public class Holder<T>
extends java.lang.Object
A mutable holder class modeled on the JAX-WS 2.0 Holder class that simply provides a common way of providing an in/out parameter without the need to resort to untidy one length array parameters.
This can also be applied to cases where you need a return value back from a inner or local class. Take for example code that requires the use of the Runnable interface, the following code could be used:
final Holderh = new Holder(3); SwingUtilities.invokeAndWait(new Runnable() { public void run() { h.set(doSomethingClever()); } }); return 9 + h.get();
Ideally in the above exmaple you would use and API that could make
use of the Future
interface; but in many
cases API have not been updated.