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Why use a ReentrantLock if one can use synchronized(this)?
I'm trying to understand what makes the lock in concurrency so important if one can use synchronized (this) . In the dummy code below, I can do either:
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How to detect when WIFI Connection has been established in Android?
...that a valid network connection for HTTP exists. What should I listen for and what additional tests do I need to make to know that a valid connection exists.
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How can I get the source code of a Python function?
... tuple; tuple[0] is list of strings representing the lines of source code, and tuple[1] is the line number in the context of execution where it was run. In IPython; this is the line number within the cell not the overall notebook
– The Red Pea
Sep 23 '14 at 5:3...
DialogFragment setCancelable property not working
I am working in an android application and am using a DialogFragment to show a dialog and I want to make that DialogFragment not cancelable. I have made the dialog cancelable property to false, but still its not affecting.
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What is sys.maxint in Python 3?
I've been trying to find out how to represent a maximum integer, and I've read to use "sys.maxint" . However, in Python 3 when I call it I get:
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Override Python's 'in' operator?
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Zoran, I agree, and I even upvoted this answer and not the other. I'm just pointing out that a truly good answer should always link to docs, if available.
– Peter Hansen
Aug 31 '12 at 21:55
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Installing older version of R package
I am trying to use Rpy2 and ggplot2 but I get an error. After some searching for the error online, I found that the error occurs because there are changes in the ggplot2 package that are not yet reflected in Rpy2 (for example, see this post (Edit: Link is now dead)).
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WebDriver: check if an element exists? [duplicate]
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and the size is not a method - driver.findElements( By.id("...") ).size != 0
– Gal Bracha
Feb 1 '15 at 12:26
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How to gzip all files in all sub-directories into one compressed file in bash
...le to specify the output filename for the compressed file (e.g., files.gz) and overwrite the old compressed file file if one already exists.
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How to set a Timer in Java?
...how to do what the subject asks as this was how I initially interpreted it and a few people seemed to find helpful. The question was since clarified and I've extended the answer to address that.
Setting a timer
First you need to create a Timer (I'm using the java.util version here):
import java....