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What is a covariant return type?
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Covariant return, means that when one overrides a method, the return type of the overriding method is allowed to be a subtype of the overridden method's return type.
To clarify this with an example, a common case is Object.clone() - which is declared to retu...
How can I reload .emacs after changing it?
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Very strange that the very convenient
M-x eval-buffer
is not mentioned here.
It immediately evaluates all code in the buffer, its the quickest method, if your .emacs is idempotent.
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Why are C# 4 optional parameters defined on interface not enforced on implementing class?
...describe, and a hundred classes that implement it. Then you decide to make one of the parameters of one of the interface's methods optional. Are you suggesting that the right thing to do is for the compiler to force the developer to find every implementation of that interface method, and make the pa...
Eclipse - debugger doesn't stop at breakpoint
...es: 1) in a line where a static member is initialized 2) the first line of one of the test cases.
22 Answers
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How to construct a relative path in Java from two absolute paths (or URLs)?
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public class ResourceUtils {
/**
* Get the relative path from one file to another, specifying the directory separator.
* If one of the provided resources does not exist, it is assumed to be a file unless it ends with '/' or
* '\'.
*
* @param targetPath targetPath i...
Measure elapsed time in Swift
... me, it returns 0.0114653027 which i know for a fact that is not true, the one with dates returns 4.77720803022385sec
– Cristi Băluță
Nov 17 '16 at 17:13
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How do you test a public/private DSA keypair?
...k server has a few dozen id_rsa.pub.blahhost files and I didn't know which one matched the lone id_rsa private key & I'm setting up passwordless scp so I can migrate off old websites. Making a new key pair is not an option; I've got my keys set up well and not going to mess that up.
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Join a list of items with different types as string in Python
...hem. For example, if you have a list of integers then you can convert them one by one in a for-loop and join them with ,:
print(','.join(str(x) for x in list_of_ints))
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http to https apache redirection
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This is a better solution than the approved one, because it works even if you are behind an SSL offloader like Pound or BigIP. Those offloader will often pass all the traffic onto the same port,and the approved solution won't work in that specific case
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Is there a /dev/null on Windows?
...write in code, and the error was getting swallowed. I'm deleting it so no one accidentally takes it as the truth.
– Jim Hunziker
Jul 22 '10 at 19:30
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