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Why static classes cant implement interfaces? [duplicate]

In my application I want to use a Repository that will do the raw data access ( TestRepository , SqlRepository , FlatFileRepository etc). Because such a repository would be used throughout the runtime of my application it seemed like a sensible thing to me to make it a static class so I could go ...
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How do I put a variable inside a string?

I would like to put an int into a string . This is what I am doing at the moment: 8 Answers ...
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How can I calculate an md5 checksum of a directory?

I need to calculate a summary md5 checksum for all files of a particular type ( *.py for example) placed under a directory and all sub-directories. ...
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How do I contribute to other's code in GitHub? [closed]

I would like to contribute to a certain project in GitHub . Should I fork it? Branch it? What is recommended and how to do it? ...
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Send message to specific client with socket.io and node.js

I'm working with socket.io and node.js and until now it seems pretty good, but I don't know how to send a message from the server to an specific client, something like this: ...
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Core Data vs SQLite 3 [closed]

I am already quite familiar with relational databases and have used SQLite (and other databases) in the past. However, Core Data has a certain allure, so I am considering spending some time to learn it for use in my next application. ...
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I need to store postal codes in a database. How big should the column be?

I expect the column to be a VARCHAR2, in my Oracle Database. 8 Answers 8 ...
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How to specify an element after which to wrap in css flexbox? [duplicate]

I don't think this is part of the flexbox standard yet, but is there maybe a trick to suggest or force wrapping after a certain element? I'd like to respond to different page sizes and wrap a list differently without extra markup, so that rather than having (for example) orphaned menu items on the n...
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What characters do I need to escape in XML documents?

What characters must be escaped in XML documents, or where could I find such a list? 9 Answers ...
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How do I create a dictionary with keys from a list and values defaulting to (say) zero? [duplicate]

I have a = [1,2,3,4] and I want d = {1:0, 2:0, 3:0, 4:0} 5 Answers 5 ...