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Why are arrays covariant but generics are invariant?
...th a List<Animal> - you can add any animal to it... including a cat. Now, can you logically add a cat to a litter of puppies? Absolutely not.
// Illegal code - because otherwise life would be Bad
List<Dog> dogs = new List<Dog>();
List<Animal> animals = dogs; // Awooga awooga...
What is the meaning of “$” sign in JavaScript
... @Paolo: Often, yes. There was however no indication the OP wanted to know about this. A direct answer is also a good thing. :) Saying that, I would still agree this is a better answer. My only quibble was with the emphasis you were placing on a specific point.
– Noldorin
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How to throw a C++ exception
...pretty important - because it highlights the fact it is a temporary object now - so modification is useless.
– Adrian Cornish
Dec 12 '11 at 21:03
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Java: Calling a super method which calls an overridden method
... super doesn't change the instance. It doesn't set some hidden field "from now on, all method calls should start using SuperClass". Or to put it another way: The value of this doesn't change.
– Aaron Digulla
Oct 2 '14 at 11:36
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font-style: italic vs oblique in CSS
...not to be italicized or obliqued... but people did anyway. And as you may know, some operating systems will, upon clicking the 'italic' icon, skew the font and create an oblique on the fly. Not a pleasant sight.
It's best to specify an italic only when you're sure that font has been designed with o...
Keystore type: which one to use?
...'t have the private key for them).
This has changed in Java 8, so you can now have certificate-only entries in PKCS12 stores too. (More details about these changes and further plans can be found in JEP 229: Create PKCS12 Keystores by Default.)
There are a few other keystore types, perhaps less fre...
Reference one string from another string in strings.xml?
...g>
<string name="string_default">@string/string1</string>
Now you can use string_default everywhere in your code and you can easily change the default at any time.
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Securing my REST API with OAuth while still allowing authentication via third party OAuth providers
...ice provider, where the user first authenticates (so the service provider knows who its talking to) and then the user says to the site "yes, it's ok for [application] to access my data [in some restricted way]". From then on, the application uses an authorization token to access the user data on th...
getViewTypeCount and getItemViewType methods of ArrayAdapter
...the view, exiting getView, and your row's view is displayed to the user.
Now, when a view is recycled by scrolling off the screen it goes into a recycled views pool that is managed by the framework. These are essentially organized by view type so that a view of the correct type is given to you in ...
Java equivalent of unsigned long long?
... 64 bit unsigned integer, via unsigned long long int , or via uint64_t . Now, in Java longs are 64 bits, I know. However, they are signed.
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