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Java Synchronized Block for .class
...ass instance (the object representing the class metadata at runtime) one thread can be in this block.
With synchronized(this) the block is guarded by the instance. For every instance only one thread may enter the block.
synchronized(X.class) is used to make sure that there is exactly one Thread i...
How to get current timestamp in string format in Java? “yyyy.MM.dd.HH.mm.ss”
...des are similar to those of java.text.SimpleDateFormat but not exactly, so read the doc carefully.
DateTimeFormatter formatter = DateTimeFormatter.ofPattern( "uuuu.MM.dd.HH.mm.ss" );
String output = zdt.format( formatter );
This particular format is ambiguous as to its exact meaning as it lacks any...
When to use enumerateObjectsUsingBlock vs. for
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@VanDuTran Blocks are only executed on a separate thread if you tell them to be executed on a separate thread. Unless you use the concurrency option of enumeration, then it'll be executed on the same thread as the call was made
– bbum
J...
What is an idempotent operation?
... then uses the HTTP verbs of POST, PUT, GET, and DELETE to create, update, read, and delete those resources.
Idempotence plays an important role in REST. If you GET a representation of a REST resource (eg, GET a jpeg image from Flickr), and the operation fails, you can just repeat the GET again an...
Using semicolon (;) vs plus (+) with exec in find
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I can read the man page too. And I did, but I don't think I understand the difference between using ; vs +
– Ankur Agarwal
May 22 '11 at 0:01
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How/When does Execute Shell mark a build as failure in Jenkins?
...them, as they are the ones that could be causing failure.
Finally, have a read here Jenkins Build Script exits after Google Test execution. It is not directly related to your question, but note that part about Jenkins launching the Execute Shell build step, as a shell script with /bin/sh -xe
The -...
Is there a “not in” operator in JavaScript for checking object properties?
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As already said by Jordão, just negate it:
if (!(id in tutorTimes)) { ... }
Note: The above test if tutorTimes has a property with the name specified in id, anywhere in the prototype chain. For example "valueOf" in tutorTimes ...
How do I shutdown, restart, or log off Windows via a bat file?
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Do read about using -f (for force) in the next answer. Says the guy who didn't and now has a computer stuck on shutdown on the other side of the planet during the weekend (:
– pasx
Aug 31 '...
Java concurrency: Countdown latch vs Cyclic barrier
I was reading through the java.util.concurrent API , and found that
14 Answers
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The current branch is not configured for pull No value for key branch.master.merge found in configur
...he answer here. Quite frankly, I don't see what all the hype is about. I'm ready to move back to Subversion.
– jmort253
Mar 14 '12 at 5:27
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