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Oracle Java SE 21 Developer Professional Sample Questions:

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

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

2. Which three of the following are correct about the Java module system?

A) If a package is defined in both a named module and the unnamed module, then the package in the unnamed module is ignored.
B) The unnamed module can only access packages defined in the unnamed module.
C) We must add a module descriptor to make an application developed using a Java version prior to SE9 run on Java 11.
D) If a request is made to load a type whose package is not defined in any known module, then the module system will attempt to load it from the classpath.
E) Code in an explicitly named module can access types in the unnamed module.
F) The unnamed module exports all of its packages.

3. 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) Peugeot 807
C) Peugeot
D) An exception is thrown at runtime.

4. What is the output of the following snippet? (Assume the file exists)
java
Path path = Paths.get("C:\\home\\joe\\foo");
System.out.println(path.getName(0));

A) C
B) Compilation error
C) C:
D) home
E) IllegalArgumentException

5. Consider the following methods to load an implementation of MyService using ServiceLoader. Which of the methods are correct? (Choose all that apply)

A) MyService service = ServiceLoader.load(MyService.class).iterator().next();
B) MyService service = ServiceLoader.load(MyService.class).findFirst().get();
C) MyService service = ServiceLoader.services(MyService.class).getFirstInstance();
D) MyService service = ServiceLoader.getService(MyService.class);

Solutions: