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What's “P=NP?”, and why is it such a famous question? [closed]
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P stands for polynomial time. NP stands for non-deterministic polynomial time.
Definitions:
Polynomial time means that the complexity of the algorithm is O(n^k), where n is the size of your data (e. g. number of elements in a lis...
Javadoc @see or {@link}?
...nion, {@link} is best used when you literally use a class, field, constructor or method name in your description. The user will be able to click through to the javadoc of what you've linked.
I use the @see annotation in 2 cases:
Something is very relevant but not mentioned in the description.
I r...
Should I test private methods or only public ones? [closed]
...e methods breaks encapsulation.
If I find that the private method is huge or complex or important enough to require its own tests, I just put it in another class and make it public there (Method Object). Then I can easily test the previously-private-but-now-public method that now lives on its own c...
Meaning of “[: too many arguments” error from if [] (square brackets)
I couldn't find any one simple straightforward resource spelling out the meaning of and fix for the following BASH shell error, so I'm posting what I found after researching it.
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What does Maven do, in theory and in practice? When is it worth to use it? [closed]
I am about to start a Java project just for practice. I've read about Maven, but I don't actually understand when it is meant to be used.
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What's the difference between JPA and Spring Data JPA?
...ween Spring Data-JPA and JPA. I know about JPA that it is a specification for persisting the Java Objects to a relational database using popular ORM technology.
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Are static class instances unique to a request or a server in ASP.NET?
On an ASP.NET website, are static classes unique to each web request, or are they instantiated whenever needed and GCed whenever the GC decides to disposed of them?
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CentOS 64 bit bad ELF interpreter
...trying to install a 32-bit application on a 64-bit machine and got this error:
8 Answers
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What's the difference between eval, exec, and compile?
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The short answer, or TL;DR
Basically, eval is used to evaluate a single dynamically generated Python expression, and exec is used to execute dynamically generated Python code only for its side effects.
eval and exec have these tw...
Should an Enum start with a 0 or a 1?
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Framework Design Guidelines:
✔️ DO provide a value of zero on simple enums.
Consider calling the value something like "None." If such a value is not appropriate for this particular enum, the most common default value f...