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How to synchronize a static variable among threads running different instances of a class in Java?
...eyword before a method brings synchronization to that object. That is, 2 threads running the same instance of the object will be synchronized.
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Limit file format when using ?
...input type="file"
accept="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet,application/vnd.ms-excel" />
[Edge (EdgeHTML) behavior: The file type filter dropdown shows the file types mentioned here, but is not the default in the dropdown. The default filter is All files (*...
Android 4.3 Bluetooth Low Energy unstable
...on't forget to call android.bluetooth.BluetoothGatt#close()
Start a new thread inside onLeScan(..) and then connect. Reason: BluetoothDevice#connectGatt(Context context, boolean autoConnect, BluetoothGattCallback callback) always fails, if called inside LeScanCallback() {...}.onLeScan(BluetoothDevi...
When and why I should use session_regenerate_id()?
...ion in php?
Should I always use it after I use the session_start() ?
I've read that I have to use it to prevent session fixation, is this the only reason?
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Are there any SHA-256 javascript implementations that are generally considered trustworthy?
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I agree with @NickBrunt . It is better if the attacker reads a random hash string that may fit only with this particular app rather than the original password that may be used in several places.
– Aebsubis
May 28 '14 at 15:16
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How does data binding work in AngularJS?
...has an inconsistent view of the world. This is a very similar problem to thread locking, which JavaScript avoids since each callback executes exclusively and to completion. Change events break this since setters can have far-reaching consequences which are not intended and non obvious, which creates...
how to remove the dotted line around the clicked a element in html
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Like @Lo Juego said, read the article
a, a:active, a:focus {
outline: none;
}
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How to prune local tracking branches that do not exist on remote anymore
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If you want to delete all local branches that are already merged into master, you can use the following command:
git branch --merged master | grep -v '^[ *]*master$' | xargs git branch -d
More info.
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Is non-blocking I/O really faster than multi-threaded blocking I/O? How?
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The biggest advantage of nonblocking or asynchronous I/O is that your thread can continue its work in parallel. Of course you can achieve this also using an additional thread. As you stated for best overall (system) performance I guess it would be better to use asynchronous I/O and not multiple t...
Removing leading zeroes from a field in a SQL statement
I am working on a SQL query that reads from a SQLServer database to produce an extract file. One of the requirements to remove the leading zeroes from a particular field, which is a simple VARCHAR(10) field. So, for example, if the field contains '00001A', the SELECT statement needs to return the...