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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
void verifyNotNull(Object input) {
boolean enabled = false;
assert enabled = true;
assert enabled;
System.out.println(input.toString());
assert input != null;
}
When does the given method throw a NullPointerException?

A) Only if assertions are enabled and the input argument isn't null
B) Only if assertions are disabled and the input argument is null
C) Only if assertions are disabled and the input argument isn't null
D) Only if assertions are enabled and the input argument is null
E) A NullPointerException is never thrown

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

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

4. Given:
java
LocalDate localDate = LocalDate.of(2020, 8, 8);
Date date = java.sql.Date.valueOf(localDate);
DateFormat formatter = new SimpleDateFormat(/* pattern */);
String output = formatter.format(date);
System.out.println(output);
It's known that the given code prints out "August 08".
Which of the following should be inserted as the pattern?

A) MM dd
B) MM d
C) MMMM dd
D) MMM dd

5. Given:
java
Stream<String> strings = Stream.of("United", "States");
BinaryOperator<String> operator = (s1, s2) -> s1.concat(s2.toUpperCase()); String result = strings.reduce("-", operator); System.out.println(result); What is the output of this code fragment?

A) -UnitedSTATES
B) UnitedStates
C) UNITED-STATES
D) United-States
E) United-STATES
F) -UnitedStates
G) -UNITEDSTATES

Solutions: