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Oracle Java SE 21 Developer Professional Sample Questions:

1. Consider the following methods to load an implementation of MyService using ServiceLoader. Which of the methods are correct? (Choose all that apply)

A) MyService service = ServiceLoader.load(MyService.class).iterator().next();
B) MyService service = ServiceLoader.services(MyService.class).getFirstInstance();
C) MyService service = ServiceLoader.load(MyService.class).findFirst().get();
D) MyService service = ServiceLoader.getService(MyService.class);

2. Given:
java
package vehicule.parent;
public class Car {
protected String brand = "Peugeot";
}
and
java
package vehicule.child;
import vehicule.parent.Car;
public class MiniVan extends Car {
public static void main(String[] args) {
Car car = new Car();
car.brand = "Peugeot 807";
System.out.println(car.brand);
}
}
What is printed?

A) Peugeot 807
B) An exception is thrown at runtime.
C) Peugeot
D) Compilation fails.

3. Given:
java
var _ = 3;
var $ = 7;
System.out.println(_ + $);
What is printed?

A) It throws an exception.
B) _$
C) 10
D) Compilation fails.

4. Given:
java
interface A {
default void ma() {
}
}
interface B extends A {
static void mb() {
}
}
interface C extends B {
void ma();
void mc();
}
interface D extends C {
void md();
}
interface E extends D {
default void ma() {
}
default void mb() {
}
default void mc() {
}
}
Which interface can be the target of a lambda expression?

A) A
B) C
C) None of the above
D) B
E) E
F) D

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

Solutions: