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Convert ArrayList to String[] array [duplicate]
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FYI, IntelliJ IDEA suggests to change it as list.toArray(new String[0]). I don't know why.
– Jin Kwon
Sep 7 '18 at 5:42
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SQL JOIN and different types of JOINs
... @KNU The w3fools should give credit from where they have taken the idea for the pictures. See A visualization of SQL joins by Jeff Atwood (yes, the one who co-authored SO) and the linked article by Ligaya Turmelle where Jeff got the idea and explanded it.
– ypercubeᵀ...
Can a foreign key be NULL and/or duplicate?
...ow nulls on the field that has the FK. The null value is separate from the idea of it being an FK.
Whether it is unique or not unique relates to whether the table has a one-one or a one-many relationship to the parent table. Now if you have a one-one relationship, it is possible that you could ha...
Release generating .pdb files, why?
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Customers frequently report edge cases and bugs that only crop up under "ideal" conditions. These are things that are almost impossible to reproduce in the lab because they rely on some whacky configuration of that user's machine. If they're particularly helpful customers, they'll report the excep...
Creating a blurring overlay view
... Synchronous UIView Snapshot Convolving. Great code and a great read. Some ideas from this post:
Use a serial queue to throttle updates from CADisplayLink.
Reuse bitmap contexts unless bounds change.
Draw smaller images using -[CALayer renderInContext:] with a 0.5f scale factor.
Other stuff
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What is the best way to implement constants in Java? [closed]
...highly advise against having a single constants class. It may seem a good idea at the time, but when developers refuse to document constants and the class grows to encompass upwards of 500 constants which are all not related to each other at all (being related to entirely different aspects of the a...
What are the advantages of using a schema-free database like MongoDB compared to a relational databa
...lity.
You'll need to read more about it and play with it to get a better idea. Here's an online demo:
http://try.mongodb.org/
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Adding two Java 8 streams, or an extra element to a stream
...lightly orthogonal question to this thread but why do you claim It's a bad idea to import static methods with names? I am genuinely interested - I find it makes the code more concise and readable and a lot of people I had asked thought the same. Care to provide some examples why that is generally ba...
Determine if Android app is being used for the first time
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Another idea is to use a setting in the Shared Preferences. Same general idea as checking for an empty file, but then you don't have an empty file floating around, not being used to store anything
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Namespace + functions versus static methods on a class
... threads having privilegied access to the private data of a class is a bad idea. I would hide one thread inside a class, and make sure to isolate the data for that thread from the data for the main thread. Of course, data that is supposed to be shared then can be members of that class, but they stil...