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

2. Given:
java
Stream<String> strings = Stream.of("United", "States");
BinaryOperator<String> operator = (s1, s2) -> s1.concat(s2.toUpperCase()); String result = strings.reduce("-", operator); System.out.println(result); What is the output of this code fragment?

A) -UnitedStates
B) -UnitedSTATES
C) -UNITEDSTATES
D) UNITED-STATES
E) United-States
F) United-STATES
G) UnitedStates

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

4. Given:
java
interface SmartPhone {
boolean ring();
}
class Iphone15 implements SmartPhone {
boolean isRinging;
boolean ring() {
isRinging = !isRinging;
return isRinging;
}
}
Choose the right statement.

A) An exception is thrown at running Iphone15.ring();
B) Everything compiles
C) Iphone15 class does not compile
D) SmartPhone interface does not compile

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: