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Java code To convert byte to Hexadecimal
...is sign-extended to a 32-bit int. To effectively undo this sign extension, one can mask the byte with 0xFF.
byte b = -1;
System.out.println(Integer.toHexString(b & 0xFF));
// prints "ff"
Another issue with using toHexString is that it doesn't pad with zeroes:
byte b = 10;
...
Solving a “communications link failure” with JDBC and MySQL [duplicate]
...s to solve this problem. I have tested many approaches that have been mentioned in different web sites, but non of them worked. Finally I changed my code and found out what was the problem. I'll try to tell you about different approaches and sum them up here.
While I was seeking the internet to fin...
setNeedsLayout vs. setNeedsUpdateConstraints and layoutIfNeeded vs updateConstraintsIfNeeded
...out autolayouts–says:
If something changes later on that invalidates one of your constraints, you should remove the constraint immediately and call setNeedsUpdateConstraints. In fact, that’s the only case where you should have to trigger a constraint update pass.
In addition, in my experie...
What is the best way to test for an empty string in Go?
...taste and about clarity.
Russ Cox writes in a golang-nuts thread:
The one that makes the code clear.
If I'm about to look at element x I typically write
len(s) > x, even for x == 0, but if I care about
"is it this specific string" I tend to write s == "".
It's reasonable to assu...
SQL Update with row_number()
...
One more option
UPDATE x
SET x.CODE_DEST = x.New_CODE_DEST
FROM (
SELECT CODE_DEST, ROW_NUMBER() OVER (ORDER BY [RS_NOM]) AS New_CODE_DEST
FROM DESTINATAIRE_TEMP
) x
...
Use String.split() with multiple delimiters
...
Try this regex "[-.]+". The + after treats consecutive delimiter chars as one. Remove plus if you do not want this.
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Adding dictionaries together, Python [duplicate]
I have two dictionaries and I'd like to be able to make them one:
6 Answers
6
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Mutable vs immutable objects
...
Great response. One small question however: doesn't C++ have good support for immutability? Isn't the const-correctness feature sufficient?
– Dimitri C.
Sep 2 '10 at 7:13
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Should struct definitions go in .h or .c file?
... of struct s in headers and just declarations—is there any advantage to one method over the other?
6 Answers
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How to manage a redirect request after a jQuery Ajax call
...problem to yours. I perform an AJAX request that has 2 possible responses: one that redirects the browser to a new page and one that replaces an existing HTML form on the current page with a new one. The jQuery code to do this looks something like:
$.ajax({
type: "POST",
url: reqUrl,
da...