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Spring MVC: How to perform validation?
... business validation logic, conditional validation across multiple fields, etc.), or for some reason you cannot use method 1, use manual validation. It is a good practice to separate the controller’s code from the validation logic. Don't create your validation class(es) from scratch, Spring provid...
How should I unit test threaded code?
... test the complicated behaviour (multi- threading, asynchronous execution, etc...)
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How is “=default” different from “{}” for default constructor and destructor?
...tions (default constructor, copy/move constructors/assignment, destructors etc) means something very different from simply doing {}. With the latter, the function becomes "user-provided". And that changes everything.
This is a trivial class by C++11's definition:
struct Trivial
{
int foo;
};
I...
What does the CSS rule “clear: both” do?
... 90% of CSS beginners: why the background of a container element is not stretched when it holds floated elements. It's because the container element is a POOL here and the POOL has no idea how many objects are floating, or what the length or breadth of the floated elements are, so it simply won't s...
What's the better (cleaner) way to ignore output in PowerShell? [closed]
...me who are fluent in PowerShell aren't even familiar with [void], $null =, etc., and just because those may execute faster or take less keystrokes to type, doesn't mean they're the best way to do what you're trying to do, and just because a language gives you quirky syntax doesn't mean you should us...
JavaScript: Class.method vs. Class.prototype.method
... class itself...? (That's like saying a subset of a set is the set itself, etc...)
– Andrew
Apr 2 at 5:03
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Should I return a Collection or a Stream?
... if the caller filters the stream to return only lines matching a pattern, etc.
An idiom that seems to be emerging is to name stream-returning methods after the plural of the name of the things that it represents or contains, without a get prefix. Also, while stream() is a reasonable name for a str...
How do I give text or an image a transparent background using CSS?
...if you want to do something fancier (e.g. animation, multiple backgrounds, etc.), or if you don't want to rely on CSS3, you can try the “pane technique”:
.pane, .pane > .back, .pane > .cont { display: block; }
.pane {
position: relative;
}
.pane > .back {
position: absolute;
...
What is the difference between shallow copy, deepcopy and normal assignment operation?
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In python, when we assign objects like list, tuples, dict, etc to another object usually with a ' = ' sign, python creates copy’s by reference. That is, let’s say we have a list of list like this :
list1 = [ [ 'a' , 'b' , 'c' ] , [ 'd' , 'e' , 'f' ] ]
and we assign another li...
What is the difference between MVC and MVVM? [closed]
...l only make sense when using WPF's two way data binding. Otherwise MVC/MVP etc would be sufficient.
– Jeff
Sep 20 '10 at 23:42
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