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Oracle Java SE 21 Developer Professional Sample Questions:

1. 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

2. What does the following code print?
java
import java.util.stream.Stream;
public class StreamReduce {
public static void main(String[] args) {
Stream<String> stream = Stream.of("J", "a", "v", "a");
System.out.print(stream.reduce(String::concat));
}
}

A) null
B) Optional[Java]
C) Java
D) Compilation fails

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

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

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

5. Given:
java
List<Long> cannesFestivalfeatureFilms = LongStream.range(1, 1945)
.boxed()
.toList();
try (var executor = Executors.newVirtualThreadPerTaskExecutor()) {
cannesFestivalfeatureFilms.stream()
.limit(25)
.forEach(film -> executor.submit(() -> {
System.out.println(film);
}));
}
What is printed?

A) Numbers from 1 to 1945 randomly
B) An exception is thrown at runtime
C) Compilation fails
D) Numbers from 1 to 25 sequentially
E) Numbers from 1 to 25 randomly

Solutions: