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What's the advantage of a Java enum versus a class with public static final fields?
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Enum.valuesOf method does return same object if called twice?
– Emre Aktürk
Nov 23 '15 at 9:25
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I don't remember my android debug.keystore password
...tore password: keytool error: java.lang.Exception: Alias <aliasname> does not exist java.lang.Exception: Alias <aliasname> does not exist at sun.security.tools.KeyTool.doPrintEntry(Unknown Source) at sun.security.tools.KeyTool.doCommands(Unknown Source) at sun.sec...
How to calculate moving average using NumPy?
...rrays. Like many foundational objectives, this one is not small, and NumPy does it brilliantly.
The (much) larger SciPy contains a much larger collection of domain-specific libraries (called subpackages by SciPy devs)--for instance, numerical optimization (optimize), signal processsing (signal), an...
Can comments be used in JSON?
... and Abbrev properties? I've used this pattern before but stopped since it doesn't allow me to do that. It is a hack. Maybe if I prepend a property name with __comment__ instead. That is "__comment__Abbrev", still a hack, but would let me comment on all prpoerties
– Juan Mendes...
java.lang.IllegalArgumentException: View not attached to window manager
.... In general cases, we should not do this, but since the Android Framework does not provide any easy check for us, we have to use unusual way. Also, if a dialog's isShowing() call working as we expect, we do not need this kind of hack.
– SXC
Aug 21 '13 at 20:10...
Why doesn't await on Task.WhenAll throw an AggregateException?
...e the task so I can examine it (ie "Task myTask = await Task.WhenAll(...)" doesn't seem to work. and 2) I guess I don't see how await could ever represent multiple exceptions as just one exception.. which exception should it report? Pick one at random?
– Michael Ray Lovett
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Objective-C: difference between id and void *
... an id responds to. An id can easily refer to an instance of a class that does not inherent from NSObject. Practically speaking, though, your statement best matches real world behavior; you can't mix non-<NSObject> implementing classes with Foundation API and get very far, that is definitel...
How to debug Lock wait timeout exceeded on MySQL?
...ted to the frozen lock, but unlike the other active transactions, this one does not show up with the query that was issued and instead claims the transaction is "cleaning up," yet has multiple row locks)
The moral of the story is that a transaction can be active even though the thread is sleeping.
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Should each and every table have a primary key?
...to be clustered, you need some kind of a primary key.
If your table design does not need a primary key, rethink your design: most probably, you are missing something. Why keep identical records?
In MySQL, the InnoDB storage engine always creates a primary key if you didn't specify it explicitly, t...
Get all non-unique values (i.e.: duplicate/more than one occurrence) in an array
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This script doesn't work so well with more than 2 duplicates (e.g. arr = [9, 9, 9, 111, 2, 3, 3, 3, 4, 4, 5, 7];
– Mottie
Oct 23 '10 at 15:00
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