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Why can't overriding methods throw exceptions broader than the overridden method?
... to catch this by the compiler
}
If B had decided to throw SQLException, then the compiler could not force you to catch it, because you are referring to the instance of B by its superclass - A. On the other hand, any subclass of IOException will be handled by clauses (catch or throws) that handle ...
Difference between onStart() and onResume()
...start driving and onPause() is when I come to a temporary stop. So I drive then reach a red light so I pause...the light goes green and I resume. Another red light and I pause, then green so I resume. The onPause() -> onResume() -> onPause() -> onResume() loop is a tight one and occurs many...
Django templates: verbose version of a choice
...field.
Note: in case the standard FormPreview templates are not using it, then you can always provide your own templates for that form, which will contain something like {{ form.get_meal_display }}.
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Is there a better way to find out if a local git branch exists?
...
exists=`git show-ref refs/heads/<branch-name>`
if [ -n "$exists" ]; then
echo 'branch exists!'
fi
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ImportError: No module named Crypto.Cipher
...
I had the same problem on my Mac when installing with pip. I then removed pycrypto and installed it again with easy_install, like this:
pip uninstall pycrypto
easy_install pycrypto
also as Luke commented: If you have trouble running these commands, be sure to run them as admin (sudo...
What is the difference between HTTP status code 200 (cache) vs status code 304?
...a far-future Expires: or Cache-Control: max-age header for all assets, and then when an asset needs to be changed, changing the actual filename of the asset or appending a version string to requests for that asset. This eliminates the need for any request to be made unless the asset has definitely c...
Why should I use the keyword “final” on a method parameter in Java?
...tally mistaking the argument variable as something other than an argument, then don’t bother. In my own work, I add final only in longer or more involved code where an argument might mistaken for a local or member variable.
Another case added for the completeness
public class MyClass {
priv...
ReactJS Two components communicating
...her scenarios that I'm not thinking of. If yours doesn't fit within these, then let me know. Here are some very rough examples of how I've been handling the first two scenarios:
Scenario #1
You could pass a handler from <List /> to <Filters />, which could then be called on the onChang...
Xml Namespace breaking my xpath! [duplicate]
...t use (assuming the registered prefix is "x"):
/x:List/x:Fields/x:Field
then there is another way:
/*[name()='List']/*[name()='Fields']/*[name()='Field']
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How to set environment variable or system property in spring tests?
...xt)
{
System.setProperty("myproperty", "value");
}
}
and then configure it on the test class in addition to the Spring context config file locations:
@ContextConfiguration(initializers = TestApplicationContextInitializer.class, locations = "classpath:whereever/context.xml", ...)
@...