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What is the difference between instanceof and Class.isAssignableFrom(…)?
...ation, it might be possible to get a different result (and maybe different order!) on a different JAVA version and/or platforms like Solaris, Mac or Linux.
the benchmark compares the performance of "is B an instance of A" when "B extends A" directly. If the class hierarchy is deeper and more complex...
How do CSS triangles work?
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CSS Triangles: A Tragedy in Five Acts
As alex said, borders of equal width butt up against each other at 45 degree angles:
When you have no top border, it looks like this:
Then you give it a width of 0...
...and a height of 0...
...and finally, you make the two side...
Form inside a table
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Fixing slow initial load for IIS
...er are served fast (restarting the app pool takes quite some time - in the order of seconds).
As far as I know, the timeout exists to save memory that other websites running in parallel on that machine might need. The price being that one time slow load time.
Besides the fact that the app pool get...
What is a good Hash Function?
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Hsieh's hash function is awful, with an order of magnitude more collisions than we want. In particular, strings that differ only in the last 4 bytes can collide easily. If you have a 30 character string, that differ in the last 4 bytes, after 28 bytes have been pro...
Array versus linked-list
...t, i.e. that data structure that allows duplicate elements in an arbitrary order, that’s not suitable and you would have to go great lengths to make a data structure like LinkedList a concurrently updatable thing. If you only need a concurrent queue or deque, well yes, there are even existing exam...
error opening HPROF file: IOException: Unknown HPROF Version
...s directory nevertheless. I had to chmod permissions in that directory in order for it to work.
– IgorGanapolsky
Feb 23 '12 at 23:56
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Why can't I use an alias in a DELETE statement?
...ble to other tables/views to get a reduced set of rows. E.g. delete o from Order as o inner join Customer as c on c.CustomerID = o.CustomerID where c.ArchiveOrders = 1
– Andrew Jens
Aug 31 '17 at 2:03
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Collections.emptyMap() vs new HashMap()
... then returning a view to the underlying collection makes perfect sense in order to make sure that a "bad" client does not accidentally modify collections owned by you. Returning an empty collection instead of null means that your client does not have to make a null check before using the collection...
'App not Installed' Error on Android
... version of my App1 (note the original App1 was at the top in Alphabetical order which was deleted as above). When clicking on the pale version it said "Not installed for this user". (I had set up my nexus to have more than one user). But in the top right corner there is a three dot button. I presse...