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使用模拟器构建应用程序 · App Inventor 2 中文网
...tart the emulator program. When you click Connect to Phone in the Blocks Editor, your app will appear in the emulator.
You can’t do everything with the emulator that you can with a real phone — you can’t shake it, for example, and the emulator can’t make or recieve phone calls — but you c...
In log4j, does checking isDebugEnabled before logging improve performance?
...there to prevent potentially expensive computation of the log message when it involves invocation of the toString() methods of various objects and concatenating the results.
In the given example, the log message is a constant string, so letting the logger discard it is just as efficient as checking...
Rolling or sliding window iterator?
I need a rolling window (aka sliding window) iterable over a sequence/iterator/generator. Default Python iteration can be considered a special case, where the window length is 1. I'm currently using the following code. Does anyone have a more Pythonic, less verbose, or more efficient method for d...
How to read a large file - line by line?
I want to iterate over each line of an entire file. One way to do this is by reading the entire file, saving it to a list, then going over the line of interest. This method uses a lot of memory, so I am looking for an alternative.
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Determining if a variable is within range?
I need to write a loop that does something like:
9 Answers
9
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AtomicInteger lazySet vs. set
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Cited straight from "JDK-6275329: Add lazySet methods to atomic classes":
As probably the last little JSR166 follow-up for Mustang,
we added a "lazySet" method to the Atomic classes
(AtomicInteger, AtomicReference, etc...
overlay two images in android to set an imageview
... to overlay two images in my app, but they seem to crash at my canvas.setBitmap() line. What am I doing wrong?
5 Answers
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Is “inline” without “static” or “extern” ever useful in C99?
...e.
[update, to elaborate]
I do not think there is any use for "inline" (without "static" or "extern") in a .c file. But in a header file it makes sense, and it requires a corresponding "extern inline" declaration in some .c file to actually generate the stand-alone code.
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How to prevent ifelse() from turning Date objects into numeric objects
...follow
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edited Jun 20 at 9:12
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answered Jun 29 '16 at 7:31
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How to completely uninstall Visual Studio 2010?
...emove Visual Studio 2010 from my computer. When you install Visual Studio, it also installs a bunch of programs (about 55) in the add/remove programs panel ( appwiz.cpl ).
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