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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

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

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

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

4. Given:
java
var frenchCities = new TreeSet<String>();
frenchCities.add("Paris");
frenchCities.add("Marseille");
frenchCities.add("Lyon");
frenchCities.add("Lille");
frenchCities.add("Toulouse");
System.out.println(frenchCities.headSet("Marseille"));
What will be printed?

A) Compilation fails
B) [Paris]
C) [Lille, Lyon]
D) [Lyon, Lille, Toulouse]
E) [Paris, Toulouse]

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

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

Solutions: