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Java Singleton and Synchronization
...e loaded when it is needed. That means that the first time getInstance is called, InstanceHolder will be loaded and instance will be created, and since this is controlled by ClassLoaders, no additional synchronization is necessary.
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Is there a quicker / better way to clear the iPhone Simulator cache than deleting its directory?
...a, or the contents of the iPhone Simulator directory, to get things to actually execute from my code. Clean in Xcode doesn't do the same as emptying those directories, right? And if not, is there an easier way to do it than lugging Finder around to get to them, and clearing them?
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Get screen width and height in Android
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@EpicPandaForce actually I was thinking of Android Oreo which allows launching an activity on another display, see the following: developer.android.com/reference/android/app/…
– satur9nine
Jul 10 '18 at 2...
Is there a way to measure how sorted a list is?
...er according to some ordering < on the set of T's.
From Wikipedia:
Formally, let A(1), A(2), ..., A(n) be a sequence of n numbers.If i < j and A(i) > A(j), then the pair (i,j) is called an inversion of A.
The inversion number of a sequence is one common measure of its sortedness.Formally, ...
Visual List of iOS Fonts?
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Have you tried iOS Fonts?
This gives you a visual of all of the available fonts with the ability to enter your own string of text to see how it would look.
This doesn't appear to have been updated for iOS 7 however but I am unaware of any additional fonts which have been added...
.toArray(new MyClass[0]) or .toArray(new MyClass[myList.size()])?
... the result may be different.
Benchmark results (score in microseconds, smaller = better):
Benchmark (n) Mode Samples Score Error Units
c.a.p.SO29378922.preSize 1 avgt 30 0.025 ▒ 0.001 us/op
c.a.p.SO29378922.preSize 100 avgt 30 0.15...
Declaring variables inside loops, good practice or bad practice?
...their scope is restricted to inside the loop. It cannot be referenced nor called outside of the loop.
This way:
If the name of the variable is a bit "generic" (like "i"), there is no risk to mix it with another variable of same name somewhere later in your code (can also be mitigated using the -W...
How do I install a plugin for vim?
... that it's completely safe (symlinks don't overwrite existing files, uninstall only deletes symlinks) and easy to keep things updated.
# Easily install vim plugins from a source control checkout (e.g. Github)
#
# alias vim-install=rake -f ~/.vim/rakefile-vim-install
# vim-install
# vim-install unin...
Named capturing groups in JavaScript regex?
...e just "syntactic sugar". It helps to use capturing groups only when you really need them and to use non-capturing groups (?:...) in all other circumstances.
The bigger problem (in my opinion) with JavaScript is that it does not support verbose regexes which would make the creation of readable, com...
getActivity() returns null in Fragment function
...od to your Fragment and putting a break point on it and seeing when it is called relative to your call to asd(). You'll see that it is called after the method where you make the call to asd() exits. The onAttach call is where the Fragment is attached to its activity and from this point getActivity()...