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Downcasting in Java
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Downcasting is allowed when there is a possibility that it succeeds at run time:
Object o = getSomeObject(),
String s = (String) o; // this is allowed because o could reference a String
In some cases this will not succeed:
Object o = new Object();
String s = (String) ...
Bogus foreign key constraint fail
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Two possibilities:
There is a table within another schema ("database" in mysql terminology) which has a FK reference
The innodb internal data dictionary is out of sync with the mysql one.
You can see which table it was (one of them, ...
How do I delete multiple rows in Entity Framework (without foreach)
I'm deleting several items from a table using Entity Framework. There isn't a foreign key / parent object so I can't handle this with OnDeleteCascade.
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How to iterate over arguments in a Bash script
...e a complex command that I'd like to make a shell/bash script of. I can write it in terms of $1 easily:
8 Answers
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Clearing purchases from iOS in-app purchase sandbox for a test user
...mail address, password, secret question, secret answer, date of birth, and iTunes store country. You can put exactly the same data (including password) for tester+01@gmail.com and tester+02@gmail.com and you will have two test accounts. Finally, in your tester@gmail.com inbox you will receive two ...
How to reload/refresh an element(image) in jQuery
Is it possible to reload an image with an identical file name from a server using jQuery?
12 Answers
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Why no ICloneable?
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ICloneable is considered a bad API now, since it does not specify whether the result is a deep or a shallow copy. I think this is why they do not improve this interface.
You can probably do a typed cloning extension method, but I think it would require a different name ...
How do I get current date/time on the Windows command line in a suitable format for usage in a file/
Update: Now that it's 2016 I'd use PowerShell for this unless there's a really compelling backwards-compatible reason for it, particularly because of the regional settings issue with using date . See @npocmaka's https://stackoverflow.com/a/19799236/8479
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Detect if Android device has Internet connection
...o network available!");
}
return false;
}
Of course you can substitute the http://www.google.com URL for any other server you want to connect to, or a server you know has a good uptime.
As Tony Cho also pointed out in this comment below, make sure you don't run this code on the main threa...
Ship an application with a database
If your application requires a database and it comes with built in data, what is the best way to ship that application? Should I:
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