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When to use enumerateObjectsUsingBlock vs. for
... support to implement enumeration). Fast enumeration requires translation from an internal representation to the representation for fast enumeration. There is overhead therein. Block-based enumeration allows the collection class to enumerate contents as quickly as the fastest traversal of the nat...
spring scoped proxy bean
...property name="userPreferences" ref="userPreferences"/>
</bean>
From the above configuration it is evident that the singleton bean 'userManager' is being injected with a reference to the HTTP Session-scoped bean 'userPreferences'. The salient point here is that the 'userManager' bean is a...
How to return multiple values? [duplicate]
Is it possible to return two or more values from a method to main in Java? If so, how it is possible and if not how can we do?
...
onCreateOptionsMenu inside Fragments
...our app displays the Fragment, its menu will contain 3 entries:
action_1 from res/menu/fragment_menu.xml
action_2 from res/menu/fragment_menu.xml
action_settings from res/menu/menu.xml
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im...
Ruby : How to write a gem? [closed]
...g Rubygem projects. There's also a Gemcutter and Jeweler Railscast.
Hoe - From the guys at seattlrb.
gem-this adds a bunch of helpful rake tasks.
Some tutorials/guides:
Creating Your First Gem
Using bundler and rvm to build a rubygem - Using bundler and rvm to create a gem
Gem Packaging: Best P...
Read/write to Windows registry using Java
...e.
For example, the following code obtains the exact windows distribution from the registry:
String value = WinRegistry.readString (
WinRegistry.HKEY_LOCAL_MACHINE, //HKEY
"SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion", //Key
"ProductName"); ...
Git command to display HEAD commit id?
... using these commands in a (large) git repo, I get two lines from git show-ref --heads and 6290 lines from git show-ref --head. so if you want just a single hash, this gives maybe not the intended result.
– Remigius Stalder
Jun 15 '17 at 8:47
...
RabbitMQ / AMQP: single queue, multiple consumers for same message?
...s it normally configured?
No, not if the consumers are on the same queue. From RabbitMQ's AMQP Concepts guide:
it is important to understand that, in AMQP 0-9-1, messages are load balanced between consumers.
This seems to imply that round-robin behavior within a queue is a given, and not conf...
Calculate distance between two latitude-longitude points? (Haversine formula)
...s surface – using the
‘Haversine’ formula.
function getDistanceFromLatLonInKm(lat1,lon1,lat2,lon2) {
var R = 6371; // Radius of the earth in km
var dLat = deg2rad(lat2-lat1); // deg2rad below
var dLon = deg2rad(lon2-lon1);
var a =
Math.sin(dLat/2) * Math.sin(dLat/2) +
Ma...
Android Fragments: When to use hide/show or add/remove/replace?
...ill be in the running state of its lifecycle, but its UI has been detached from the window so it's no longer visible. So you could technically still interact with the fragment and reattach its UI later you need to. If you replace the fragment, the you are actually pulling it out of the container a...