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ConcurrentHashMap vs Synchronized HashMap
...ference between using the wrapper class, SynchronizedMap , on a HashMap and ConcurrentHashMap ?
12 Answers
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Android adb “Unable to open sync connection!”
I can run and debug my Android app on my phone just fine, most of the time. Then, seemingly randomly, when I try to run or debug my app from Eclipse, the Console in Eclipse says:
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Disable Laravel's Eloquent timestamps
...imestamps = false; in every model, or create a BaseModel, define it there, and have all your models extend it instead of eloquent. Just bare in mind pivot tables MUST have timestamps if you're using Eloquent.
Update: Note that timestamps are no longer REQUIRED in pivot tables after Laravel v3.
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How to change indentation mode in Atom?
...tabs instead though. Sublime Text has built in functionality for switching and converting indentation.
16 Answers
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Postgresql - unable to drop database because of some auto connections to DB
...revent future connections:
REVOKE CONNECT ON DATABASE thedb FROM public;
(and possibly other users/roles; see \l+ in psql)
You can then terminate all connections to this db except your own:
SELECT pid, pg_terminate_backend(pid)
FROM pg_stat_activity
WHERE datname = current_database() AND pid <...
How to mark a class as Deprecated? [duplicate]
...ey are optional (overloaded method). The first parameter is for the reason and the last one is to mark an Error in compile time instead of a warning.
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How to use “raise” keyword in Python [duplicate]
...ve read the official definition of "raise", but I still don't quite understand what it does.
6 Answers
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How to remove files from git staging area?
I made changes to some of my files in my local repo, and then I did git add -A which I think added too many files to the staging area. How can I delete all the files from the staging area?
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Gradle does not find tools.jar
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I had this problem when I was trying to run commands through CLI.
It was a problem with system looking at the JRE folder i.e.
D:\Program Files\Java\jre8\bin. If we look in there, there is no Tools.jar, hence the error.
You need to find where the JDK is, in my case: D:...
How do I convert array of Objects into one Object in JavaScript?
...e we benefit from comma operator, it evaluates all expression before comma and returns a last one(after last comma). So we don't copy obj each time, rather assigning new property to it.
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