1Z0-811 Java Development and Deployment 3

Question 1

Which tool introduced in Java 9+ creates a custom runtime image containing only the modules your application needs?

Accepted Answer

jlink

Answer

`jlink` assembles a custom runtime image from a set of modules, reducing the deployment footprint.

Question 2

What is the purpose of the `jdeps` tool?

Accepted Answer

Analyze class and package-level dependencies of a JAR or class file

Answer

`jdeps` analyzes dependencies between packages and modules, helping identify which modules a class or JAR requires.

Question 3

Which file in a JAR is responsible for specifying the Main-Class and other metadata?

Accepted Answer

META-INF/MANIFEST.MF

Answer

The `MANIFEST.MF` file inside `META-INF/` stores JAR metadata including `Main-Class`, `Class-Path`, and custom attributes.

Question 4

When compiling with modules, which flag adds a module to the set of root modules without editing module-info.java?

Accepted Answer

--add-modules

Answer

`--add-modules` lets you include additional modules in the module graph without modifying module descriptors.

Question 5

What is the default access level for a package inside a named module that does NOT use an `exports` directive?

Accepted Answer

The package is inaccessible to all other modules

Answer

In the module system, packages that are not explicitly exported are encapsulated and inaccessible to code in other modules.

(1Z0-811) Oracle Java SE11 Programmer Practice Test