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Is List a subclass of List? Why are Java generics not implicitly polymorphic?
...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 ArrayList<Dog>(); // ArrayList implements List
List<Animal>...
Is JavaScript supported in an email message?
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Wow, these clients are now so old the links on how they used to behave are dying out, I can't confirm or deny any of it. Six years later, I'd be surprised if there is a single email client still in use that has any sort of script execution enabled ...
Cleaner way to do a null check in C#? [duplicate]
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Console.WriteLine(new BusinessCalculator().CalculateCents());
}
}
Now, if you make either of the above changes, you only have to refactor one more piece of code, the BusinessCalculator.CalculateCents() method. You've also eliminated BusinessController's dependency on BusinessData.
Your c...
What requirement was the tuple designed to solve?
...ff and write a class, and just want to think about what I've writing right now. Which means the signature of the Tuple may change quite a lot in the text half an hour whilst I figure out what data I am going to need for this method, and how it's returning what ever values it will return.
If I get ...
C++ error: undefined reference to 'clock_gettime' and 'clock_settime'
...em to get this to work. It works fine on my school computers and I don't know what I am not doing. I have checked usr/include and time.h is there just fine. Here is the code:
...
what is the basic difference between stack and queue?
...or arguments sake, what if I want the first pancake added to the plate? I know this can be completed with a stack.size() vs. if(!stack.isEmpty()), but still that first pancake might be the best one :)... Either way, nice answer and I agree this is the clearest...seems interesting that the British re...
Vim: Move window left/right?
... vertical split, then create a horizontal split within one of the columns. Now use <c-w> r and it only cycles the two windows within the one vertical split.
– Chev
Dec 19 '13 at 18:08
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How does origin/HEAD get set?
...otes/origin/HEAD.)
I think the above answers what you actually wanted to know, but to go ahead and answer the question you explicitly asked... origin/HEAD is set automatically when you clone a repository, and that's about it. Bizarrely, that it's not set by commands like git remote update - I belie...
What is the difference between Non-Repeatable Read and Phantom Read?
...ransaction reads committed UPDATES from another transaction. The same row now has different values than it did when your transaction began.
Phantom reads are similar but when reading from committed INSERTS and/or DELETES from another transaction. There are new rows or rows that have disappeared s...
WebSockets protocol vs HTTP
...each client to server message. - what about streaming of response body? i know, XMLHttpRequest API does not allow this, but it is exists. with streaming to the server you can stream from client side.
– 4esn0k
Feb 5 '13 at 16:48
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