Take Java's Calendar and DateFormat classes (but oddly not their GregorianCalendar and SimpleDateFormat classes). You can have any number of Calendars and DateFormats in a program.

Must qualify the allocation with an enclosing instance of type GameTree (e.g. x.new A () where x is an instance of GameTree). GameTree.java line 146</pre> ...

Developers who create a runnable Java class, be it for a ‘Hello World’ demonstration or to kick off a fully featured enterprise application, will enjoy the following technical benefits when using ...

The syntax Calendar.metaClass.getZodiakTropicalSign = { -> defines a new method getZodiakTrpopicalSign on Calendar and then uses delegate to work with the underlying instance of java.util.Calendar.