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Oracle Java SE 21 Developer Professional Sample Questions:

1. 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.

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

3. Given:
java
Map<String, Integer> map = Map.of("b", 1, "a", 3, "c", 2);
TreeMap<String, Integer> treeMap = new TreeMap<>(map);
System.out.println(treeMap);
What is the output of the given code fragment?

A) {b=1, c=2, a=3}
B) {b=1, a=3, c=2}
C) Compilation fails
D) {a=3, b=1, c=2}
E) {a=1, b=2, c=3}
F) {c=2, a=3, b=1}
G) {c=1, b=2, a=3}

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

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

5. Given:
java
System.out.print(Boolean.logicalAnd(1 == 1, 2 < 1));
System.out.print(Boolean.logicalOr(1 == 1, 2 < 1));
System.out.print(Boolean.logicalXor(1 == 1, 2 < 1));
What is printed?

A) truefalsetrue
B) truetruefalse
C) Compilation fails
D) truetruetrue
E) falsetruetrue

Solutions: