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How do I create a right click context menu in Java Swing?
... is a bit old - as are the answers (and the tutorial as well)
The current api for setting a popupMenu in Swing is
myComponent.setComponentPopupMenu(myPopupMenu);
This way it will be shown automagically, both for mouse and keyboard triggers (the latter depends on LAF). Plus, it supports re-using ...
What's the difference between SoftReference and WeakReference in Java?
...
Weak Reference
http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/ref/WeakReference.html
Principle: weak reference is related to garbage collection. Normally, object having one or more reference will not be eligible for garbage collection.
The above principle is not applicabl...
What is “lifting” in Scala?
...rovides unlift to help with construction of JSON serialisers:
import play.api.libs.json._
import play.api.libs.functional.syntax._
case class Location(lat: Double, long: Double)
implicit val locationWrites: Writes[Location] = (
(JsPath \ "lat").write[Double] and
(JsPath \ "long").write[Double...
Payment Processors - What do I need to know if I want to accept credit cards on my website? [closed]
... The payment gateway vendors provide a way to talk to the Internet Gateway API that you will communicate with. Most vendors provide HTTP or TCP/IP communication with their API. They will process the credit card information on your behalf. Two vendors are Authorize.Net and PayFlow Pro. The link I...
Android: Difference between Parcelable and Serializable?
...pose serialization mechanism. This class (and the corresponding Parcelable API for placing arbitrary objects into a Parcel) is designed as a high-performance IPC transport. As such, it is not appropriate to place any Parcel data in to persistent storage: changes in the underlying implementation of a...
Understanding implicit in Scala
...
Actions are explained on this page from the Play documentation (see also API docs). You are using
apply(block: (Request[AnyContent]) ⇒ Result): Action[AnyContent]
on the Action object (which is the companion to the trait of the same name).
So we need to supply a Function as the argument, wh...
Where should I put tags in HTML markup?
...using external scripts that support callbacks. Many third party JavaScript APIs now support non-blocking execution. Here is an example of loading the Google Maps API asynchronously.
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When to use the different log levels
... be immediately visible on a status console.
warn:
Use of deprecated APIs, poor use of API, 'almost' errors, other runtime situations that are undesirable or unexpected, but not necessarily "wrong". Expect these to be immediately visible on a status console.
info:
Interesting runtime eve...
Using Java 8's Optional with Stream::flatMap
...:stream)
.findFirst();
Java 8
Yes, this was a small hole in the API, in that it's somewhat inconvenient to turn an Optional<T> into a zero-or-one length Stream<T>. You could do this:
Optional<Other> result =
things.stream()
.map(this::resolve)
.fl...
If strings are immutable in .NET, then why does Substring take O(n) time?
... and allows for the pointer to be passed in a P/Invoke to Win32 (or other) APIs which expect a null-terminated string.
When you do Substring(0, 5) the "oh, but I promised there'd be a null-character after the last character" rule says you need to make a copy. Even if you got the substring at the e...