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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
List<String> l1 = new ArrayList<>(List.of("a", "b"));
List<String> l2 = new ArrayList<>(Collections.singletonList("c"));
Collections.copy(l1, l2);
l2.set(0, "d");
System.out.println(l1);
What is the output of the given code fragment?

A) [a, b]
B) An UnsupportedOperationException is thrown
C) [d, b]
D) [d]
E) An IndexOutOfBoundsException is thrown
F) [c, b]

2. Which of the following java.io.Console methods doesnotexist?

A) readLine(String fmt, Object... args)
B) read()
C) readLine()
D) readPassword(String fmt, Object... args)
E) readPassword()
F) reader()

3. Given:
java
var array1 = new String[]{ "foo", "bar", "buz" };
var array2[] = { "foo", "bar", "buz" };
var array3 = new String[3] { "foo", "bar", "buz" };
var array4 = { "foo", "bar", "buz" };
String array5[] = new String[]{ "foo", "bar", "buz" };
Which arrays compile? (Select 2)

A) array3
B) array4
C) array5
D) array2
E) array1

4. Given:
java
ExecutorService service = Executors.newFixedThreadPool(2);
Runnable task = () -> System.out.println("Task is complete");
service.submit(task);
service.shutdown();
service.submit(task);
What happens when executing the given code fragment?

A) It prints "Task is complete" once, then exits normally.
B) It exits normally without printing anything to the console.
C) It prints "Task is complete" twice and throws an exception.
D) It prints "Task is complete" twice, then exits normally.
E) It prints "Task is complete" once and throws an exception.

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: