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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
Deque<Integer> deque = new ArrayDeque<>();
deque.offer(1);
deque.offer(2);
var i1 = deque.peek();
var i2 = deque.poll();
var i3 = deque.peek();
System.out.println(i1 + " " + i2 + " " + i3);
What is the output of the given code fragment?

A) 2 1 1
B) 1 2 1
C) 1 1 1
D) 2 2 1
E) 1 2 2
F) An exception is thrown.
G) 2 2 2
H) 1 1 2
I) 2 1 2

2. Which of the following statements is correct about a final class?

A) It cannot implement any interface.
B) It cannot extend another class.
C) The final keyword in its declaration must go right before the class keyword.
D) It cannot be extended by any other class.
E) It must contain at least a final method.

3. What do the following print?
java
public class DefaultAndStaticMethods {
public static void main(String[] args) {
WithStaticMethod.print();
}
}
interface WithDefaultMethod {
default void print() {
System.out.print("default");
}
}
interface WithStaticMethod extends WithDefaultMethod {
static void print() {
System.out.print("static");
}
}

A) static
B) nothing
C) Compilation fails
D) default

4. Given:
java
var counter = 0;
do {
System.out.print(counter + " ");
} while (++counter < 3);
What is printed?

A) 1 2 3 4
B) 0 1 2
C) Compilation fails.
D) 0 1 2 3
E) An exception is thrown.
F) 1 2 3

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

Solutions: