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Oracle Java SE 21 Developer Professional Sample Questions:

1. A module com.eiffeltower.shop with the related sources in the src directory.
That module requires com.eiffeltower.membership, available in a JAR located in the lib directory.
What is the command to compile the module com.eiffeltower.shop?

A) css
CopyEdit
javac -path src -p lib/com.eiffel.membership.jar -d out -m com.eiffeltower.shop
B) css
CopyEdit
javac --module-source-path src -p lib/com.eiffel.membership.jar -s out -m com.eiffeltower.shop
C) css
CopyEdit
javac --module-source-path src -p lib/com.eiffel.membership.jar -d out -m com.eiffeltower.shop
D) bash
CopyEdit
javac -source src -p lib/com.eiffel.membership.jar -d out -m com.eiffeltower.shop

2. Which two of the following aren't the correct ways to create a Stream?

A) Stream stream = Stream.of();
B) Stream stream = Stream.ofNullable("a");
C) Stream stream = Stream.generate(() -> "a");
D) Stream stream = Stream.empty();
E) Stream stream = new Stream();
F) Stream<String> stream = Stream.builder().add("a").build();

3. Given:
java
double amount = 42_000.00;
NumberFormat format = NumberFormat.getCompactNumberInstance(Locale.FRANCE, NumberFormat.Style.
SHORT);
System.out.println(format.format(amount));
What is the output?

A) 42000E
B) 42 k
C) 42000
D) 42 000,00 €

4. Given:
java
int post = 5;
int pre = 5;
int postResult = post++ + 10;
int preResult = ++pre + 10;
System.out.println("postResult: " + postResult +
", preResult: " + preResult +
", Final value of post: " + post +
", Final value of pre: " + pre);
What is printed?

A) postResult: 16, preResult: 16, Final value of post: 6, Final value of pre: 6
B) postResult: 16, preResult: 15, Final value of post: 6, Final value of pre: 5
C) postResult: 15, preResult: 16, Final value of post: 5, Final value of pre: 6
D) postResult: 15, preResult: 16, Final value of post: 6, Final value of pre: 6

5. Which three of the following are correct about the Java module system?

A) The unnamed module can only access packages defined in the unnamed module.
B) If a request is made to load a type whose package is not defined in any known module, then the module system will attempt to load it from the classpath.
C) Code in an explicitly named module can access types in the unnamed module.
D) If a package is defined in both a named module and the unnamed module, then the package in the unnamed module is ignored.
E) The unnamed module exports all of its packages.
F) We must add a module descriptor to make an application developed using a Java version prior to SE9 run on Java 11.

Solutions: