Writing Scripts in Nashorn - Scripting in Java: Integrating with Groovy and JavaScript - page 123

// Bind properties of the java.util.HashSet object referenced by src to trg
Object.bindProperties(trg, src);
// Try iterating src properties
print("Iterating over trg properties:");
for (var propName in trg) {
print(propName);
}
Iterating over src properties:
Iterating over trg properties:
getClass
wait
notifyAll
notify
remove
removeAll
iterator
stream
hashCode
toArray
parallelStream
add
spliterator
forEach
containsAll
clear
isEmpty
removeIf
contains
size
addAll
equals
clone
toString
retainAll
class
empty