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What issues should be considered when overriding equals and hashCode in Java?

....age). isEquals(); } } Also remember: When using a hash-based Collection or Map such as HashSet, LinkedHashSet, HashMap, Hashtable, or WeakHashMap, make sure that the hashCode() of the key objects that you put into the collection never changes while the object is in the collection...
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Non-Relational Database Design [closed]

...ing about design strategies you have used with non-relational "nosql" databases - that is, the (mostly new) class of data stores that don't use traditional relational design or SQL (such as Hypertable, CouchDB, SimpleDB, Google App Engine datastore, Voldemort, Cassandra, SQL Data Services, etc.). ...
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How to remove convexity defects in a Sudoku square?

...processing function, so this should be possible in OpenCV, too. The spline-based image transformation might be harder, but I don't think you really need it. Probably using the perspective transformation you use now on each individual cell will give good enough results. ...
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What does 'wb' mean in this code, using Python?

... when you specify text mode with wt), however, Python will encode the text based on the default text encoding. Additionally, Python will convert line endings (\n) to whatever the platform-specific line ending is, which would corrupt a binary file like an exe or png file. Text mode should therefore ...
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How to get a time zone from a location using latitude and longitude coordinates?

...nt libraries for just about everything Self-hosted web services geo2tz - based on Timezone lookup, available via Docker image Other Ideas Find the nearest city with an R-Tree Find the nearest city with MySQL Please update this list if you know of any others Also, note that the nearest-city appr...
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How to Test a Concern in Rails

...dity of objects or invoke ActiveRecord callbacks unless you set up the database accordingly (because your dummy class won't have a database table backing it). Moreover, you'll want to not only test the concern but also test the concern's behavior inside your model specs. So why not kill two birds w...
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Find the number of downloads for a particular app in apple appstore [closed]

...t you can do is find a few companies that are sharing and then extrapolate based on app ranking (which is available publicly). The best you'll get is a ball park estimate. share | improve this answe...
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What is difference between sjlj vs dwarf vs seh?

...stack unwinding tables have to be included in th executables. A method based on setjmp/longjmp (SJLJ). SJLJ-based EH is much slower than DW2 EH (penalising even normal execution when no exceptions are thrown), but can work across code that has not been compiled with GCC or that does not have...
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Matplotlib - global legend and title aside subplots

...uptitle("Title centered above all subplots", fontsize=14) Alternatively (based on @Steven C. Howell's comment below (thank you!)), use the matplotlib.pyplot.suptitle() function: import matplotlib.pyplot as plt # plot stuff # ... plt.suptitle("Title centered above all subplots", fontsize=14) ...
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Configure Microsoft.AspNet.Identity to allow email address as username

...of this (in App_Code\IdentityModels.cs) is public UserManager() : base(new UserStore<ApplicationUser>(new ApplicationDbContext())) { UserValidator = new UserValidator<ApplicationUser>(this) { AllowOnlyAlphanumericUserNames = false }; } ...