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Oracle Java SE 21 Developer Professional Sample Questions:

1. Which of the following statements are correct?

A) You can use 'final' modifier with all kinds of classes
B) You can use 'public' access modifier with all kinds of classes
C) None
D) You can use 'protected' access modifier with all kinds of classes
E) You can use 'private' access modifier with all kinds of classes

2. 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.

3. 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) Compilation fails
C) truetruetrue
D) truetruefalse
E) falsetruetrue

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

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

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

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

Solutions: