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how to get the one entry from hashmap without iterating
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Maps are not ordered, so there is no such thing as 'the first entry', and that's also why there is no get-by-index method on Map (or HashMap).
You could do this:
Map<String, String> map = ...; // wherever you get this from
// Ge...
Java Regex Capturing Groups
...d since it's any character, it'll match as many characters as there are in order to fulfill the condition for the next groups).
In short, your 1st group .* matches anything as long as the next group \\d+ can match something (in this case, the last digit).
As per the 3rd group, it will match anyt...
Execute a command line binary with Node.js
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Might be worth pointing out that in order to do this example in Windows, one has to use 'cmd', ['/c', 'dir']. At least I was just searching high and low why 'dir' without arguments doesn't work before I remembered this... ;)
– AndyO
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Bootstrap NavBar with left, center or right aligned items
...her alignment scenarios demonstrated here.
The flexbox, auto-margins, and ordering utility classes can be used to align Navbar content as needed. There are many things to consider including the order and alignment of Navbar items (brand, links, toggler) on both large screens and the mobile/collapse...
Do try/catch blocks hurt performance when exceptions are not thrown?
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Can you try them in reverse order as well to be sure that JIT compilation hasn't had an effect on the former?
– JoshJordan
Aug 20 '09 at 20:04
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How to make a Java thread wait for another thread's output?
...ot use Java object like e.g. Windows Events.
The if the code runs in this order:
Thread 1: resultsReady.signal();
Thread 2: resultsReady.await();
then thread 2 will wait forever. This is because Object.notify() only wakes up one of the currently running threads. A thread waiting later is not awo...
Sorting a vector in descending order
Should I use
11 Answers
11
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What is NoSQL, how does it work, and what benefits does it provide? [closed]
...eplacement for more mainstream SQL databases, but a couple of words are in order to get things in the right perspective.
At the very heart of the NoSQL philosophy lies the consideration that, possibly for commercial and portability reasons, SQL engines tend to disregard the tremendous power of the...
Resizing an iframe based on content
...izePipe()">
<iframe id="helpframe" src='' height='0' width='0' frameborder='0'></iframe>
<script type="text/javascript">
function iframeResizePipe()
{
// What's the page height?
var height = document.body.scrollHeight;
// Going to 'pipe' the data to the pare...
Why can I initialize a List like an array in C#?
...gt; is the "simple" class, but compiler gives a special treatment to it in order to make your life easier.
This one is so called collection initializer. You need to implement IEnumerable<T> and Add method.
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