1Z0-819 Modular Development & Deployment Practices 2

Question 1

Which `module-info.java` directive allows a module to read another module's types without the consuming module explicitly requiring it?

Accepted Answer

requires transitive

Answer

`requires transitive` causes any module that requires the current module to also implicitly read the specified dependency.

Question 2

A developer runs `java --list-modules`. What does this command display?

Accepted Answer

All observable system modules bundled with the JDK

Answer

`--list-modules` without additional arguments lists all observable system (platform) modules available in the running JDK.

Question 3

Which tool is used to link a set of modules into a custom runtime image in Java 11?

Accepted Answer

jlink

Answer

`jlink` assembles and optimizes a set of modules and their transitive dependencies into a custom, self-contained runtime image.

Question 4

What happens when you place a modular JAR on the class path instead of the module path?

Accepted Answer

The module-info.class is ignored and the JAR is treated as unnamed module content

Answer

When a modular JAR is placed on the class path, `module-info.class` is ignored and its classes become part of the unnamed module.

Question 5

Which command-line option allows code in an unnamed module to access a specific package in a named module at runtime?

Accepted Answer

--add-exports

Answer

`--add-exports` makes a package in a named module accessible to another module (or unnamed module) without modifying `module-info.java`.

(1Z0-819) Oracle Java SE 11 Developer Practice Test