to separate trace debug info from warn and error
– kheraud
Apr 20 '16 at 13:12
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What is the syntax for “not equal” in SQLite?
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From the official documentation:
The non-equals operator can be either != or <>
So your code becomes:
Cursor findNormalItems = db.query("items", columns, "type != ?",
new String...
Way to get all alphabetic chars in an array in PHP?
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range for A-Z but if you want to go for example from A to DU then:
function generateAlphabet($na) {
$sa = "";
while ($na >= 0) {
$sa = chr($na % 26 + 65) . $sa;
$na = floor($na / 26) - 1;
}
return $sa;
}
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Renaming columns in pandas
...df
X Y c d e
0 x x x x x
1 x x x x x
2 x x x x x
From v0.25, you can also specify errors='raise' to raise errors if an invalid column-to-rename is specified. See v0.25 rename() docs.
REASSIGN COLUMN HEADERS
Use df.set_axis() with axis=1 and inplace=False (to return a copy)...
When should we implement Serializable interface?
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From What's this "serialization" thing all about?:
It lets you take an object or group of
objects, put them on a disk or send
them through a wire or wireless
transport mechanism, then later,
perhaps on another com...