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Look up all descendants of a class in Ruby
...That works great, thanks! I suppose visiting every class might be too slow if you're trying to shave milliseconds, but it's perfectly speedy for me.
– Douglas Squirrel
Mar 6 '10 at 20:01
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How to create a bash script to check the SSH connection?
...ou'll have to grep the message (nmap does not use the return-value to show if a port was filtered, closed or open).
EDIT2:
If you're interested in the actual state of the ssh-port, you can substitute grep open with egrep 'open|closed|filtered':
$ nmap host -PN -p ssh | egrep 'open|closed|filtered...
START_STICKY and START_NOT_STICKY
What is the difference between START_STICKY and START_NOT_STICKY while implementing services in android? Could anyone point out to some standard examples.. ?
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Why does direction of index matter in MongoDB?
...finding single items - The order of the nodes in the tree is irrelevant.
If you are returning a range of nodes - The elements close to each other will be down the same branches of the tree. The closer the nodes are in the range the quicker they can be retrieved.
With a single field index - The ...
MySQL Data - Best way to implement paging?
...hen using prepared statements).
With two arguments, the first argument specifies the offset of the first row to return, and the second specifies the maximum number of rows to return. The offset of the initial row is 0 (not 1):
SELECT * FROM tbl LIMIT 5,10; # Retrieve rows 6-15
To retrieve all rows...
How to restart Activity in Android
...ivity.recreate() is the way to go in API 11 and beyond. This is preferable if you're in an API11+ environment. You can still check the current version and call the code snippet above if you're in API 10 or below. (Please don't forget to upvote Ralf's answer!)
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Easiest way to detect Internet connection on iOS?
...rry background, making requests through HTTPUrlConnection instantly fail if there is no connection available. This seems like completely sane behavior, and I was surprised to find NSURLConnection in iOS did not emulate it.
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Proper usage of Optional.ifPresent()
I am trying to understand the ifPresent() method of the Optional API in Java 8.
5 Answers
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Is it good practice to use the xor operator for boolean checks? [closed]
...What @RobertGrant said). Most humans would understand the first one easier if they know what xor is (which is pretty useful to know if you're in the field of computing...)
– Harold R. Eason
Nov 22 '13 at 20:53
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Something like 'contains any' for Java set?
... Collections.disjoint(A, B) work? From the documentation:
Returns true if the two specified collections have no elements in common.
Thus, the method returns false if the collections contains any common elements.
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