In a Java environment, which class provides an interface for invoking JavaScript methods and examining JavaScript properties from code running inside the Java virtual machine?

Introduction / Context:
When Java code embeds a browser component or interacts with a web page, there is often a need to call JavaScript functions or read properties of JavaScript objects from within the Java virtual machine. The classic example is Java applets or browser integrated Java components that must communicate with the page that hosts them. This question checks whether you know the specific bridge class that provides an interface from Java to JavaScript.

Given Data / Assumptions:

• We are working in a Java environment that can host or integrate with a browser.
• We need a class that allows invoking JavaScript methods and reading or writing JavaScript properties.
• The options show similar looking names, so recognising the exact class name is important.

Concept / Approach:
The netscape.javascript.JSObject class is historically used to represent a JavaScript object and offers methods that allow Java code to call JavaScript functions, get properties, and set properties. This class is part of the bridge between applet code and the surrounding web page. The other options such as ScriptObject or JavaObject are plausible sounding names but do not represent this specific mechanism in standard Java browser integration.

Step-by-Step Solution:
Step 1: Recall that in the classic applet model, the Java to JavaScript bridge is provided by the JSObject class in the netscape.javascript package. Step 2: Note that JSObject offers methods such as call, getMember, and setMember to interact with JavaScript objects and functions. Step 3: Compare the given options: ScriptObject, JSObject, JavaObject, and Jobject. Step 4: Recognise that JSObject matches the known class name exactly and that case also matters. Step 5: Choose JSObject as the class that provides the required interface for invoking JavaScript and examining JavaScript properties.

Verification / Alternative check:
If you have ever looked at example code for a Java applet interacting with a browser, you may recall patterns where you obtain a JSObject that represents the window object and then call methods on it. This practical memory helps verify that JSObject is the correct answer. You can also remember that the package name netscape.javascript hints at its origin in Netscape browsers, which historically provided this integration.

Why Other Options Are Wrong:
Option A: ScriptObject is a plausible name but it is not the standard Java class used for this Java to JavaScript bridge. Option C: JavaObject is a generic sounding name and does not refer to a specific standard class used for JavaScript interaction. Option D: Jobject does not match any standard Java class name and also uses incorrect capitalisation compared to typical Java naming conventions.

Common Pitfalls:
A common mistake is to remember only part of the name and then choose an option that looks similar but is not exact. In exams, small differences like JSObject versus ScriptObject are used to test careful reading and accurate recall. Another pitfall is to confuse modern JavaScript engine integration libraries with the older applet based JSObject bridge. Always match your answer to the precise wording of the question.

Final Answer:
The class that provides an interface for invoking JavaScript methods and examining JavaScript properties is JSObject.