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catch exception that is thrown in different thread
...( Method1 ) spawns a new thread.
That thread execute a method ( Method2 ) and during exectution an exception is thrown.
I need to get that exception information on the calling method ( Method1 )
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COUNT DISTINCT with CONDITIONS
... only positive values. Zeros or negative values would be evaluated as null and won't be included in count.
One thing to note here is that this can be done by reading the table once. When it seems that you have to read the same table twice or more, it can actually be done by reading once, in most of...
Ignore mouse interaction on overlay image
I have a menu bar with hover effects, and now I want to place a transparent image with a circle and a "handdrawn" text over one of the menu items. If I use absolute positioning to place the overlay image above the menu item, the user will not be able to click the button and the hover effect will not...
What is the difference between Numpy's array() and asarray() functions?
What is the difference between Numpy's array() and asarray() functions? When should you use one rather than the other? They seem to generate identical output for all the inputs I can think of.
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How to find an available port?
...nt to start a server which listen to a port. I can specify port explicitly and it works. But I would like to find a port in an automatic way. In this respect I have two questions.
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Changing the “tick frequency” on x or y axis in matplotlib?
...np.arange was used rather than Python's range function just in case min(x) and max(x) are floats instead of ints.)
The plt.plot (or ax.plot) function will automatically set default x and y limits. If you wish to keep those limits, and just change the stepsize of the tick marks, then you could us...
Why does Pycharm's inspector complain about “d = {}”?
... a shame because it is useful for many things like PEP, ..., real problems and real performance hints.
– dashesy
Jan 14 '15 at 18:09
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What is the difference between .*? and .* regular expressions?
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It is the difference between greedy and non-greedy quantifiers.
Consider the input 101000000000100.
Using 1.*1, * is greedy - it will match all the way to the end, and then backtrack until it can match 1, leaving you with 1010000000001.
.*? is non-greedy. * w...
What is difference between Collection.stream().forEach() and Collection.forEach()?
I understand that with .stream() , I can use chain operations like .filter() or use parallel stream. But what is difference between them if I need to execute small operations (for example, printing the elements of the list)?
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fastest (low latency) method for Inter Process Communication between Java and C/C++
... passing a single byte with code like this:
MappedByteBuffer mem =
new RandomAccessFile("/tmp/mapped.txt", "rw").getChannel()
.map(FileChannel.MapMode.READ_WRITE, 0, 1);
while(true){
while(mem.get(0)!=5) Thread.sleep(0); // waiting for client request
mem.put(0, (byte)10); // sending the re...