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Oracle Java SE 21 Developer Professional Sample Questions:

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

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

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

3. 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) ArithmeticException
B) IOException
C) Compilation fails
D) RuntimeException

4. Given:
var cabarets = new TreeMap<>();
cabarets.put(1, "Moulin Rouge");
cabarets.put(2, "Crazy Horse");
cabarets.put(3, "Paradis Latin");
cabarets.put(4, "Le Lido");
cabarets.put(5, "Folies Bergere");
System.out.println(cabarets.subMap(2, true, 5, false));
What is printed?

A) CopyEdit{2=Crazy Horse, 3=Paradis Latin, 4=Le Lido, 5=Folies Bergere}
B) {2=Crazy Horse, 3=Paradis Latin, 4=Le Lido}
C) {}
D) Compilation fails.
E) An exception is thrown at runtime.

5. Given:
java
interface Calculable {
long calculate(int i);
}
public class Test {
public static void main(String[] args) {
Calculable c1 = i -> i + 1; // Line 1
Calculable c2 = i -> Long.valueOf(i); // Line 2
Calculable c3 = i -> { throw new ArithmeticException(); }; // Line 3
}
}
Which lines fail to compile?

A) Line 1 and line 3
B) Line 3 only
C) Line 1 and line 2
D) Line 1 only
E) The program successfully compiles
F) Line 2 only
G) Line 2 and line 3

Solutions: