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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.*;

/**
 * Example of controlling the JavaScript execution engine.
 *
 * We evaluate a script and then manipulate the result.
 *
 */
public class Control {

    /**
     * Main entry point.
     *
     * Process arguments as would a normal Java program. Also
     * create a new Context and associate it with the current thread.
     * Then set up the execution environment and begin to
     * execute scripts.
     */
    public static void main(String[] args)
    {
        Context cx = Context.enter();
        try {
            // Set version to JavaScript1.2 so that we get object-literal style
            // printing instead of "[object Object]"
            cx.setLanguageVersion(Context.VERSION_1_2);

            // Initialize the standard objects (Object, Function, etc.)
            // This must be done before scripts can be executed.
            Scriptable scope = cx.initStandardObjects();

            // Now we can evaluate a script. Let's create a new object
            // using the object literal notation.
            Object result = cx.evaluateString(scope, "obj = {a:1, b:['x','y']}",
                                              "MySource", 1, null);

            Scriptable obj = (Scriptable) scope.get("obj", scope);

            // Should print "obj == result" (Since the result of an assignment
            // expression is the value that was assigned)
            System.out.println("obj " + (obj == result ? "==" : "!=") +
                               " result");

            // Should print "obj.a == 1"
            System.out.println("obj.a == " + obj.get("a", obj));

            Scriptable b = (Scriptable) obj.get("b", obj);

            // Should print "obj.b[0] == x"
            System.out.println("obj.b[0] == " + b.get(0, b));

            // Should print "obj.b[1] == y"
            System.out.println("obj.b[1] == " + b.get(1, b));

            // Should print {a:1, b:["x", "y"]}
            Function fn = (Function) ScriptableObject.getProperty(obj, "toString");
            System.out.println(fn.call(cx, scope, obj, new Object[0]));
        } finally {
            Context.exit();
        }
    }

}