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How does the String class override the + operator?
Why in Java you're able to add Strings with the + operator, when String is a class? In the String.java code I did not find any implementation for this operator. Does this concept violate object orientation?
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Counting DISTINCT over multiple columns
... the columns, then get the distinct count of instances of the concatenated string.
SELECT count(DISTINCT concat(DocumentId, DocumentSessionId)) FROM DocumentOutputItems;
In MySQL you can do the same thing without the concatenation step as follows:
SELECT count(DISTINCT DocumentId, DocumentSessio...
Why not infer template parameter from constructor?
...nd operator=). So suppose you are using your class like this :
MyClass m(string s);
MyClass *pm;
*pm = m;
I am not sure if it would be so obvious for the parser to know what template type is the MyClass pm;
Not sure if what I said make sense but feel free to add some comment, that's an interest...
String is immutable. What exactly is the meaning? [duplicate]
I wrote the following code on immutable Strings.
19 Answers
19
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List of Rails Model Types
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:binary
:boolean
:date
:datetime
:decimal
:float
:integer
:primary_key
:string
:text
:time
:timestamp
These are documented under column in the Active Record API.
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Securely storing environment variables in GAE with app.yaml
...m google.appengine.ext import ndb
class Settings(ndb.Model):
name = ndb.StringProperty()
value = ndb.StringProperty()
@staticmethod
def get(name):
NOT_SET_VALUE = "NOT SET"
retval = Settings.query(Settings.name == name).get()
if not retval:
retval = Settings()
retva...
How to write a scalable Tcp/Ip based server
...n.ReceiveBuffer.IndexOf('\n', index)) != -1)
{
string s = connection.ReceiveBuffer.GetString(start, index - start - 1);
s = s.Backspace();
LineReceivedEventArgs args = new LineReceivedEventArgs(connection, s);
Delegate[] de...
What is the difference between localStorage, sessionStorage, session and cookies?
...ilities, cookies, sessionStorage, and localStorage only allow you to store strings - it is possible to implicitly convert primitive values when setting (these will need to be converted back to use them as their type after reading) but not Objects or Arrays (it is possible to JSON serialise them to s...
Strip whitespace from jsp output
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Please, use the trim funcion, example
fn:trim(string1)
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Static nested class in Java, why?
...ass(1);
}
}
}
public class Test {
public static void main(String[] args) {
OuterClass.InnerClass.test();
// OuterClass outer = new OuterClass(1); // It is not possible to create outer instance from outside.
}
}
This will output x: 1
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