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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
public static void main(String[] args) {
try {
throw new IOException();
} catch (IOException e) {
throw new RuntimeException();
} finally {
throw new ArithmeticException();
}
}
What is the output?

A) RuntimeException
B) ArithmeticException
C) Compilation fails
D) IOException

2. What do the following print?
java
import java.time.Duration;
public class DividedDuration {
public static void main(String[] args) {
var day = Duration.ofDays(2);
System.out.print(day.dividedBy(8));
}
}

A) PT0D
B) PT0H
C) It throws an exception
D) Compilation fails
E) PT6H

3. Given:
java
Integer frenchRevolution = 1789;
Object o1 = new String("1789");
Object o2 = frenchRevolution;
frenchRevolution = null;
Object o3 = o2.toString();
System.out.println(o1.equals(o3));
What is printed?

A) false
B) A ClassCastException is thrown.
C) A NullPointerException is thrown.
D) true
E) Compilation fails.

4. Given:
java
var _ = 3;
var $ = 7;
System.out.println(_ + $);
What is printed?

A) 10
B) It throws an exception.
C) _$
D) Compilation fails.

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

Solutions: