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What is the difference between the HashMap and Map objects in Java?

...eMap instead of HashMap in Foo. I update Foo, changing HashMap to TreeMap. Now, SpecialFoo doesn't compile anymore, because I've broken the contract: Foo used to say it provided HashMaps, but now it's providing TreeMaps instead. So we have to fix SpecialFoo now (and this kind of thing can ripple thr...
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Templated check for the existence of a class member function?

... return 0; } I've just tested it with Linux and gcc 4.1/4.3. I don't know if it's portable to other platforms running different compilers. share | improve this answer | ...
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How to format Joda-Time DateTime to only mm/dd/yyyy?

... DateTime date = DateTime.now().withTimeAtStartOfDay(); date.toString("HH:mm:ss") share | improve this answer | follow ...
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What does void mean in C, C++, and C#?

...hing Generic data pointer: void* data -- 'data' is a pointer to data of unknown type, and cannot be dereferenced Note: the void in a function argument is optional in C++, so int myFunc() is exactly the same as int myFunc(void), and it is left out completely in C#. It is always required for a retur...
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ruby 1.9: invalid byte sequence in UTF-8

...?)"/i) instead of nokogiri/hpricot (major speedup). The problem is that I now receive a lot of " invalid byte sequence in UTF-8 " errors. From what I understood, the net/http library doesn't have any encoding specific options and the stuff that comes in is basically not properly tagged. What ...
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How to print a dictionary line by line in Python?

... I know this is old, but I thought it would be worth mentioning that this doesn't work if cars[x] is integers. It isn't what the OP was requesting, so I'm just saying it for anybody that stumbles upon this assuming it's a blanket...
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Deleting queues in RabbitMQ

I have a few queues running with RabbitMQ. A few of them are of no use now, how can I delete them? Unfortunately I had not set the auto_delete option. ...
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One line ftp server in python

... Right, I do deserve down-voting, but really, people should know Twisted. And of course Twisted is in the base install of many Linuxes. – Ali Afshar Feb 14 '11 at 17:42 ...
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Restore Eclipse subversion project connection

...pository from inside Eclipse. All was well for some weeks then for some unknown reason, Eclipse (specifically: subclipse in Ganymede) no longer recognizes my project as being under svn control. The team context-menu only shows the basic "apply patch" / "share this project" menu options. From the she...
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outline on only one border

...nset border into an HTML element, but just only on one side of it. Until now, I've been using an image to do that (GIF/PNG) that I would then use as a background and stretch it (repeat-x) and position a little off from the top of my block. Recently, I discovered the outline CSS property, which i...