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What does the ^ operator do in Java?
...--- xor
3 = 011
This the truth table for bitwise (JLS 15.22.1) and logical (JLS 15.22.2) xor:
^ | 0 1 ^ | F T
--+----- --+-----
0 | 0 1 F | F T
1 | 1 0 T | T F
More simply, you can also think of xor as "this or that, but not both!".
See also
Wikipedia: exclusive-...
Is it possible to focus on a using JavaScript focus() function?
...e correct answer. in my case, I want to focus on an 'contentEditable' div, and your trick doesn't help.
– arnaudambro
Jun 6 '18 at 13:40
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Is there an XSLT name-of element?
...y did point the subtle difference in the semantics of the functions name() and local-name().
name(someNode) returns the full
name of the node, and that includes
the prefix and colon in case the node
is an element or an attribute.
local-name(someNode) returns only
the local name of the node, and th...
One-liner to recursively list directories in Ruby?
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What about hidden files and directories?
– alediaferia
Aug 30 '12 at 10:20
6
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Is a Java hashmap search really O(1)?
I've seen some interesting claims on SO re Java hashmaps and their O(1) lookup time. Can someone explain why this is so? Unless these hashmaps are vastly different from any of the hashing algorithms I was bought up on, there must always exist a dataset that contains collisions.
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Kill child process when parent process is killed
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From this forum, credit to 'Josh'.
Application.Quit() and Process.Kill() are possible solutions, but have proven to be unreliable. When your main application dies, you are still left with child processes running. What we really want is for the child processes to die as soon as t...
How to loop over directories in Linux?
I am writing a script in bash on Linux and need to go through all subdirectory names in a given directory. How can I loop through these directories (and skip regular files)?
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Javascript add leading zeroes to date
...ers of the string.
So no matter what, we can add "0" to the day or month, and just ask for the last two since those are always the two we want.
So if the MyDate.getMonth() returns 9, it will be:
("0" + "9") // Giving us "09"
so adding .slice(-2) on that gives us the last two characters which is...
How do you update Xcode on OSX to the latest version?
...Store
Look in the top right for the updates section (may also be in lefthand column "Updates"..)
Find Xcode & click Update
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Calculate a MD5 hash from a string
...the following C# code to calculate a MD5 hash from a string.
It works well and generates a 32-character hex string like this:
900150983cd24fb0d6963f7d28e17f72
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