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Why can't strings be mutable in Java and .NET?
...ctly one state, the state in which it was created. If you make sure
that all constructors establish class invariants, then it is
guaranteed that these invariants will remain true for all time, with
no effort on your part.
[...]
Immutable objects are inherently thread-safe; they requi...
Difference between webdriver.Dispose(), .Close() and .Quit()
...ose the browser window that the driver has focus of
webDriver.Quit() - Calls Dispose()
webDriver.Dispose() Closes all browser windows and safely ends the session
The code below will dispose the driver object, ends the session and closes all browsers opened during a test whether the test fa...
Ukkonen's suffix tree algorithm in plain English
...thm.
First, a few preliminary statements.
What we are building, is basically like a search trie. So there
is a root node, edges going out of it leading to new nodes, and
further edges going out of those, and so forth
But: Unlike in a search trie, the edge labels are not single
characters. Instead...
Android - get children inside a View?
...
If you not only want to get all direct children but all children's children and so on, you have to do it recursively:
private ArrayList<View> getAllChildren(View v) {
if (!(v instanceof ViewGroup)) {
ArrayList<View> viewArrayLi...
How do I migrate an SVN repository with history to a new Git repository?
I read the Git manual, FAQ, Git - SVN crash course, etc. and they all explain this and that, but nowhere can you find a simple instruction like:
...
When to use RSpec let()?
...sn't use any of the instance variables defined in the hook. This isn't usually a big deal, but if the setup of the instance variable takes a long time, then you're wasting cycles. For the method defined by let, the initialization code only runs if the example calls it.
You can refactor from a loca...
MySQL SELECT only not null values
...hough...
SELECT val1 AS val
FROM your_table
WHERE val1 IS NOT NULL
UNION ALL
SELECT val2
FROM your_table
WHERE val2 IS NOT NULL
/*And so on for all your columns*/
The disadvantage of the above is that it scans the table multiple times once for each column. That may possibly be avoided by the b...
What to learn for making Java web applications in Java EE 6? [closed]
...s so cooool), and use Tomcat (and why not Jetty), or JBoss, or just forget all this and go for Grails, and bla bla bla...".
But I don't think that this is really helping you and, without mentoring or guidance (and you won't find a non outdated unique resource covering all combinations), this must ...
How to delete duplicates on a MySQL table?
...
The above query deleted all of my records except one :(
– Zolbayar
Aug 10 at 3:21
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Returning 'IList' vs 'ICollection' vs 'Collection'
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Generally you should return a type that is as general as possible, i.e. one that knows just enough of the returned data that the consumer needs to use. That way you have greater freedom to change the implementation of the API, wit...