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Oracle Java SE 21 Developer Professional Sample Questions:

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

2. Given:
java
public class SpecialAddition extends Addition implements Special {
public static void main(String[] args) {
System.out.println(new SpecialAddition().add());
}
int add() {
return --foo + bar--;
}
}
class Addition {
int foo = 1;
}
interface Special {
int bar = 1;
}
What is printed?

A) 1
B) 2
C) 0
D) Compilation fails.
E) It throws an exception 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) {a=3, b=1, c=2}
C) {a=1, b=2, c=3}
D) {b=1, a=3, c=2}
E) {c=2, a=3, b=1}
F) Compilation fails
G) {c=1, b=2, a=3}

4. Which of the following methods of java.util.function.Predicate aredefault methods?

A) negate()
B) and(Predicate<? super T> other)
C) isEqual(Object targetRef)
D) or(Predicate<? super T> other)
E) not(Predicate<? super T> target)
F) test(T t)

5. Given:
java
Runnable task1 = () -> System.out.println("Executing Task-1");
Callable<String> task2 = () -> {
System.out.println("Executing Task-2");
return "Task-2 Finish.";
};
ExecutorService execService = Executors.newCachedThreadPool();
// INSERT CODE HERE
execService.awaitTermination(3, TimeUnit.SECONDS);
execService.shutdownNow();
Which of the following statements, inserted in the code above, printsboth:
"Executing Task-2" and "Executing Task-1"?

A) execService.execute(task1);
B) execService.submit(task2);
C) execService.submit(task1);
D) execService.call(task2);
E) execService.run(task2);
F) execService.execute(task2);
G) execService.run(task1);
H) execService.call(task1);

Solutions: