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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...
Unit Testing bash scripts
... of side effects and utilize system resources such as filesystem, network, etc. Ideally, unit tests are side-effect free and do not depend on system resources.
– jayhendren
Nov 3 '14 at 17:21
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Replace whitespaces with tabs in linux
...an up the output of say, unzip -l , for further processing with grep, cut, etc.
e.g.,
unzip -l some-jars-and-textfiles.zip | tr [:blank:] \\t | cut -f 5 | grep jar
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My Understanding of HTTP Polling, Long Polling, HTTP Streaming and WebSockets
... achieve secure cross-origin capable connections using Flash, Silverlight, etc -- but most implementations won't do that because it's not easy.
For example, if you rely on WebSocket for a cross-origin connection, that will work fine. But if you then run in an old browser or a firewall/proxy interfe...
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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Load image from url
...eres so many out there. My favorite one is Universal Image loader, Picasso etc.
– AmeyaB
Mar 28 '16 at 5:17
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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 a javascript if statement with multiple conditions test all of them?
... won't throw a compile error if response.authResponse is null or undefined etc because the first condition failed.
Other languages had this problem in the early days and I think it's a standard approach in building compilers now.
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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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How to pass password to scp?
...sswdfile` scp [...]. This way, the password won't show up in ps` listings, etc. and you can protect the password with file permissions.
– Christopher Schultz
Mar 20 '15 at 15:30
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