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What is a mutex?
...eduling algorithm can swap between threads at any time, you don't know the order in which the threads will attempt to access the shared data. Therefore, the result of the change in data is dependent on the thread scheduling algorithm, i.e. both threads are "racing" to access/change the data.
Real li...
What is an Intent in Android?
...firstapp/starting-activity.html#BuildIntent
As the document describes, in order to start an activity (you also need to understand what activity is) use the intent like below
/** Called when the user clicks the Send button */
public void sendMessage(View view) {
Intent intent = new Intent(this,...
Why does Math.round(0.49999999999999994) return 1?
...ting, they took that bit out for Java 7 (the docs I linked to) -- maybe in order to avoid causing this sort of odd behavior by triggering a (further) loss of precision.
– T.J. Crowder
Mar 28 '12 at 7:46
...
How to sort an array based on the length of each element?
... elements that compare
equal do not necessarily remain in their original order).
If the objective is to sort by length then by dictionary order you must specify additional criteria:
["c", "a", "b"].sort(function(a, b) {
return a.length - b.length || // sort by length, if equal then
a...
Reference — What does this symbol mean in PHP?
...nd y have the same key/value pairs
in the same order and of the same types
x !== y Non-identity True if x is not identical to y
++ x Pre-increment Increments x by one, then returns x
x ++ Post-increment Returns x, then increments x by one
-- x Pr...
How does the static modifier affect this code?
... part of declaration. Declaration happens before assignment no matter what order you present them in. A obj = new A(); int num1; int num2 = 0; gets turned into this: A obj; int num1; int num2; obj = new A(); num2 = 0;. Java does this so num1, num2 are defined by the time you reach the new A() constr...
Delete duplicate records in SQL Server?
...
You can do this with window functions. It will order the dupes by empId, and delete all but the first one.
delete x from (
select *, rn=row_number() over (partition by EmployeeName order by empId)
from Employee
) x
where rn > 1;
Run it as a select to see what w...
What is the difference between the OAuth Authorization Code and Implicit workflows? When to use each
... something else, that the (browser) client needs to pass to the server, in order to allow the server to act on behalf of the particular client.
– Cheeso
Jun 29 '15 at 22:53
...
When writing a directive in AngularJS, how do I decide if I need no new scope, a new child scope, or
...ral directives (some nested inside others or adding attributes to them) in order to fully write in my own HTML, which is the purpose of a Domain Specific Language.
In the end, it's too weird to have to pass every global or shared value down the chain with multiple attributes on each DOM invocation ...
How to create a MySQL hierarchical recursive query
...
name,
parent_id
from (select * from products
order by parent_id, id) products_sorted,
(select @pv := '19') initialisation
where find_in_set(parent_id, @pv)
and length(@pv := concat(@pv, ',', id))
Here is a fiddle.
Here, the value specified in @pv := '19...