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Creating Unicode character from its number
...re either only support unicode up to U+FFFF (the answers dealing with just one instance of char) or don't tell how to get to the actual symbol (the answers stopping at Character.toChars() or using incorrect method after that), so adding my answer here, too.
To support supplementary code points also...
Celery Received unregistered task of type (run example)
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celeryd is obsolete. Now one should run celery worker e.g for Django like this celery --app=your_app.celery worker --loglevel=info
– andilabs
Jan 14 '16 at 11:25
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When should the volatile keyword be used in C#?
Can anyone provide a good explanation of the volatile keyword in C#? Which problems does it solve and which it doesn't? In which cases will it save me the use of locking?
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Specify multiple attribute selectors in CSS
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It's worth noting that at least one of the attribute values must be quoted. This would fail if you wrote it as input[name=Sex][value=M] even though it would be valid to have a selector with only one attribute that didn't use quotes.
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Get the new record primary key ID from MySQL insert query?
Let's say I am doing a MySQL INSERT into one of my tables and the table has the column item_id which is set to autoincrement and primary key .
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MySQL Cannot drop index needed in a foreign key constraint
...e
DROP KEY AID ;
gives error.
You can drop the index and create a new one in one ALTER TABLE statement:
ALTER TABLE mytable
DROP KEY AID ,
ADD UNIQUE KEY AID (AID, BID, CID, DID);
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CSS Child vs Descendant selectors
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One important note is that a child selector is going to be faster than descendant selector, which can have a visible affect on pages with 1000's of DOM elements.
– Jake Wilson
Mar 22 '12...
Error: Could not create the Java Virtual Machine Mac OSX Mavericks
...7 at the same time.
So try uninstalling all other versions other than the one you need, then set the JAVA_HOMEpath variable for that JDK remaining, and you're done.
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How can I combine two HashMap objects containing the same types?
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If you get a NPE, then apparently you did not initialize one of your objects properly. Do you print the stacktrace in the catch block? So you know where the problem arises. But unless you post the full and exact code including the stack trace you will need to track that down on you...
Stopwatch vs. using System.DateTime.Now for timing events [duplicate]
... is to just pick the top X of N runs. Like run it 5 times and use the best one. This is the one that will have the least OS interference after all. There's pros and cons to both approaches however
– mirhagk
Jan 2 '17 at 23:06
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