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

2. Given:
java
int post = 5;
int pre = 5;
int postResult = post++ + 10;
int preResult = ++pre + 10;
System.out.println("postResult: " + postResult +
", preResult: " + preResult +
", Final value of post: " + post +
", Final value of pre: " + pre);
What is printed?

A) postResult: 15, preResult: 16, Final value of post: 5, Final value of pre: 6
B) postResult: 16, preResult: 16, Final value of post: 6, Final value of pre: 6
C) postResult: 16, preResult: 15, Final value of post: 6, Final value of pre: 5
D) postResult: 15, preResult: 16, Final value of post: 6, Final value of pre: 6

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

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

4. How would you create a ConcurrentHashMap configured to allow a maximum of 10 concurrent writer threads and an initial capacity of 42?
Which of the following options meets this requirement?

A) var concurrentHashMap = new ConcurrentHashMap(42, 10);
B) var concurrentHashMap = new ConcurrentHashMap();
C) var concurrentHashMap = new ConcurrentHashMap(42, 0.88f, 10);
D) var concurrentHashMap = new ConcurrentHashMap(42);
E) None of the suggestions.

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

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

Solutions: