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Is there a way to instantiate a class by name in Java?
...lass.forName("com.foo.MyClass");
Constructor<?> constructor = clazz.getConstructor(String.class, Integer.class);
Object instance = constructor.newInstance("stringparam", 42);
Both methods are known as reflection. You will typically have to catch the various exceptions which can occur, includ...
CSS Background Opacity [duplicate]
...e directly. Editing your background image to be a semi-transparent png/gif/etc.. is even more correct. Opacity takes a bit more juice to render.
– Patrick Borkowicz
Dec 5 '14 at 19:11
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How do you create different variable names while in a loop? [duplicate]
... few situations when you do need to make a bunch of variables, x1, x2, x3, etc. But in most situations, using a dictionary really is the most appropriate thing to do.
– DevilApple227
Jul 2 '16 at 21:54
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How to find out what character key is pressed?
...ydown', function(event) {
const key = event.key; // "a", "1", "Shift", etc.
});
If you want to make sure only single characters are entered, check key.length === 1, or that it is one of the characters you expect.
Mozilla Docs
Supported Browsers
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Get the first element of an array
...$array));
In O(1):
array_pop(array_reverse($array));
Other use cases, etc...
If modifying (in the sense of resetting array pointers) of $array is not a problem, you might use:
reset($array);
This should be theoretically more efficient, if a array "copy" is needed:
array_shift(array_slice($...
Does Python support short-circuiting?
... it's not just 0, it's 0.0, 0j, decimal.Decimal(0), fractions.Fraction(0), etc.), as are all collections with length 0 (so on top of what you listed, b'' [Py3], u'' [Py2] and set()/frozenset() are all built-ins that evaluate as falsy), but user-defined/third-party types can define their own (with __...
How to add a right button to a UINavigationController?
...he navigation controller picks up its display information (title, buttons, etc) from the UIViewController that it is about to display. You don't actually add buttons and such directly to the UINavigationController.
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Get names of all keys in the collection
...s exactly what the question asks, and can be configured with limits, depth etc. Recommended by any who follows.
– Paul Biggar
Jun 10 '12 at 20:35
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Play a Sound with Python [duplicate]
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This seems ridiculous and far fetched but you could always use Windows (or whatever OS you prefer) to manage the sound for you!
import os
os.system("start C:/thepathyouwant/file")
Simple, no extensions, somewhat slow and junky, but working.
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CFBundleVersion in the Info.plist Upload Error
... changing build number solved the problem. set versions to 1.0.2 ... 2.0.2 etc. then increase build # (Adam 3 point give me an idia where to look).
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