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Strings are objects in Java, so why don't we use 'new' to create them?
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In addition to what was already said, String literals [ie, Strings like "abcd" but not like new String("abcd")] in Java are interned - this means that every time you refer to "abcd", you get a reference to a single String instance, rather than a new one each time...
How to sort a file, based on its numerical values for a field?
...an page for sort...
-n, --numeric-sort
compare according to string numerical value
So here is an example...
sort -n filename
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Difference between ApiController and Controller in ASP.NET MVC
...ng things". Having classic MVC controllers returning "manually" serialized strings is easy enough. Adding a json/xml switch with http Accept verb doesn't take much. All that could be wrapped into a nice utility method.Thanks.
– ValGe
Jul 6 '19 at 7:16
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Is there some way to PUSH data from web server to browser?
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Yes, what you're looking for is COMET http://en.wikipedia.org/wiki/Comet_(programming). Other good Google terms to search for are AJAX-push and reverse-ajax.
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Difference between add(), replace(), and addToBackStack()
...k.
2) fragmentTransaction.replace(int containerViewId, Fragment fragment, String tag)
Description - Replace an existing fragment that was added to a container. This is essentially the same as calling remove(Fragment) for all currently added fragments that were added with the same containerViewId a...
Maximum single-sell profit
...oblem in each subarray, then combining the two together. Turns out we actually can do this, and can do so efficiently! The intuition is as follows. If we have a single day, the best option is to buy on that day and then sell it back on the same day for no profit. Otherwise, split the array into ...
Passing an array to a query using a WHERE clause
...prepare and execute the query as noted above.
Using the IN() operator with strings
It is easy to change between strings and integers because of the bound parameters. For PDO there is no change required; for MySQLi change str_repeat('i', to str_repeat('s', if you need to check strings.
[1]: I've omit...
Accessing the web page's HTTP Headers in JavaScript
... exactly equal to the current.
Use the following JavaScript code to get all the HTTP headers by performing a get request:
var req = new XMLHttpRequest();
req.open('GET', document.location, false);
req.send(null);
var headers = req.getAllResponseHeaders().toLowerCase();
alert(headers);
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Is it possible to perform a 'grep search' in all the branches of a Git project?
... to see more recent (relevant) changes first.
git log -p --all -S 'search string'
git log -p --all -G 'match regular expression'
These log commands list commits that add or remove the given search string/regex, (generally) more recent first. The -p option causes the relevant diff to be shown wher...
What's the “average” requests per second for a production web application?
... second vs. requests per second. I think requests/second is in that same ballpark(100 to 200) but with streaming it shoots up to 1140 records / second (doing ndjson). Anyways thought I would share more numbers. (not sure if this will change as that was tested streamed through 2 microservices into...