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Like other ECMAScript implementations (like Rhino, v8) Nashorn supports mutable __proto__ magic property to read and write prototype of a given object. See also https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/proto

__proto__ is deprecated. Please avoid using __proto__. Use Object.getPrototypeOf and Object.setPrototypeOf instead.

Object.setPrototypeOf(obj, newProto)

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// print $JAVA_HOME and $PATH from the OS shell

print($ENV["JAVA_HOME"])
print($ENV["PATH"])
print($ENV.JAVA_HOME)
print($ENV.PATH)

Java object

"Java" global property is a script object that defines useful functions for script-to-Java interface.

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