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Java generics - why is “extends T” allowed but not “implements T”?

I wonder if there is a special reason in Java for using always " extends " rather than " implements " for defining bounds of typeparameters. ...
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Iterate over each line in a string in PHP

...e user to either upload a text file or copy/paste the contents of the file into a textarea. I can easily differentiate between the two and put whichever one they entered into a string variable, but where do I go from there? ...
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How do you get the logical xor of two variables in Python?

How do you get the logical xor of two variables in Python? 24 Answers 24 ...
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How can I do division with variables in a Linux shell?

When I run commands in my shell as below, it returns an expr: non-integer argument error. Can someone please explain this to me? ...
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Custom method names in ASP.NET Web API

I'm converting from the WCF Web API to the new ASP.NET MVC 4 Web API. I have a UsersController, and I want to have a method named Authenticate. I see examples of how to do GetAll, GetOne, Post, and Delete, however what if I want to add extra methods into these services? For instance, my UsersService...
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“Too many values to unpack” Exception

I'm working on a project in Django and I've just started trying to extend the User model in order to make user profiles. 5...
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.gitignore exclude folder but include specific subfolder

I have the folder application/ which I add to the .gitignore . Inside the application/ folder is the folder application/language/gr . How can I include this folder? ...
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How to randomize (shuffle) a JavaScript array?

...oolaj86/knuth-shuffle You can see a great visualization here (and the original post linked to this) function shuffle(array) { var currentIndex = array.length, temporaryValue, randomIndex; // While there remain elements to shuffle... while (0 !== currentIndex) { // Pick a rema...
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How can I read inputs as numbers?

Why are x and y strings instead of ints in the below code? 10 Answers 10 ...
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SQL: IF clause within WHERE clause

Is it possible to use an IF clause within a WHERE clause in MS SQL? 14 Answers 14 ...