samples/sam_function.js

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// nashorn supports passing script functions whenever
// a SAM (single abstract method) type object is expected

var System = Java.type("java.lang.System");
var Timer = Java.type("java.util.Timer");
var timer = new Timer();

// schedule method accepts java.util.TimerTask
// which is a single-abstract-method type. you
// can pass a script function and nashorn will
// wrap it as SAM implementor.

timer.schedule(function() {
    print("Hello World!");
}, 1000);

// wait for timer thread to print by
// reading from stdin.
print("press any key to exit after message from timer...");
System.in.read();