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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
String textBlock = """
j \
a \t
v \s
a \
""";
System.out.println(textBlock.length());
What is the output?

A) 10
B) 11
C) 12
D) 14

2. 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" twice, 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" once, then exits normally.
E) It prints "Task is complete" once and throws an exception.

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

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

5. Given:
java
Map<String, Integer> map = Map.of("b", 1, "a", 3, "c", 2);
TreeMap<String, Integer> treeMap = new TreeMap<>(map);
System.out.println(treeMap);
What is the output of the given code fragment?

A) {a=3, b=1, c=2}
B) {a=1, b=2, c=3}
C) {c=2, a=3, b=1}
D) {c=1, b=2, a=3}
E) Compilation fails
F) {b=1, c=2, a=3}
G) {b=1, a=3, c=2}

Solutions: