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Oracle Java SE 21 Developer Professional Sample Questions:

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

2. Which two of the following aren't the correct ways to create a Stream?

A) Stream stream = Stream.of();
B) Stream stream = Stream.empty();
C) Stream stream = Stream.ofNullable("a");
D) Stream<String> stream = Stream.builder().add("a").build();
E) Stream stream = Stream.generate(() -> "a");
F) Stream stream = new Stream();

3. Given:
java
System.out.print(Boolean.logicalAnd(1 == 1, 2 < 1));
System.out.print(Boolean.logicalOr(1 == 1, 2 < 1));
System.out.print(Boolean.logicalXor(1 == 1, 2 < 1));
What is printed?

A) Compilation fails
B) truetruetrue
C) falsetruetrue
D) truetruefalse
E) truefalsetrue

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

5. Which of the following methods of java.util.function.Predicate aredefault methods?

A) isEqual(Object targetRef)
B) or(Predicate<? super T> other)
C) and(Predicate<? super T> other)
D) not(Predicate<? super T> target)
E) test(T t)
F) negate()

Solutions: