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What is this: [Ljava.lang.Object;?
...f the class of which the object is an instance, the at-sign character `@', and the unsigned hexadecimal representation of the hash code of the object. In other words, this method returns a string equal to the value of:
getClass().getName() + '@' + Integer.toHexString(hashCode())
Note: you can no...
Purpose of Django setting ‘SECRET_KEY’
...ly is the point of the SECRET_KEY in django? I did a few google searches and checked out the docs ( https://docs.djangoproject.com/en/dev/ref/settings/#secret-key ), but I was looking for a more in-depth explanation of this, and why it is required.
...
how to exclude null values in array_agg like in string_agg using postgres?
... non_canonical_users
FROM groups g
GROUP BY g.id
) s
Or, simpler and may be cheaper, using array_to_string which eliminates nulls:
SELECT
g.id,
array_to_string(
array_agg(CASE WHEN g.canonical = 'Y' THEN g.users ELSE NULL END)
, ','
) canonical_users,
array...
How do I use Java to read from a file that is actively being written to?
...r. I'm still looking for a better way, but this works for me for now.
Oh, and I'll caveat this with: I'm using 1.4.2. Yes I know I'm in the stone ages still.
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How to get request URI without context path?
...ere a reason to use this instead of getServletPath()? I'm writing a filter and I noticed that getPathInfo() returns null, but getServletPath() returns the path minus the context (suitable for passing on to the request dispatcher).
– Jason C
Jun 25 '17 at 23:00
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examining history of deleted file
If I delete a file in Subversion, how can I look at it's history and contents? If I try to do svn cat or svn log on a nonexistent file, it complains that the file doesn't exist.
...
Google Authenticator implementation in Python
... parameters:
secret is a secret value known to server (the above script) and client (Google Authenticator, by providing it as password within application),
intervals_no is the number incremeneted after each generation of the token (this should be probably resolved on the server by checking some fi...
Why is '397' used for ReSharper GetHashCode override?
...397 is a prime of sufficient size to cause the result variable to overflow and mix the bits of the hash somewhat, providing a better distribution of hash codes. There's nothing particularly special about 397 that distinguishes it from other primes of the same magnitude.
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windows batch SET inside IF not working
...y.
Therefore the delayedExpansion syntax exists, it uses ! instead of % and it is evaluated at execution time, not parse time.
Please note that in order to use !, the additional statement setlocal EnableDelayedExpansion is needed.
setlocal EnableDelayedExpansion
set var1=true
if "%var1%"=="true...
Android: Scale a Drawable or background image?
... like this:
<?xml version="1.0" encoding="utf-8"?>
<bitmap xmlns:android="http://schemas.android.com/apk/res/android"
android:gravity="center"
android:src="@drawable/list_bkgnd" />
Then it will be centered in the view if used as background. There are also other flags: http://d...