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Why do we use Base64?
...omputing.
Computers communicate in binary - 0s and 1s - but people typically want to communicate with more rich forms data such as text or images. In order to transfer this data between computers it first has to be encoded into 0s and 1s, sent, then decoded again. To take text as an example - the...
What's the difference between encoding and charset?
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Basically:
charset is the set of characters you can use
encoding is the way these characters are stored into memory
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How to flip background image using CSS?
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You can flip it horizontally with CSS...
a:visited {
-moz-transform: scaleX(-1);
-o-transform: scaleX(-1);
-webkit-transform: scaleX(-1);
transform: scaleX(-1);
filter: FlipH;
-ms-filter: "FlipH";
}
jsFiddle.
If you want ...
rsync exclude according to .gitignore & .hgignore & svn:ignore like --filter=:C
...ps://git-scm.com/docs/git-ls-files
Options:
--exclude-standard Consider all .gitignore files.
-o Don't ignore unstaged changes.
-i Only output ignored files.
--directory Only output the directory path if the entire directory is ignored.
The only thing I left to ignore was .git.
rsync -azP --ex...
How to generate Class Diagram (UML) on Android Studio (IntelliJ Idea)
... a free plugin that can generate class diagrams with android studio.
It's called SimpleUML.
Update Android Studio 2.2+:
To install the plugin, follow steps in this answer: https://stackoverflow.com/a/36823007/1245894
Older version of Android Studio
On Mac: go to Android Studio -> Preferences -&...
Python - write() versus writelines() and concatenated strings
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More specifically, writelines expects an iterable. You can use a list, a tuple, or a generator.
– Mark Ransom
Sep 11 '12 at 20:52
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Building a notification system [closed]
...══════╝
(Add time fields where you see fit)
This is basically for grouping changes per object, so that you could say "You have 3 friend requests". And grouping per actor is useful, so that you could say "User James Bond made changes in your bed". This also gives ability to translate...
What's the difference between an exclusive lock and a shared lock?
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When the students are reading (shared locks) what is on the board:
They all can read what is on it, together => Multiple shared locks can co-exist.
The teacher waits for them to finish reading before she clears the board to write more => If one or more shared locks already exist, exclusive ...
Which annotation should I use: @IdClass or @EmbeddedId
... a clear notion of the fields that make the composite key because they are all aggregated in a class that is accessed trough a field access operator.
Another difference with @IdClass and @EmbeddedId is when it comes to write HQL :
With @IdClass you write:
select e.name from Employee e
and with @...
What is the point of “final class” in Java?
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First of all, I recommend this article: Java: When to create a final class
If they do, when do they use it so I can understand it better and know when to use it.
A final class is simply a class that can't be extended.
(It doe...