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Algorithm to generate all possible permutations of a list?
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Basically, for each item from left to right, all the permutations of the remaining items are generated (and each one is added with the current elements). This can be done recursively (or iteratively if you like pain) until the la...
Android multiple email attachments using Intent
...However, when I tried to have multiple images attached to the same mail by calling Intent.putExtra(android.content.Intent.EXTRA_STREAM, uri) multiple times, it failed to work. None of the attachment show up in the email.
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Multiple returns from a function
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Technically, you can't return more than one value. However, there are multiple ways to work around that limitation. The way that acts most like returning multiple values, is with the list keyword:
function getXYZ()
{
return ar...
Dynamically Changing log4j log level
What are the different approaches for changing the log4j log level dynamically, so that I will not have to redeploy the application. Will the changes be permanent in those cases?
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What is the difference between Hibernate and Spring Data JPA
...JPA data access abstraction. Spring Data JPA cannot work without a JPA provider.
Spring Data offers a solution to the DDD Repository pattern or the legacy GenericDao custom implementations. It can also generate JPA queries on your behalf through method name conventions.
With Spring Data, you may u...
Is there a /dev/null on Windows?
... file.
(I believe the same is true if you try to create a file programmatically, but I haven't tried it.)
In PowerShell, you want $null:
echo 1 > $null
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Rails I18n validation deprecation warning
...nfiguration to the target classes. If you use a gem (or Rails plugin) that calls any of the I18n methods before the config is assigned to I18n, then you'll get the warning.
In this case, you need to skip the Rails stack and set the config immediately to the I18n gem by calling
I18n.config.enforce_...
How create table only using tag and Css
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.div-table {
display: table;
width: auto;
background-color: #eee;
border: 1px solid #666666;
border-spacing: 5px; /* cellspacing:poor IE support for this */
}
.div-table-row {
display: table-row;
width: auto;
clear:...
Is there a Mutex in Java?
...} catch(InterruptedException ie) {
// ...
}
In this usage, you're only calling release() after a successful acquire()
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How can I get the client's IP address in ASP.NET MVC?
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how do i call this from the controller side?
– melaos
Apr 5 '10 at 8:49
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