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Why do this() and super() have to be the first statement in a constructor?
Java requires that if you call this() or super() in a constructor, it must be the first statement. Why?
19 Answers
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Inverse dictionary lookup in Python
...o guarantee that it returns a single value and it does not need to be lexically first only that it be the first match and that it's behavior is stable (multiple calls on same dict over time should yield same matching element). Unless dictionaries rearrange their unmodified hashes over time as other...
What is a regular expression which will match a valid domain name without a subdomain?
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This should match all cases I think: ^([a-z0-9])(([a-z0-9-]{1,61})?[a-z0-9]{1})?(\.[a-z0-9](([a-z0-9-]{1,61})?[a-z0-9]{1})?)?(\.[a-zA-Z]{2,4})+$
– transilvlad
May 16 '13 at 16:38
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Tactics for using PHP in a high-load site
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No two sites are alike. You really need to get a tool like jmeter and benchmark to see where your problem points will be. You can spend a lot of time guessing and improving, but you won't see real results until you measure and compare your changes.
For ...
Git keeps asking me for my ssh key passphrase
...-add
This will ask you your passphrase just once, and then you should be allowed to push, provided that you uploaded the public key to Github.
To save key permanently on macOS:
ssh-add -K
This will persist it after you close and re-open it by storing it in user's keychain.
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vs
...urns the character encoding you specified, not the encoding that IE is actually using."
– hotshot309
Jun 5 '12 at 13:51
7
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Bogus foreign key constraint fail
...each query (bugs.mysql.com/bug.php?id=8280), making it neccessary to write all the drop statements in one query, eg.
SET FOREIGN_KEY_CHECKS=0;
DROP TABLE my_first_table_to_drop;
DROP TABLE my_second_table_to_drop;
SET FOREIGN_KEY_CHECKS=1;
Where the SET FOREIGN_KEY_CHECKS=1 serves as an extr...
Regular Expression For Duplicate Words
...)\s+\b\1\b/
A good selection of test strings can be found here: http://callumacrae.github.com/regex-tuesday/challenge1.html
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How do you do a simple “chmod +x” from within python?
... non-pythonic answer that may be a little more readable: subprocess.check_call(['chmod', '+x', 'somefile']) and let's you more easily do operations like a+rx.
– Trevor Boyd Smith
Aug 6 at 15:28
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How to find serial number of Android device?
...ected by the ANDROID_ID bug in 2.2.
As far as I've been able to determine, all affected devices have the same ANDROID_ID, which is 9774d56d682e549c. Which is also the same device id reported by the emulator, btw.
Google believes that OEMs have patched the issue for many or most of their devices, bu...