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What is the difference between Serializable and Externalizable in Java?
...em. To handle this situation, the java.io.Externalizable interface was provided, which is like java.io.Serializable but with custom-written mechanisms to perform the marshalling and unmarshalling functions (you need to implement readExternal and writeExternal methods on your class). This gives you t...
How to check if running as root in a bash script
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The $EUID environment variable holds the current user's UID. Root's UID is 0. Use something like this in your script:
if [ "$EUID" -ne 0 ]
then echo "Please run as root"
exit
fi
Note: If you get 2: [: Illegal number: check if...
HTML5 best practices; section/header/aside/article elements
...elements, always ask yourself: “Is all of the content related?”
aside – Used for tangentially related content. Just because some content appears to the left or right of the main content isn’t enough reason to use the aside element. Ask yourself if the content within the aside can be rem...
How to turn a String into a JavaScript function call? [duplicate]
...settings.functionName];
if(typeof fn === 'function') {
fn(t.parentNode.id);
}
Edit: In reply to @Mahan's comment:
In this particular case, settings.functionName would be "clickedOnItem". This would, at runtime translate var fn = window[settings.functionName]; into var fn = window["clickedOnIte...
MySQL Data - Best way to implement paging?
...I agree that he should have mentioned that he was copying the docs and provided a link to the original source. Also I'm surprised that the documentation would include examples of using LIMIT without an ORDER BY... that seems like a bad practice to be encouraging. Without an ORDER BY there's no guara...
How do I find duplicates across multiple columns?
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Duplicated id for pairs name and city:
select s.id, t.*
from [stuff] s
join (
select name, city, count(*) as qty
from [stuff]
group by name, city
having count(*) > 1
) t on s.name = t.name and s.city = t.city
...
MySQL Creating tables with Foreign Keys giving errno: 150
...ined by mistake. See @andrewdotn's answer below for instructions on how to identify these problem FK's.
Hope this helps.
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CSS: fixed position on x-axis but not y?
...y? So when a user scrolls up, the div tag will scroll up with it, but not side to side?
17 Answers
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What's Mongoose error Cast to ObjectId failed for value XXX at path “_id”?
...g a request to /customers/41224d776a326fb40f000001 and a document with _id 41224d776a326fb40f000001 does not exist, doc is null and I'm returning a 404 :
...
How to analyze a java thread dump?
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The TID is thead id and NID is: Native thread ID. This ID is highly platform dependent. It's the NID in jstack thread dumps. On Windows, it's simply the OS-level thread ID within a process. On Linux and Solaris, it's the PID of ...