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Oracle Java SE 21 Developer Professional Sample Questions:

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

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

2. 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 25 randomly
B) Numbers from 1 to 1945 randomly
C) An exception is thrown at runtime
D) Compilation fails
E) Numbers from 1 to 25 sequentially

3. Given:
java
List<String> l1 = new ArrayList<>(List.of("a", "b"));
List<String> l2 = new ArrayList<>(Collections.singletonList("c"));
Collections.copy(l1, l2);
l2.set(0, "d");
System.out.println(l1);
What is the output of the given code fragment?

A) An UnsupportedOperationException is thrown
B) [c, b]
C) [a, b]
D) [d, b]
E) An IndexOutOfBoundsException is thrown
F) [d]

4. Given:
java
public class ThisCalls {
public ThisCalls() {
this(true);
}
public ThisCalls(boolean flag) {
this();
}
}
Which statement is correct?

A) It does not compile.
B) It throws an exception at runtime.
C) It compiles.

5. Given:
java
sealed class Vehicle permits Car, Bike {
}
non-sealed class Car extends Vehicle {
}
final class Bike extends Vehicle {
}
public class SealedClassTest {
public static void main(String[] args) {
Class<?> vehicleClass = Vehicle.class;
Class<?> carClass = Car.class;
Class<?> bikeClass = Bike.class;
System.out.print("Is Vehicle sealed? " + vehicleClass.isSealed() +
"; Is Car sealed? " + carClass.isSealed() +
"; Is Bike sealed? " + bikeClass.isSealed());
}
}
What is printed?

A) Is Vehicle sealed? true; Is Car sealed? true; Is Bike sealed? true
B) Is Vehicle sealed? false; Is Car sealed? false; Is Bike sealed? false
C) Is Vehicle sealed? true; Is Car sealed? false; Is Bike sealed? false
D) Is Vehicle sealed? false; Is Car sealed? true; Is Bike sealed? true

Solutions: