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.toArray(new MyClass[0]) or .toArray(new MyClass[myList.size()])?
...re below, showing that the version with an empty array consistently outperforms the version with a presized array. Note that if you can reuse an existing array of the correct size, the result may be different.
Benchmark results (score in microseconds, smaller = better):
Benchmark ...
Why can't overriding methods throw exceptions broader than the overridden method?
...e overriding method in a subclass can only declare to throw that exception or its subclass. For example:
class A {
public void foo() throws IOException {..}
}
class B extends A {
@Override
public void foo() throws SocketException {..} // allowed
@Override
public void foo() throws S...
Why do we use __init__ in Python classes?
...__init__ doesn't initialize a class, it initializes an instance of a class or an object. Each dog has colour, but dogs as a class don't. Each dog has four or fewer feet, but the class of dogs doesn't. The class is a concept of an object. When you see Fido and Spot, you recognise their similarity, th...
How much does it cost to develop an iPhone application? [closed]
How much can a developer charge for an iPhone app like Twitterrific ?
10 Answers
10
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Java logical operator short-circuiting
Which set is short-circuiting, and what exactly does it mean that the complex conditional expression is short-circuiting?
9...
Check whether variable is number or string in JavaScript
Does anyone know how can I check whether a variable is a number or a string in JavaScript?
32 Answers
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What are the differences between a HashMap and a Hashtable in Java?
...htable is synchronized, whereas HashMap is not. This makes HashMap better for non-threaded applications, as unsynchronized Objects typically perform better than synchronized ones.
Hashtable does not allow null keys or values. HashMap allows one null key and any number of null values.
One of HashMap...
python: how to identify if a variable is an array or a scalar
...rgument NBins . I want to make a call to this function with a scalar 50 or an array [0, 10, 20, 30] . How can I identify within the function, what the length of NBins is? or said differently, if it is a scalar or a vector?
...
Check if passed argument is file or directory in Bash
... simple script in Ubuntu which would allow me to pass it either a filename or a directory, and be able to do something specific when it's a file, and something else when it's a directory. The problem I'm having is when the directory name, or probably files too, has spaces or other escapable charact...
PDOException SQLSTATE[HY000] [2002] No such file or directory
I believe that I've successfully deployed my (very basic) site to fortrabbit, but as soon as I connect to SSH to run some commands (such as php artisan migrate or php artisan db:seed ) I get an error message:
...