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Any reason to prefer getClass() over instanceof when generating .equals()?
...an treat objects of different type as non-equal by means of the getClass() test. The examples above illustrated nicely that implementations of equals() using getClass() are generally more robust than those implementations using instanceof .
The instanceof test is correct only for final classes or if...
Compare two Byte Arrays? (Java)
...ut I was unable to find a low level efficient function to perform equality test ranges. I had to whip up my own, if anyone needs it:
public static boolean ArraysAreEquals(
byte[] first,
int firstOffset,
int firstLength,
byte[] second,
int secondOffset,
int secondLength
) {
if( firstLength...
How do I create a new line in Javascript?
...ML tag for a newline:
document.write("<br>");
The string Hello\n\nTest in your source will look like this:
Hello!
Test
The string Hello<br><br>Test will look like this in HTML source:
Hello<br><br>Test
The HTML one will render as line breaks for the person vie...
Why doesn't Java allow to throw a checked exception from static initialization block?
...ver from it.
In most cases, the exception cannot be caught:
public class Test {
static {
int i = 1;
if (i == 1) {
throw new RuntimeException("Bang!");
}
}
public static void main(String[] args) {
try {
// stuff
} catch (T...
MySQL: What's the difference between float and double?
...
Perhaps this example could explain.
CREATE TABLE `test`(`fla` FLOAT,`flb` FLOAT,`dba` DOUBLE(10,2),`dbb` DOUBLE(10,2));
We have a table like this:
+-------+-------------+
| Field | Type |
+-------+-------------+
| fla | float |
| flb | float |
| dba ...
Spring AOP vs AspectJ
...in conjunction with the aspectj-maven-plugin then you are able to run unit tests against your aspects in a CI environment and have confidence that built artifacts are tested and correctly woven. While you can certainly write Spring driven unit tests, you still have no guarantee that the deployed cod...
How to create a private class method?
...thermore, the method is operating
# solely upon 'reference' and 'under_test' and will be flagged as having
# low cohesion by quality metrics unless made a class method.
def self.compare(reference, under_test)
# special floating point comparison
(reference - under_test).ab...
Should I make HTML Anchors with 'name' or 'id'?
...ir order within the page), Chrome and Firefox will jump to the id, but IE (tested in 11) and Edge will jump to the name
– Alvaro Montoro
Aug 5 '16 at 2:11
...
Getting a list of all subdirectories in the current directory
...differences between os.walk and os.listdir+os.path.isdir solutions: I just tested on a directory with 10,000 subdirectories (with millions of files in the hierarchy below) and the performance differences are negligible. os.walk: "10 loops, best of 3: 44.6 msec per loop" and os.listdir+os.path.isdir:...
Using str_replace so that it only acts on the first match?
... properly escaped because of preg_quote's second parameter (one can easily test that). I'd be interested to hear about specific issues (which would be serious PCRE security bugs in my book).
– MvanGeest
Jan 31 '17 at 2:30
...