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Oracle 1z1-830 Exam Syllabus Topics:

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

2. Given:
java
var deque = new ArrayDeque<>();
deque.add(1);
deque.add(2);
deque.add(3);
deque.add(4);
deque.add(5);
System.out.print(deque.peek() + " ");
System.out.print(deque.poll() + " ");
System.out.print(deque.pop() + " ");
System.out.print(deque.element() + " ");
What is printed?

A) 1 5 5 1
B) 5 5 2 3
C) 1 1 2 2
D) 1 1 1 1
E) 1 1 2 3

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

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

4. Given:
java
var sList = new CopyOnWriteArrayList<Customer>();
Which of the following statements is correct?

A) The CopyOnWriteArrayList class's iterator reflects all additions, removals, or changes to the list since the iterator was created.
B) The CopyOnWriteArrayList class is not thread-safe and does not prevent interference amongconcurrent threads.
C) Element-changing operations on iterators of CopyOnWriteArrayList, such as remove, set, and add, are supported and do not throw UnsupportedOperationException.
D) The CopyOnWriteArrayList class does not allow null elements.
E) The CopyOnWriteArrayList class is a thread-safe variant of ArrayList where all mutative operations are implemented by making a fresh copy of the underlying array.

5. Given:
java
record WithInstanceField(String foo, int bar) {
double fuz;
}
record WithStaticField(String foo, int bar) {
static double wiz;
}
record ExtendingClass(String foo) extends Exception {}
record ImplementingInterface(String foo) implements Cloneable {}
Which records compile? (Select 2)

A) WithStaticField
B) WithInstanceField
C) ImplementingInterface
D) ExtendingClass

Solutions: