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 var timerTimer = new (Java.type("java.util.Timer"))
 timerTimer.schedule(function() { print("Hello World!") }, 1000)
 java.lang.System.in.read()

Here, Timer.schedule() expects a TimerTask as its argument, so Nashorn creates an instance of a TimerTask subclass and uses the passed function to implement its only abstract method, run(). In this usage though, you can't use non-default constructors; the type must be either an interface, or must have a protected or public no-arg constructor.

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