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Polymorphism vs Overriding vs Overloading
...xample when teaching a class. The canonical "Bank Account" class didn't really express the "abstractness" of the base class. The other canonical example (Animal, make noise) was too abstract for understanding. I was looking for a single base with too obvious subclasses. Actually, goPee() was the...
How to prevent multiple instances of an Activity when it is launched with different Intents
...unched using the "Open" button on the Google Play Store app (previously called Android Market). It seems that launching it from the Play Store uses a different Intent than launching it from the phone's application menu of icons. This is leading to multiple copies of the same Activity being launc...
Center a position:fixed element
...in: 5% auto; for this. Without position: fixed; it centers fine horizontally, but not vertically. After adding position: fixed; , it's even not centering horizontally.
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How to get all enum values in Java?
... yourEnums = YourEnumClass.class.getEnumConstants(); solved my problem of calling from a non-static method.
– Jeremy
Jul 21 '17 at 23:33
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Is background-color:none valid CSS?
...nswered Jan 5 '12 at 8:42
James AllardiceJames Allardice
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Scrolling child div scrolls the window, how do I stop that?
...etting the overflow to hidden hides the scrollbar which suddenly reformats all the contents of the outer element. also, this assumes the outer element is body but it could be another scrolling div.
– robisrob
Dec 17 '15 at 16:25
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How to redirect output of an entire shell script within the script itself?
Is it possible to redirect all of the output of a Bourne shell script to somewhere, but with shell commands inside the script itself?
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Get current time in seconds since the Epoch on Linux, Bash
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So far, all the answers use the external program date.
Since Bash 4.2, printf has a new modifier %(dateformat)T that, when used with argument -1 outputs the current date with format given by dateformat, handled by strftime(3) (man 3...
How to get CSS to select ID that begins with a string (not in Javascript)?
... "starts with". Conversely, $= indicates "ends with".
The symbols are actually borrowed from Regex syntax, where ^ and $ mean "start of string" and "end of string" respectively.
See the specs for full information.
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How to namespace Twitter Bootstrap so styles don't conflict
...ap, but only on specific elements, so I need to figure out a way to prefix all Twitter Bootstrap classes with my prefix, or use the less mixins. I'm not experienced with this yet so I don't quite understand how to do this. Here's an example of the HTML that I'm trying to style:
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