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How to maintain a Unique List in Java?
... no duplicate elements. More formally, sets contain no pair of elements e1 and e2 such that e1.equals(e2), and at most one null element. As implied by its name, this interface models the mathematical set abstraction.
Note: Great care must be exercised if mutable objects are used as set elements...
How do I use reflection to call a generic method?
...rs public instance methods by default, so you may need BindingFlags.Static and/or BindingFlags.NonPublic.
– user565869
Dec 16 '11 at 22:32
20
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How to drop a PostgreSQL database if there are active connections to it?
...s will drop existing connections except for yours:
Query pg_stat_activity and get the pid values you want to kill, then issue SELECT pg_terminate_backend(pid int) to them.
PostgreSQL 9.2 and above:
SELECT pg_terminate_backend(pg_stat_activity.pid)
FROM pg_stat_activity
WHERE pg_stat_activity.datn...
Git will not init/sync/update new submodules
...rl should do the trick. One can cross check this by
git config --list
and one should get an entry of the submodule you want to pull in the result of the git config --list command. If there is an entry of your submodule in the config result, then now the usual git submodule update --init should ...
How to Deep clone in javascript
...first, a code example which clones object literals, any primitives, arrays and DOM nodes.
function clone(item) {
if (!item) { return item; } // null, undefined values check
var types = [ Number, String, Boolean ],
result;
// normalizing primitives if someone did new String('a...
What is the difference between a shim and a polyfill?
...
A shim is any piece of code that performs interception of an API call and provides a layer of abstraction. It isn't necessarily restricted to a web application or HTML5/CSS3.
A polyfill is a type of shim that retrofits legacy browsers with modern HTML5/CSS3 features usually using Javascript or ...
Relationship between hashCode and equals method in Java [duplicate]
...ctions where unicity of elements is calculated according to both .equals() and .hashCode(), for instance keys in a HashMap.
As its name implies, it relies on hash tables, and hash buckets are a function of the object's .hashCode().
If you have two objects which are .equals(), but have different ha...
How can I run dos2unix on an entire directory? [closed]
...args -0 dos2unix
Will recursively find all files inside current directory and call for these files dos2unix command
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JavaScript for detecting browser language preference [duplicate]
...ears this value is not available through javascript at all. (Probably why @anddoutoi states he can't find a reference for it that doesn't involve server side.)
I have coded a workaround: I've knocked up a google app engine script at http://ajaxhttpheaders.appspot.com that will return you the HTTP r...
What is the difference between the states selected, checked and activated in Android?
...
The difference between Checked and Activated is actually quite interesting. Even the Google documentation is apologetic (emphasis below added):
... For example, in a list view with single or multiple selection
enabled, the views in the current selec...