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Java Singleton and Synchronization
... code a “classic” singleton that works in a multithreaded environment (starting from Java 1.5) you should use this one.
public class Singleton {
private static volatile Singleton instance = null;
private Singleton() {
}
public static Singleton getInstance() {
if (instance == null...
Comparing numbers in Bash
I'm starting to learn about writing scripts for the bash terminal, but I can't work out how to get the comparisons to work properly. The script I'm using is:
...
How do I clear my local working directory in Git? [duplicate]
...h you will be using
If you're a forward thinking individual, you might start your repository off on the right foot by basing everything on an initial empty commit...
git init
git commit --allow-empty --allow-empty-message -m ""
git tag empty
...
There are various uses for a tagged empty wor...
Jquery change background color
...,"red");
What are valid values for the id attribute in HTML?
ID's cannot start with digits!!!
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How can I find all matches to a regular expression in Python?
...earch in a loop. It'll return a Match object. You'll want to pass in Match.start() + 1 as the pos argument for re.search for the next iteration of the loop.
– ArtOfWarfare
May 31 '17 at 17:31
...
jQuery SVG, why can't I addClass?
...ce technique ) ... but would it be an idea to edit the question so that it starts by stating that jquery can't add a class to an SVG ( if that's the case ... as it seems )?
– byronyasgur
Dec 15 '14 at 23:33
...
This type of CollectionView does not support changes to its SourceCollection from a thread different
...t refers to an updated github gist version of the code that appears at the start of the post.
– Greg Trevellick
Apr 14 '18 at 7:15
...
How to read and write excel file
... // This trick ensures that we get the data properly even if it doesn't start from first few rows
for(int i = 0; i < 10 || i < rows; i++) {
row = sheet.getRow(i);
if(row != null) {
tmp = sheet.getRow(i).getPhysicalNumberOfCells();
if(tmp > cols...
Backbone.js: `extend` undefined?
Just getting started with Backbone.js. Simply including Backbone (either dev/production versions) causes the error:
3 Answe...
Focus Next Element In Tab Index
...e
);
walker.currentNode = currentElement;
if (!walker.nextNode())
{
// Restart search from the start of the document
walker.currentNode = walker.root;
walker.nextNode();
}
if (walker.currentNode && walker.currentNode != walker.root)
walker.currentNode.focus();
This only considers s...