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Is it possible to cast a Stream in Java 8?
...tanceof Client)
.map(c -> (Client) c)
.map(Client::getID)
.forEach(System.out::println);
or, as suggested in the comments, you could use the cast method - the former may be easier to read though:
Stream.of(objects)
.filter(Client.class::isInstance)
.map(Client.class::cast)
...
Remove the last line from a file in Bash
...sed versions older than 3.95, so you have to use it as a filter with a temporary file:
cp foo.txt foo.txt.tmp
sed '$ d' foo.txt.tmp > foo.txt
rm -f foo.txt.tmp
Of course, in that case you could also use head -n -1 instead of sed.
MacOS:
On Mac OS X (as of 10.7.4), the equivalent of the sed -...
Difference between WAIT and BLOCKED thread states
... waiting state, it will need to wait till some other thread calls notify() or notifyAll() on the object.
Once this thread is notified, it will not be runnable. It might be that other threads are also notified (using notifyAll()) or the first thread has not finished his work, so it is still blocked ...
How to pass an ArrayList to a varargs method parameter?
...method
Use the toArray(T[] arr) method.
.getMap(locations.toArray(new WorldLocation[locations.size()]))
(toArray(new WorldLocation[0]) also works, but you would allocate a zero length array for no reason.)
Here's a complete example:
public static void method(String... strs) {
for (Stri...
When to use virtual destructors?
I have a solid understanding of most OOP theory but the one thing that confuses me a lot is virtual destructors.
17 Answe...
What's the best practice for primary keys in tables?
...e as small as necessary. Prefer a numeric type because numeric types are stored in a much more compact format than character formats. This is because most primary keys will be foreign keys in another table as well as used in multiple indexes. The smaller your key, the smaller the index, the less pag...
GCD to perform task in main thread
...t come from any thread. When I get this callback, then I would like to perform a certain task on the main thread.
4 Answers...
Multiple lines of text in UILabel
...a way to have multiple lines of text in UILabel like in the UITextView or should I use the second one instead?
25 Answe...
Int or Number DataType for DataAnnotation validation attribute
On my MVC3 project, I store score prediction for football/soccer/hockey/... sport game. So one of properties of my prediction class looks like this:
...
JavaScript arrays braces vs brackets
...
With brackets or dot notation: myObject["someValue"] or myObject.someValue . The empty object created by {} will of course not have those properties, but you can assign to them in the same way: myObject.someValue = "hello!"
...