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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
public static void main(String[] args) {
try {
throw new IOException();
} catch (IOException e) {
throw new RuntimeException();
} finally {
throw new ArithmeticException();
}
}
What is the output?

A) Compilation fails
B) RuntimeException
C) IOException
D) ArithmeticException

2. Given:
java
var array1 = new String[]{ "foo", "bar", "buz" };
var array2[] = { "foo", "bar", "buz" };
var array3 = new String[3] { "foo", "bar", "buz" };
var array4 = { "foo", "bar", "buz" };
String array5[] = new String[]{ "foo", "bar", "buz" };
Which arrays compile? (Select 2)

A) array3
B) array4
C) array5
D) array2
E) array1

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

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

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

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) Compilation fails
C) Numbers from 1 to 25 randomly
D) Numbers from 1 to 25 sequentially
E) Numbers from 1 to 1945 randomly

Solutions: