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Why are arrays covariant but generics are invariant?

From Effective Java by Joshua Bloch, 9 Answers 9 ...
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Should __init__() call the parent class's __init__()?

... In Python, calling the super-class' __init__ is optional. If you call it, it is then also optional whether to use the super identifier, or whether to explicitly name the super class: object.__init__(self) In case of object, calling the super method is not st...
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Get free disk space

...eEx from link by RichardOD. // Pinvoke for API function [DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Auto)] [return: MarshalAs(UnmanagedType.Bool)] public static extern bool GetDiskFreeSpaceEx(string lpDirectoryName, out ulong lpFreeBytesAvailable, out ulong lpTotalNumberOfByte...
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How to implement has_many :through relationships with Mongoid and mongodb?

... | edited May 4 '15 at 17:32 answered May 1 '13 at 1:09 Ste...
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What’s the best way to reload / refresh an iframe?

... ==a – Bobby Stenly Mar 19 '13 at 6:32 6 frames[1].location.href.reload() and window.frames['some...
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Redirect stdout to a file in Python?

... @mgold or you can use sys.stdout = sys.__stdout__ to get it back. – clemtoy Jul 9 '15 at 12:52  |  show 9 ...
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How to properly create composite primary keys - MYSQL

...r tables. – wmorse Apr 29 '11 at 21:32 thank you. I think what your saying makes much sense and I will try it as a two...
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What is the best way to deal with the NSDateFormatter locale “feechur”?

...tedly. – Hot Licks Mar 10 '15 at 11:32 I don't know why changing timeZone value of the formatter would get in the way ...
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Difference between Apache CXF and Axis

...ian SchneiderChristian Schneider 18.1k22 gold badges3232 silver badges5555 bronze badges add a comment ...
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Programmatically Request Access to Contacts

... // First time access has been granted, add the contact [self _addContactToAddressBook]; } else { // User denied access // Display an alert telling user the contact could not be added } }); } else if (ABAddressBookGetAuthorizationStatus() == kABAu...