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Difference between String replace() and replaceAll()
... than replaceAll() because the latter first compiles the regex pattern and then matches before finally replacing whereas the former simply matches for the provided argument and replaces.
Since we know the regex pattern matching is a bit more complex and consequently slower, then preferring replace(...
What would cause an algorithm to have O(log log n) complexity?
... buckets each holding a range of roughly √N integers. These buckets are then each internally subdivided into √(√ N) buckets, each of which holds roughly √(√ N) elements. To traverse the tree, you start at the root, determine which bucket you belong to, then recursively continue in the ap...
Random Gaussian Variables
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@Johann, if you're looking for pure speed, then the Zigorat Algorithm is generally recognised as the fastest approach. Furthermore the above approach can be made faster by carrying a value from one call to the next.
– Drew Noakes
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How to Disable landscape mode in Android?
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I was using this method, I was calling it in OnCreate then I would read data from some asset files. If I would start the app with device in landscape orientation it would rotate but this would result in erroneously reading those initialization assets, for some weird reason (mayb...
What is thread contention?
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For example, consider a thread that acquires a lock, modifies an object, then releases the lock and does some other things. If two threads are doing this, even if they never fight for the lock, the threads may run much slower than they would if only one thread was running.
Why? Say each thread is...
java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare();
...; to create one, call prepare() in the thread that is to run the loop, and then loop() to have it process messages until the loop is stopped.
class LooperThread extends Thread {
public Handler mHandler;
public void run() {
Looper.prepare();
mHandler = new Handler() {
...
Possibility of duplicate Mongo ObjectId's being generated in two different collections?
...ponse to your initial question: YES, if you use BSON Object ID generation, then for most drivers the IDs are almost certainly going to be unique across collections. See below for what "almost certainly" means.
Long Answer
The BSON Object ID's generated by Mongo DB drivers are highly likely to be u...
How can I use jQuery in Greasemonkey?
...gleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js
If you don't have 0.8, then use the technique Joan Piedra describes for manually adding a script element to the page.
Between version 0.8 and 0.9, @require is only processed when the script is first installed. If you change the list of required sc...
How to run multiple .BAT files within a .BAT file
...cient DOS versions it was not possible to recursively execute batch files. Then the call command was introduced that called another cmd shell to execute the batch file and returned execution back to the calling cmd shell when finished.
Obviously in later versions no other cmd shell was necessary an...
Shared-memory objects in multiprocessing
...ng system that uses copy-on-write fork() semantics (like any common unix), then as long as you never alter your data structure it will be available to all child processes without taking up additional memory. You will not have to do anything special (except make absolutely sure you don't alter the o...