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How can I determine whether a Java class is abstract by reflection
...a Jar file and wish to find those which are not abstract. I can solve this by instantiating the classes and trapping InstantiationException but that has a performance hit as some classes have heavy startup. I can't find anything obviously like isAbstract() in the Class.java docs.
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What is the difference between print and puts?
...a newline after each argument. That's a key point and not clear from the Ruby docs (since the example has only 1 argument).
– cdunn2001
Jul 29 '12 at 23:49
3
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How do I make $.serialize() take into account those disabled :input elements?
It seems by default disabled input elements are ignored by $.serialize() . Is there a workaround?
9 Answers
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How to pull a random record using Django's ORM?
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Using order_by('?') will kill the db server on the second day in production. A better way is something like what is described in Getting a random row from a relational database.
from django.db.models.aggregates import Count
from random ...
Order discrete x scale by frequency/value
...ed in alphabetical order, but I need to rearrange it so that it is ordered by the value of the y-axis (i.e., the tallest bar will be positioned on the left).
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指定组件的大小 · App Inventor 2 中文网
...s height and width. There are four choices:
Automatic: Size is chosen by the system
Fill parent: Size is chosen to fill the space available.
Size specified in pixels
Size in percent of Screen (not available for all components)
Since not all Android devices have the same screen size, it...
Difference between sh and bash
...sh
sh (or the Shell Command Language) is a programming language described by the POSIX
standard.
It has many implementations (ksh88, dash, ...). bash can also be
considered an implementation of sh (see below).
Because sh is a specification, not an implementation, /bin/sh is a symlink
(or a hard li...
jQuery find element by data attribute value
...ndants of each element
in the current set of matched elements, filtered by a selector, jQuery object, or element.
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How to run Node.js as a background process and never die?
...t of those backgrounded processes. And you can kill a backgrounded process by running kill %1 or kill %2 with the number being the index of the process.
Powerful solution (allows you to reconnect to the process if it is interactive):
screen
You can then detach by pressing Ctrl+a+d and then atta...
Submitting a form by pressing enter without a submit button
Well I am trying to submit a form by pressing enter but not displaying a submit button. I don't want to get into JavaScript if possible since I want everything to work on all browsers (the only JS way I know is with events).
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