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Java ArrayList how to add elements at the beginning
...add the element at the beginning of the array (so it has the lowest index) and if the array has 10 elements adding a new results in deleting the oldest element (the one with the highest index).
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boolean in an if statement
...-empty string value, any object or array reference, etc...
On the other hand:
if (booleanValue === true)
This will only satisfy the if condition if booleanValue is exactly equal to true. No other truthy value will satisfy it.
On the other hand if you do this:
if (someVar == true)
Then, wha...
How to add Action Bar from support library into PreferenceActivity?
...tivity class for creating activities with Action Bar on older versions of Android.
8 Answers
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Why does the C# compiler not fault code where a static method calls an instance method?
...C# 7.3 (May 2018). In What's new in C# 7.3, the section Improved overload candidates, item 1, it is explained how the overload resolution rules have changed so that non-static overloads are discarded early. So the below answer (and this entire question) has mostly only historical interest by now!
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How can I reference a commit in an issue comment on GitHub?
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To reference a commit, simply write its SHA-hash, and it'll automatically get turned into a link.
See also:
The Autolinked references and URLs / Commit SHAs section of
Writing on GitHub.
share
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Difference between private, public, and protected inheritance
...g "next:".
There are three accessors that I'm aware of: public, protected and private.
Let:
class Base {
public:
int publicMember;
protected:
int protectedMember;
private:
int privateMember;
};
Everything that is aware of Base is also aware that Base contai...
Backup/Restore a dockerized PostgreSQL database
...ne liner you will have to replace the cat your_dump.sql with the unzip command and pipe that instead of the cat result to docker exec.
– Tarion
May 4 '17 at 18:11
2
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How is Node.js inherently faster when it still relies on Threads internally?
I just watched the following video: Introduction to Node.js and still don't understand how you get the speed benefits.
6 ...
Prevent text selection after double click
I'm handling the dblclick event on a span in my web app. A side-effect is that the double click selects text on the page. How can I prevent this selection from happening?
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SQL DROP TABLE foreign key constraint
...ferencing your table, you could use this SQL (if you're on SQL Server 2005 and up):
SELECT *
FROM sys.foreign_keys
WHERE referenced_object_id = object_id('Student')
and if there are any, with this statement here, you could create SQL statements to actually drop those FK relations:
SELECT
'...