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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
var frenchCities = new TreeSet<String>();
frenchCities.add("Paris");
frenchCities.add("Marseille");
frenchCities.add("Lyon");
frenchCities.add("Lille");
frenchCities.add("Toulouse");
System.out.println(frenchCities.headSet("Marseille"));
What will be printed?

A) [Lille, Lyon]
B) [Paris]
C) [Paris, Toulouse]
D) Compilation fails
E) [Lyon, Lille, Toulouse]

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

3. Given:
java
var deque = new ArrayDeque<>();
deque.add(1);
deque.add(2);
deque.add(3);
deque.add(4);
deque.add(5);
System.out.print(deque.peek() + " ");
System.out.print(deque.poll() + " ");
System.out.print(deque.pop() + " ");
System.out.print(deque.element() + " ");
What is printed?

A) 1 1 1 1
B) 1 1 2 3
C) 1 1 2 2
D) 1 5 5 1
E) 5 5 2 3

4. Given:
java
var hauteCouture = new String[]{ "Chanel", "Dior", "Louis Vuitton" };
var i = 0;
do {
System.out.print(hauteCouture[i] + " ");
} while (i++ > 0);
What is printed?

A) Chanel
B) An ArrayIndexOutOfBoundsException is thrown at runtime.
C) Chanel Dior Louis Vuitton
D) Compilation fails.

5. Which of the following suggestions compile?(Choose two.)

A) java
public sealed class Figure
permits Circle, Rectangle {}
final class Circle extends Figure {
float radius;
}
non-sealed class Rectangle extends Figure {
float length, width;
}
B) java
sealed class Figure permits Rectangle {}
final class Rectangle extends Figure {
float length, width;
}
C) java
sealed class Figure permits Rectangle {}
public class Rectangle extends Figure {
float length, width;
}
D) java
public sealed class Figure
permits Circle, Rectangle {}
final sealed class Circle extends Figure {
float radius;
}
non-sealed class Rectangle extends Figure {
float length, width;
}

Solutions: