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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
var now = LocalDate.now();
var format1 = new DateTimeFormatter(ISO_WEEK_DATE);
var format2 = DateTimeFormatter.ISO_WEEK_DATE;
var format3 = new DateFormat(WEEK_OF_YEAR_FIELD);
var format4 = DateFormat.getDateInstance(WEEK_OF_YEAR_FIELD);
System.out.println(now.format(REPLACE_HERE));
Which variable prints 2025-W01-2 (present-day is 12/31/2024)?

A) format3
B) format1
C) format2
D) format4

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

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

3. Given:
java
Deque<Integer> deque = new ArrayDeque<>();
deque.offer(1);
deque.offer(2);
var i1 = deque.peek();
var i2 = deque.poll();
var i3 = deque.peek();
System.out.println(i1 + " " + i2 + " " + i3);
What is the output of the given code fragment?

A) 2 1 1
B) 1 2 1
C) 1 1 1
D) 2 2 1
E) 1 2 2
F) An exception is thrown.
G) 2 2 2
H) 1 1 2
I) 2 1 2

4. Given:
java
Optional o1 = Optional.empty();
Optional o2 = Optional.of(1);
Optional o3 = Stream.of(o1, o2)
.filter(Optional::isPresent)
.findAny()
.flatMap(o -> o);
System.out.println(o3.orElse(2));
What is the given code fragment's output?

A) Optional.empty
B) An exception is thrown
C) 2
D) 1
E) 0
F) Compilation fails
G) Optional[1]

5. Given:
java
CopyOnWriteArrayList<String> list = new CopyOnWriteArrayList<>();
list.add("A");
list.add("B");
list.add("C");
// Writing in one thread
new Thread(() -> {
list.add("D");
System.out.println("Element added: D");
}).start();
// Reading in another thread
new Thread(() -> {
for (String element : list) {
System.out.println("Read element: " + element);
}
}).start();
What is printed?

A) Compilation fails.
B) It prints all elements, including changes made during iteration.
C) It prints all elements, but changes made during iteration may not be visible.
D) It throws an exception.

Solutions: