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How to maintain a Unique List in Java?
...contain no pair of elements e1 and e2 such that e1.equals(e2), and at most one null element. As implied by its name, this interface models the mathematical set abstraction.
Note: Great care must be exercised if mutable objects are used as set elements. The behavior of a set is not specified if ...
Table name as variable
...
For static queries, like the one in your question, table names and column names need to be static.
For dynamic queries you should generate the full SQL dynamically, and use sp_executesql to execute it.
Here is an example of a script used to compare da...
What is the best way to filter a Java Collection?
...
Java 8 (2014) solves this problem using streams and lambdas in one line of code:
List<Person> beerDrinkers = persons.stream()
.filter(p -> p.getAge() > 16).collect(Collectors.toList());
Here's a tutorial.
Use Collection#removeIf to modify the collection in place. (Not...
“Unknown provider: aProvider
...site in Chrome, with the DevTools open. Which results in an error like the one below being logged:
The method in the call trace we're interested in, is the one I marked with an arrow. This is providerInjector in injector.js. You're going to want to place a breakpoint where it throws an exception:...
How should I have explained the difference between an Interface and an Abstract class?
In one of my interviews, I have been asked to explain the difference between an Interface and an Abstract class .
30 Ans...
Time complexity of Euclid's Algorithm
...
One trick for analyzing the time complexity of Euclid's algorithm is to follow what happens over two iterations:
a', b' := a % b, b % (a % b)
Now a and b will both decrease, instead of only one, which makes the analysis ea...
Where is Android Studio layout preview?
...n. Now if you want to see the layout design preview you will need to press one of the buttons at the top right of your xml. The button that looks like an image icon will open the design dashboard, while the button next to it will open the split view where the design is placed next to the XML code:
...
Rails: How to change the text on the submit button in a Rails Form
...tion (very easy navigation / search)
Sometimes, a google search like the one below helps:
Google: site:api.rubyonrails.org f.submit
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is there a Java equivalent to null coalescing operator (??) in C#? [duplicate]
...imported using import static syntax)
public static <T> T coalesce(T one, T two)
{
return one != null ? one : two;
}
The above is equivalent to Guava's method firstNonNull by @ColinD, but that can be extended more in general
public static <T> T coalesce(T... params)
{
for (T p...
Delete all the queues from RabbitMQ?
... list queues name
Then from the list, you'll need to manually delete them one by one:
rabbitmqadmin delete queue name='queuename'
Because of the output format, doesn't appear you can grep the response from list queues. Alternatively, if you're just looking for a way to clear everything (read: re...