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Why are static variables considered evil?
...etter question really might have been when to use static variables/methods vs singletons...
– studgeek
Aug 17 '11 at 19:57
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What is the difference between a weak reference and an unowned reference?
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What's the difference between weak var Person? vs. var Person? ?
– Dean
Nov 30 '14 at 4:32
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What is the difference between self::$bar and static::$bar in PHP?
...g a late-bound constructor can be found in this related question: New self vs. new static
However, that doesn't preclude using static with properties as well.
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What is the global interpreter lock (GIL) in CPython?
...he GIL exists in the first place: Why the Global Interpreter Lock?
Process vs thread experiments
What is JSONP, and why was it created?
...ntrol of the request.
These days (2015), CORS is the recommended approach vs. JSONRequest. JSONP is still useful for older browser support, but given the security implications, unless you have no choice CORS is the better choice.
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Spinlock versus Semaphore
...xpands to a void statement.
Also, when we are trying to compare Semaphore vs Spin-lock, I believe semaphore refers to the one used in kernel - NOT the one used for IPC (userland).
Basically, spin-lock shall be used if critical section is small (smaller than the overhead of sleep/wake-up) and crit...
What causes and what are the differences between NoClassDefFoundError and ClassNotFoundException?
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From http://www.javaroots.com/2013/02/classnotfoundexception-vs.html:
ClassNotFoundException : occurs when class loader could not find the required class in class path. So, basically you should check your class path and add the class in the classpath.
NoClassDefFoundError : this is m...
Which is more efficient, a for-each loop, or an iterator?
... more power over explicitly using a type of iterator (e.g. List.iterator() vs. List.listIterator(), although in most cases they return the same implementation). You also have the ability to reference the Iterator in your loop. This allows you to do things like remove items from your collection wit...
Possible heap pollution via varargs parameter
...ntains references whose types are not what we might expect? (List<A> vs List<B> in your example)
– hertzsprung
Sep 17 '12 at 16:03
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Use 'import module' or 'from module import'?
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Even though many people already explained about import vs import from, I want to try to explain a bit more about what happens under the hood, and where all the places it changes are.
import foo:
Imports foo, and creates a reference to that module in the current namespace. The...