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String.equals versus == [duplicate]
...ue can actually be compared with ==, but it's better not to rely on that.
if (usuario.equals(datos[0])) {
...
}
NB: the compare is done on 'usuario' because that's guaranteed non-null in your code, although you should still check that you've actually got some tokens in the datos array otherwi...
Why is there no multiple inheritance in Java, but implementing multiple interfaces is allowed?
...
Because interfaces specify only what the class is doing, not how it is doing it.
The problem with multiple inheritance is that two classes may define different ways of doing the same thing, and the subclass can't choose which one to pick.
...
When is a function too long? [closed]
... fast rules for it. Generally I like my methods to just "do one thing". So if it's grabbing data, then doing something with that data, then writing it to disk then I'd split out the grabbing and writing into separate methods so my "main" method just contains the "doing something".
That "doing somet...
PHP multidimensional array search by value
...searchForId($id, $array) {
foreach ($array as $key => $val) {
if ($val['uid'] === $id) {
return $key;
}
}
return null;
}
This will work. You should call it like this:
$id = searchForId('100', $userdb);
It is important to know that if you are using === operat...
How does java do modulus calculations with negative numbers?
...umbers are in use - some languages use one definition and some the other.
If you want to get a negative number for negative inputs then you can use this:
int r = x % n;
if (r > 0 && x < 0)
{
r -= n;
}
Likewise if you were using a language that returns a negative number on a neg...
CSRF Token necessary when using Stateless(= Sessionless) Authentication?
...ests"
http://angular-tips.com/blog/2014/05/json-web-tokens-introduction/
"If we go down the cookies way, you really need to do CSRF to avoid cross site requests. That is something we can forget when using JWT as you will see."
(JWT = Json Web Token, a Token based authentication for stateless apps)
...
App Inventor 2 Web客户端（Web）详细用法示例 · App Inventor 2 中文网
...网 IP（Windows 运行 ipconfig 看「IPv4 地址」，macOS/Linux 运行 ifconfig 或 ip addr），例如 192.168.1.23。
中途验证：手机浏览器打开 http://192.168.1.23:8768/，同样看到 {"uploads": []}。打不开就先解决网络问题（见下方排错表），App 里也一定...
ValueError: invalid literal for int() with base 10: ''
I am creating a program that reads a file and if the first line of the file is not blank, it reads the next four lines. Calculations are performed on those lines and then the next line is read. If that line is not empty it continues. However, I am getting this error:
...
SQL Server Insert if not exists
...SUNTO
AND Data = @_DATA);
END
replace with
BEGIN
IF NOT EXISTS (SELECT * FROM EmailsRecebidos
WHERE De = @_DE
AND Assunto = @_ASSUNTO
AND Data = @_DATA)
BEGIN
INSERT INTO EmailsRecebidos (De, Assunto, Data)...
Left padding a String with Zeros [duplicate]
...
If your string contains numbers only, you can make it an integer and then do padding:
String.format("%010d", Integer.parseInt(mystring));
If not I would like to know how it can be done.
...