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ExecutorService, how to wait for all tasks to finish

What is the simplest way to to wait for all tasks of ExecutorService to finish? My task is primarily computational, so I just want to run a large number of jobs - one on each core. Right now my setup looks like this: ...
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How bad is shadowing names defined in outer scopes?

I just switched to Pycharm and I am very happy about all the warnings and hints it provides me to improve my code. Except for this one which I don't understand: ...
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What is the proper declaration of main?

What is the proper signature of the main function in C++? What is the correct return type, and what does it mean to return a value from main ? What are the allowed parameter types, and what are their meanings? ...
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Why is Java's SimpleDateFormat not thread-safe? [duplicate]

Please tell with a code example why is SimpleDateFormat not threadsafe. What is the problem in this class? Is The problem with format function of SimpleDateFormat ? Please give a code which demonstrates this fault in class. ...
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How to create a MySQL hierarchical recursive query

I have a MySQL table which is as follows: 15 Answers 15 ...
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How do I get the application exit code from a Windows command line?

I am running a program and want to see what its return code is (since it returns different codes based on different errors). ...
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Number of elements in a javascript object

Is there a way to get (from somewhere) the number of elements in a javascript object?? (i.e. constant-time complexity). 6 A...
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How to get the index of an element in an IEnumerable?

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Git is ignoring files that aren't in gitignore

I have a git repository that is ignoring image files as well as a few other files, but my .gitignore file only has it ignoring a config.php file. Is there some global ignore file somewhere that I can't seem to find? I have to specify files to add them now, and it's giving me this warning: ...
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PEP 8, why no spaces around '=' in keyword argument or a default parameter value?

Why does PEP 8 recommend not having spaces around = in a keyword argument or a default parameter value ? 6 Answers ...