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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Advanced Java Features (Java SE 21) | - Modern language features
|
| Database Connectivity (JDBC) | - Database interaction
|
| Core APIs | - Java standard library usage
|
| Concurrency and Multithreading | - Thread management
|
| Java Language Fundamentals | - Java syntax and language structure
|
| Exception Handling and Debugging | - Error handling mechanisms
|
| Input/Output and File Handling | - NIO and file operations
|
| Object-Oriented Programming | - Core OOP principles
|
Oracle 1z0-830 Exam: Frequently Asked Questions
The 1z0-830 exam is the official exam behind the Oracle Certified Professional credential from Oracle. It sits at the Professional level of the Oracle certification track. It is also associated with Oracle Certified Professional: Java SE 17 Developer, Oracle Certified Professional: Java SE 11 Developer. The ExamTorrent practice questions on this page map to the same objectives, so you can measure your readiness before you book a seat.
The 1z0-830 exam contains 50-60 questions and gives you 90 minutes to complete them. That pace leaves little room for getting stuck, so train yourself to flag a hard question, move on, and circle back later. Run at least one full timed session in the ExamTorrent test engine a week before your exam date to check whether your pacing holds under pressure.
You need 68% to pass the 1z0-830 exam, and the official registration fee is USD 245 (may vary by region). A retake means paying that fee again in full, which makes thorough preparation the cheaper option by far. Before scheduling, take a timed ExamTorrent practice test; if you are not scoring comfortably above the passing line, give yourself more study time instead of booking on hope.
No strict prerequisite, but prior Java programming experience recommended
Requirements can change, so confirm the latest details on the official Oracle exam page before you register.
You can book the 1z0-830 exam through the following official channels:
The exam is delivered Online proctored or test center-based exam, so pick the option that suits you when booking.
Oracle points candidates to these official courses:
Once you have worked through the official material, wrap up your preparation with the 85 practice questions from ExamTorrent to lock in what you have learned.
Yes. A free 1z0-830 PDF demo is available, so you can check the question style and answer quality before you commit. Every purchase also includes 365 days of free updates, and if your product expires after that, you can extend the update service at a 50% discount from your member zone.
Your purchase is protected by our 100% Money Back Guarantee. If you take the 1z0-830 exam within 60 days of purchase and do not pass, send us a scanned enrollment slip and your official Score Report PDF within two days of the exam; approved refunds are processed within seven days. The candidate name must match the payer name, and the guarantee does not apply to exams taken within three days of purchase, to products that were downloaded but never used in an exam sitting, or to free materials and expired orders. If you would rather keep studying, we can instead exchange your order for two free exam products of equal value while your original product keeps its update service. Delivery itself is instant: your download is emailed within one minute of payment and stays available in your member zone, with no limit on how many computers you can install it on. If nothing arrives within two hours, contact our customer service team.
The 1z0-830 syllabus is divided into 8 domains, including Object-Oriented Programming, Input/Output and File Handling, and Core APIs. The complete breakdown, with every domain and its subtopics, is listed in the Exam Topics section above — review it line by line and flag the areas where you feel weakest.
Oracle Java SE 21 Developer Professional Sample Questions:
Which of the following methods of java.util.function.Predicate aredefault methods?
- A. or(Predicate<? super T> other)
- B. test(T t)
- C. negate()
- D. not(Predicate<? super T> target)
- E. isEqual(Object targetRef)
- F. and(Predicate<? super T> other)
Correct Answer: A,C,F 🗳️
Explanation: Only visible for ExamTorrent members. You can sign-up / login (it's free).
Given:
java
LocalDate localDate = LocalDate.of(2020, 8, 8);
Date date = java.sql.Date.valueOf(localDate);
DateFormat formatter = new SimpleDateFormat(/* pattern */);
String output = formatter.format(date);
System.out.println(output);
It's known that the given code prints out "August 08".
Which of the following should be inserted as the pattern?
- A. MMM dd
- B. MM d
- C. MM dd
- D. MMMM dd
Correct Answer: D 🗳️
Explanation: Only visible for ExamTorrent members. You can sign-up / login (it's free).
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. Only if assertions are disabled and the input argument is null
- C. Only if assertions are disabled and the input argument isn't null
- D. A NullPointerException is never thrown
- E. Only if assertions are enabled and the input argument isn't null
Correct Answer: B 🗳️
Explanation: Only visible for ExamTorrent members. You can sign-up / login (it's free).
Given:
java
StringBuilder result = Stream.of("a", "b")
.collect(
() -> new StringBuilder("c"),
StringBuilder::append,
(a, b) -> b.append(a)
);
System.out.println(result);
What is the output of the given code fragment?
- A. cacb
- B. abc
- C. acb
- D. cba
- E. bca
- F. cbca
- G. bac
Correct Answer: D 🗳️
Explanation: Only visible for ExamTorrent members. You can sign-up / login (it's free).
Given:
java
public class Test {
public static void main(String[] args) throws IOException {
Path p1 = Path.of("f1.txt");
Path p2 = Path.of("f2.txt");
Files.move(p1, p2);
Files.delete(p1);
}
}
In which case does the given program throw an exception?
- A. Both files f1.txt and f2.txt exist
- B. File f2.txt exists while file f1.txt doesn't
- C. Neither files f1.txt nor f2.txt exist
- D. An exception is always thrown
- E. File f1.txt exists while file f2.txt doesn't
Correct Answer: D 🗳️
Explanation: Only visible for ExamTorrent members. You can sign-up / login (it's free).
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