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What is a covariant return type?
... to be a subtype of the overridden method's return type.
To clarify this with an example, a common case is Object.clone() - which is declared to return a type of Object. You could override this in your own class as follows:
public class MyFoo
{
...
// Note covariant return here, method do...
Placement of the asterisk in pointer declarations
...ng I do not really understand about pointers or more precisely, their definition.
12 Answers
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With CSS, use “…” for overflowed block of multi-lines
with
16 Answers
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How can you do anything useful without mutable state?
...of stuff about functional programming lately, and I can understand most of it, but the one thing I just can't wrap my head around is stateless coding. It seems to me that simplifying programming by removing mutable state is like "simplifying" a car by removing the dashboard: the finished product ma...
How can I pretty-print JSON in a shell script?
...
With Python 2.6+ you can just do:
echo '{"foo": "lorem", "bar": "ipsum"}' | python -m json.tool
or, if the JSON is in a file, you can do:
python -m json.tool my_json.json
if the JSON is from an internet source such as ...
What's wrong with foreign keys?
... a foreign key (if I remember correctly). However, to me they seem pretty vital to avoid duplication and subsequent data integrity problems throughout your database.
...
You have already activated rake 0.9.0, but your Gemfile requires rake 0.8.7
...
First, check to make sure that rake is mentioned in your Gemfile. If it's not, add it, and specify the version "you already activated".
Then, you'll need to tell bundle to update the rake version it's using for your app:
bundle update rake
It'll update your Gemfile.lock for you.
...
How to list the files inside a JAR file?
...e == null)
break;
String name = e.getName();
if (name.startsWith("path/to/your/dir/")) {
/* Do something with this entry. */
...
}
}
}
else {
/* Fail... */
}
Note that in Java 7, you can create a FileSystem from the JAR (zip) file, and then use NIO's directory wa...
Is embedding background image data into CSS as Base64 good or bad practice?
...
It's not a good idea when you want your images and style information to be cached separately. Also if you encode a large image or a significant number of images in to your css file it will take the browser longer to download...
Can an abstract class have a constructor?
...n the parent
abstract class, the constructor used in subclass must explicitly call
the parent constructor.
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