1Z0-811 Java Development and Deployment 2

Question 1

Which command compiles a Java source file named `Hello.java` and places the output in a directory called `out`?

Accepted Answer

javac -d out Hello.java

Answer

java -d out Hello.java

Answer

javac -cp out Hello.java

Answer

java -classpath out Hello.java

Question 2

What is the result of running `java -jar app.jar` when the manifest file has no `Main-Class` attribute?

Accepted Answer

An error is thrown indicating no main manifest attribute

Answer

The JVM searches for a class named Main

Answer

The first class in the JAR is executed

Answer

The program runs with an empty entry point

Question 3

Which module directive is used to allow reflective access to all packages in a module by a specific other module?

Accepted Answer

opens <package> to <module>

Answer

exports <package> to <module>

Answer

requires transitive <module>

Answer

provides with

Question 4

What does the `javap -c` command display for a `.class` file?

Accepted Answer

Disassembled JVM bytecode instructions

Answer

The source code of the class

Answer

The class hierarchy

Answer

The JAR manifest contents

Question 5

In a multi-release JAR, where should Java 11-specific class files be placed?

Accepted Answer

META-INF/versions/11/

Answer

META-INF/java11/

Answer

versions/11/

Answer

lib/java11/

Question 6

Which `java` command-line option sets the module path?

Accepted Answer

--module-path

Answer

--classpath

Answer

--module

Answer

--add-modules

Question 7

What happens when you use `requires transitive com.example.util;` in a module descriptor?

Accepted Answer

Modules that require your module automatically also read com.example.util

Answer

com.example.util is bundled inside your module's JAR

Answer

Your module exposes all packages of com.example.util publicly

Answer

com.example.util is loaded lazily at runtime