OCP Java Platform Module System 3

Question 1

In a `module-info.java`, which directive is used to declare that a module consumes a service defined by an interface?

Accepted Answer

uses

Answer

The `uses` directive declares that the module is a consumer of a service interface via ServiceLoader.

Question 2

What does the `--limit-modules` command-line option do during module resolution?

Accepted Answer

Restricts the universe of observable modules to a given set

Answer

`--limit-modules` restricts the observable module universe to the specified modules and their transitive dependencies.

Question 3

Which of the following correctly declares a service provider in module-info.java for a service interface `com.api.Processor` with implementation `com.impl.FastProcessor`?

Accepted Answer

provides com.api.Processor with com.impl.FastProcessor;

Answer

The `provides ... with` directive registers a concrete implementation class for a service interface in the module system.

Question 4

Which module contains the `java.lang` package in a standard JDK modular installation?

Accepted Answer

java.base

Answer

`java.base` is the foundational module that contains core packages like java.lang, java.util, and java.io.

Question 5

What is the name derived for an automatic module created from a JAR file named `my-library-2.1.0.jar` when no Automatic-Module-Name manifest entry is present?

Accepted Answer

my.library

Answer

The JVM strips version numbers and converts hyphens to dots, deriving `my.library` as the automatic module name.

(OCP) Oracle Certified Professional Practice Test

(OCP) Oracle Certified Professional Practice Test

OCP Java Platform Module System 3