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What is difference between XML Schema and DTD?
...
From the Differences Between DTDs and Schema section of the Converting a DTD into a Schema article:
The critical difference between DTDs
and XML Schema is that XML Schema
utilize an XML-based syntax, whereas
DTDs ha...
Why does one use dependency injection?
...has a logger to use, but it does not know any more where this logger comes from.
And this is where a DI framework comes into play: You configure your mappings once again, and then ask your DI framework to instantiate your application for you. As the Application class requires an ICanPersistData imp...
Amazon SimpleDB vs Amazon DynamoDB
...This is addressed by the respective FAQ Q: How does Amazon DynamoDB differ from Amazon SimpleDB? Which should I use? (hash link no longer works, but use in-page Find to locate question within page) to some extent already, with the most compact summary at the end of the paragraph:
While SimpleDB ...
What is the volatile keyword useful for?
...le, which will instruct JVM threads to read the value of volatile variable from main memory and don’t cache it locally.
If a variable is not shared between multiple threads then there is no need to use the volatile keyword.
source
Example usage of volatile:
public class Singleton {
private...
PHP Fatal error: Using $this when not in object context
...lass member, while $foo is just a variable in the function scope (imported from global scope). Function names with the same name as a member are also not an issue.
– Gordon
Feb 28 '10 at 12:08
...
What are the differences between a UIView and a CALayer?
... that it can be very easily ported to the Mac. UIViews are very different from NSViews, but CALayers are almost identical on the two platforms. This is why the Core Plot framework lays out its graphs using CALayers instead of other UI elements.
One thing UIViews provide over CALayers is built-in ...
Difference in System. exit(0) , System.exit(-1), System.exit(1 ) in Java
... if the execution of the program went good or bad. It's a sort of heredity from older programming languages where it's useful to know if something went wrong and what went wrong.
Exit code is
0 when execution went fine;
1, -1, whatever != 0 when some error occurred, you can use different values f...
Rails 3.1 and Image Assets
... stuff that's driving me crazy as a dude trying to learn Rails having come from other web development frameworks.
– jn29098
Aug 4 '12 at 12:36
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When should assertions stay in production code? [closed]
...mments, which is a helpful way of thinking about them. They are a step up from comments because they are constantly machine tested during development, but they should always be meaningful to human readers first. Just like comments, they should not be part of logic or final execution. Just like co...
How do HashTables deal with collisions?
...tries
Incremental resizing
Monotonic keys
EDIT: the above are borrowed from wiki_hash_table, where you should go to have a look to get more info.
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