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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...
git --git-dir not working as expected
...
You have to define the working dir as well. Confusing I know but it's a flexibility thing.
git --git-dir=/mycode/.git --work-tree=/mycode status
You can read a little more here
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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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How to pass arguments and redirect stdin from a file to program run in gdb?
...; <(in) 1> >(out) 2> >(two) 3> >(three)
That's it. Now it's an absolute no-brainer to debug with gdb. Except for a few details or more:
gdb does not quit automatically and hence keeps the IO redirection open until you exit gdb. But I call this a feature.
You cannot easily...
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...
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...
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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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...
How to create a custom-shaped bitmap marker with Android map API v2 [duplicate]
...t by looking at the Canvas and Drawables from the Android Developer page.
Now you also want to download a picture from an URL.
URL url = new URL(user_image_url);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setDoInput(true);
conn.connect();
InputStream is = co...
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 ...