1Z0-819 Modules System 2

Question 1

What keyword is used in a module-info.java to grant reflective access to all packages in a module to another module?

Accepted Answer

opens

Answer

The 'opens' directive grants deep reflective access (including private members) to another module at runtime.

Question 2

Which command-line option adds a module to the set of root modules resolved by the module system?

Accepted Answer

--add-modules

Answer

'--add-modules' explicitly adds one or more modules to the root module set during resolution.

Question 3

In module-info.java, 'requires transitive com.example.api;' means that:

Accepted Answer

Any module requiring the current module implicitly also requires com.example.api

Answer

'requires transitive' creates an implied readability dependency so consumers of your module also read com.example.api without declaring it themselves.

Question 4

Which command inspects the module descriptor of a modular JAR file?

Accepted Answer

jar --describe-module

Answer

'jar --describe-module' (or '-d') prints the module descriptor of a modular JAR file.

Question 5

What happens when you place a non-modular JAR on the module path?

Accepted Answer

It becomes an automatic module with a name derived from the JAR filename

Answer

Non-modular JARs on the module path become automatic modules, with a name derived from the JAR filename or Automatic-Module-Name manifest entry.

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

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

1Z0-819 Modules System 2