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How to format a number 0..9 to display with 2 digits (it's NOT a date)
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You can use:
String.format("%02d", myNumber)
See also the javadocs
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What are Long-Polling, Websockets, Server-Sent Events (SSE) and Comet?
...ee HTTP above).
The client receives the requested webpage and executes the JavaScript on the page which requests a file from the server at regular intervals (e.g. 0.5 seconds).
The server calculates each response and sends it back, just like normal HTTP traffic.
Ajax Long-Polling:
A client req...
Handle spring security authentication exceptions with @ExceptionHandler
... private static final boolean jaxb2Present =
ClassUtils.isPresent("javax.xml.bind.Binder", MessageProcessor.class.getClassLoader());
private static final boolean jackson2Present =
ClassUtils.isPresent("com.fasterxml.jackson.databind.ObjectMapper", MessageProcessor.class.getClass...
Calculating distance between two points, using latitude longitude?
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The Java code given by Dommer above gives slightly incorrect results but the small errors add up if you are processing say a GPS track. Here is an implementation of the Haversine method in Java which also takes into account heigh...
Detect whether there is an Internet connection available on Android [duplicate]
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The code is good, I just wish people would stick to Java coding style when writing java haveConnectedWifi, haveConnectedMobile. I know it's a small thing, but consistent code is more readable.
– Stuart Axon
Dec 9 '10 at 16:37
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Key hash for Android-Facebook app
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the command should be executed in the bin folder of java in windows systems.
– Antrromet
Feb 15 '12 at 4:31
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Combine multiple Collections into a single logical Collection?
... seen the read-only requirement earlier).
From the Iterables.concat( .. ) JavaDocs:
Combines multiple iterables into a
single iterable. The returned iterable
has an iterator that traverses the
elements of each iterable in inputs.
The input iterators are not polled
until necessary. The...
What are good uses for Python3's “Function Annotations”
...emselves invaluable for enabling smart static analyzers for languages like Java. For instance, you could define semantics like state restrictions, threads that are allowed to access, architecture limitations, etc., and there are quite a few tools that can then read these and process them to provide ...
browser sessionStorage. share between tabs?
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Here is a solution to prevent session shearing between browser tabs for a java application. This will work for IE
(JSP/Servlet)
In your first JSP page, onload event call a servlet (ajex call) to setup a "window.title" and event tracker in the session(just a integer variable to be set as 0 for fir...
Simplest/Cleanest way to implement singleton in JavaScript?
What is the simplest/cleanest way to implement singleton pattern in JavaScript?
37 Answers
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