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Oracle Java SE 21 Developer Professional Sample Questions:

1. Which of the following isn't a valid option of the jdeps command?

A) --print-module-deps
B) --generate-open-module
C) --list-deps
D) --list-reduced-deps
E) --check-deps
F) --generate-module-info

2. Given:
java
void verifyNotNull(Object input) {
boolean enabled = false;
assert enabled = true;
assert enabled;
System.out.println(input.toString());
assert input != null;
}
When does the given method throw a NullPointerException?

A) Only if assertions are disabled and the input argument isn't null
B) Only if assertions are disabled and the input argument is null
C) Only if assertions are enabled and the input argument isn't null
D) Only if assertions are enabled and the input argument is null
E) A NullPointerException is never thrown

3. What do the following print?
java
public class DefaultAndStaticMethods {
public static void main(String[] args) {
WithStaticMethod.print();
}
}
interface WithDefaultMethod {
default void print() {
System.out.print("default");
}
}
interface WithStaticMethod extends WithDefaultMethod {
static void print() {
System.out.print("static");
}
}

A) nothing
B) static
C) Compilation fails
D) default

4. Given:
java
public class Versailles {
int mirrorsCount;
int gardensHectares;
void Versailles() { // n1
this.mirrorsCount = 17;
this.gardensHectares = 800;
System.out.println("Hall of Mirrors has " + mirrorsCount + " mirrors."); System.out.println("The gardens cover " + gardensHectares + " hectares.");
}
public static void main(String[] args) {
var castle = new Versailles(); // n2
}
}
What is printed?

A) nginx
Hall of Mirrors has 17 mirrors.
The gardens cover 800 hectares.
B) Nothing
C) Compilation fails at line n2.
D) An exception is thrown at runtime.
E) Compilation fails at line n1.

5. Given:
java
List<Long> cannesFestivalfeatureFilms = LongStream.range(1, 1945)
.boxed()
.toList();
try (var executor = Executors.newVirtualThreadPerTaskExecutor()) {
cannesFestivalfeatureFilms.stream()
.limit(25)
.forEach(film -> executor.submit(() -> {
System.out.println(film);
}));
}
What is printed?

A) An exception is thrown at runtime
B) Numbers from 1 to 25 randomly
C) Numbers from 1 to 1945 randomly
D) Numbers from 1 to 25 sequentially
E) Compilation fails

Solutions: