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How to send a stacktrace to log4j?
... The logger takes an object for its first argument and will toString() it. However the second argument has to be a Throwable and displays the stack trace.
– Peter Lawrey
Dec 3 '10 at 16:50
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How to see full symlink path
...e following if you have python 2.6 (or later) installed
python -c 'import os.path; print(os.path.realpath("symlinkName"))'
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How to upgrade PostgreSQL from version 9.6 to version 10.1 without losing data?
I'm using the PostgreSQL database for my Ruby on Rails application (on Mac OS X 10.9).
15 Answers
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地图组件（高德地图） · App Inventor 2 中文网
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地图（基础容器，默认“高德地图”）
一个二维容器，用于在背景中渲染地图图块，并允许使用多个 标记 元素来标识地图上的点。
原版是OpenStreet开源地图，国内无法访问，中文网已深度定制，默认接入国内...
Android, getting resource ID from string?
...con", R.drawable.class); // or other resource class
I just found a blog post saying that Resources.getIdentifier() is slower than using reflection like I did. Check it out.
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How can I randomize the lines in a file using standard tools on Red Hat Linux?
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I'm usually a Perl fan, but came across this ruby example which has the benefit of being shorter: ruby -e 'puts STDIN.readlines.shuffle'. It would need testing on big inputs to see if the speed is comparable. (also works on OS X)
– mivk
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How can I convert a stack trace to a string?
... trace to String. This class is available in Apache commons-lang which is most common dependent library with many popular open sources
org.apache.commons.lang.exception.ExceptionUtils.getStackTrace(Throwable)
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Take a char input from the Scanner
...al keyboard strokes, this is not going to work. You would need to do some OS-specific native code stuff to turn off or work around line-buffering for console at the OS level.
Reference:
How to read a single char from the console in Java (as the user types it)?
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In Python, how do I create a string of n characters in one line of code?
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This might be a little off the question, but for those interested in the randomness of the generated string, my answer would be:
import os
import string
def _pwd_gen(size=16):
chars = string.letters
chars_len = len(chars)
return str().join(chars[int(ord(c) / 256...
How to include external Python code to use in other files?
If you have a collection of methods in a file, is there a way to include those files in another file, but call them without any prefix (i.e. file prefix)?
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