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Creating a “logical exclusive or” operator in Java
...me result. Therefore, no need for distinct operators. The simplified truth table for a XOR operator is X ^ !X = 1. You cannot short circuit an input in XOR because you have to determine whether the inputs are different. It is a lot easier to understand if you know the fabrication of the actual XOR g...
Concrete Javascript Regex for Accented Characters (Diacritics)
...öø-ÿ] // as above but not including [ ] ^ \ × ÷
See https://unicode-table.com/en/ for characters listed in numeric order.
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How to reset or change the MySQL root password?
...init.d/mysql stop
Start the mysqld configuration: sudo mysqld --skip-grant-tables &
In some cases, you've to create the /var/run/mysqld first:
sudo mkdir -v /var/run/mysqld && sudo chown mysql /var/run/mysqld
Run: sudo service mysql start
Login to MySQL as root: mysql -u root mysql
Re...
Detecting when the 'back' button is pressed on a navbar
...s run through an example. Say you have three view controllers:
ListVC: A table view of things
DetailVC: Details about a thing
SettingsVC: Some options for a thing
Lets follow the calls on the detailVC as you go from the listVC to settingsVC and back to listVC
List > Detail (push detailVC) De...
How to use GROUP BY to concatenate strings in MySQL?
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SELECT id, GROUP_CONCAT(name SEPARATOR ' ') FROM table GROUP BY id;
http://dev.mysql.com/doc/refman/5.0/en/group-by-functions.html#function_group-concat
From the link above, GROUP_CONCAT: This function returns a string result with the concatenated non-NULL values from a ...
Can I position an element fixed relative to parent? [duplicate]
...cases. It is currently a working draft, and has decent support, aside from table elements. position: sticky still needs a -webkit prefix in Safari.
See caniuse for up-to-date stats on browser support.
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HTML5 LocalStorage: Checking if a key exists [duplicate]
...'s worth noting that the constraints FF (28.0) imposes on its localStorage table allows null values: CREATE TABLE webappsstore2 (scope TEXT, key TEXT, value TEXT, secure INTEGER, owner TEXT) while Chrome does not: CREATE TABLE ItemTable (key TEXT UNIQUE ON CONFLICT REPLACE, value BLOB NOT NULL ON CO...
Is it safe to ignore the possibility of SHA collisions in practice?
...ssing on the so-called "birthday paradox". Have a better look at the "nice table", it does not work the way you think. For the figures I give, in that table, it would be a value "10^9" in a column labelled "4.3*10^-60" and row "128 bits" (but the table does not go below 10^-18).
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Is there more to an interface than having the correct methods
...Another common use of interfaces is for Callbacks. For example, java.swing.table.TableCellRenderer, which allows you to influence how a Swing table displays the data in a certain column. You implement that interface, pass an instance to the JTable, and at some point during the rendering of the table...
What version of javac built my jar?
...iszewski' https://stackoverflow.com/a/3313839/1497139 class number version table to create a bash script jarv to show the versions of all class files in a jar file.
usage
usage: ./jarv jarfile
-h|--help: show this usage
Example
jarv $Home/.m2/repository/log4j/log4j/1.2.17/log4j-1.2.17.jar
jav...