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Rhino is an open-source implementation of JavaScript written entirely in Java. It is typically embedded into Java applications to provide scripting to end users.

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/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

import org.mozilla.javascript.*;

/**
 * RunScript: simplest example of controlling execution of Rhino.
 *
 * Collects its arguments from the command line, executes the
 * script, and prints the result.
 *
 * @author Norris Boyd
 */
public class RunScript {
    public static void main(String args[])
    {
        // Creates and enters a Context. The Context stores information
        // about the execution environment of a script.
        Context cx = Context.enter();
        try {
            // Initialize the standard objects (Object, Function, etc.)
            // This must be done before scripts can be executed. Returns
            // a scope object that we use in later calls.
            Scriptable scope = cx.initStandardObjects();

            // Collect the arguments into a single string.
            String s = "";
            for (int i=0; i < args.length; i++) {
                s += args[i];
            }

            // Now evaluate the string we've colected.
            Object result = cx.evaluateString(scope, s, "", 1, null);

            // Convert the result to a string and print it.
            System.err.println(Context.toString(result));

        } finally {
            // Exit from the context.
            Context.exit();
        }
    }
}