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★ 43,965+ 1Z0-830 candidates assessed this year

Know exactly where you stand
before investing months in
1Z0-830 preparation.

20 exam-based questions across all 10 domains. Discover your strongest and weakest domains, identify where you'll gain points fastest, and get a personalised readiness report in 20 minutes.

91%
discovered a weakness they didn't know they had
+34%
average readiness improvement after following their plan
20 min
personalised readiness assessment
No credit card No Login required Results in 20 minutes Personalised report
12 1Z0-830 candidates took this test today  ·  Trusted by 43,965+ this year

What this test does

1
Diagnoses gaps - not just a score
20 scenario-based questions mirror real Java SE 21 Developer Professional difficulty. Every answer is analysed for speed, confidence, and domain accuracy.
2
Identifies the domains with the biggest impact on your score
Most Java SE 21 Developer Professional failures come from just 1–2 weak domains. This test finds yours - by name - so you know exactly where to focus.
3
Gives you a pass-ready date and daily plan
Your report includes a predicted date you'll cross the 90% readiness threshold and a day-by-day study schedule built around your gaps.

1Z0-830 domains covered in this test

Handling Date, Time, Text, Numeric and Boolean Values
5
10 of exam
Controlling Program Flow
5
10 of exam
Using Object-Oriented Concepts in Java
5
10 of exam
Handling Exceptions
5
10 of exam
Working with Arrays and Collections
5
10 of exam
Working with Streams and Lambda Expressions
5
10 of exam
Packaging and Deploying Java Code
5
10 of exam
Managing Concurrent Code Execution
5
10 of exam
Using Java I/O API
5
10 of exam
Implementing Localization
5
10 of exam

Stop guessing.
Know your 1Z0-830 gaps before exam day.

Free, instant, no login. Takes 20 minutes. Your report shows exactly what to fix - by domain.

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Frequently asked questions

How hard is the Java SE 21 Developer Professional exam? +
1Z0-830 is a hard exam even for experienced Java developers. It asks you to act as the compiler: will this code compile, and what does it print? Without an IDE, subtle issues in generics, scoping, switch exhaustiveness and pattern matching are easy to miss. It also covers a wide range, from language basics to concurrency, streams, I/O, modules and localization.
What is the 1Z0-830 exam format? +
The exam has 50 multiple-choice questions with a 120-minute time limit. Many questions include long code samples that require scrolling, so reading time adds up. It is available through Oracle's online proctoring or at a test center. There is a single exam for this certification, unlike some older Java credentials that required two.
What is the passing score for 1Z0-830? +
The passing score is 68%, which means about 34 of 50 questions correct. Because the exam spans so many topics, weak spots in one or two areas can push you below the line quickly. Check Oracle's exam page before booking, as Oracle can change exam details.
How much does 1Z0-830 cost and are there prerequisites? +
The exam costs about $245 in the US, with pricing varying by country. There are no formal prerequisites. If you fail, Oracle requires a wait before you can retake the same exam, and you pay again. Some Oracle learning subscriptions include exam attempts, so check what you already have access to.
What Java 21 features are on the exam? +
Expect records, sealed classes and interfaces, pattern matching for instanceof and switch, record patterns, text blocks, enhanced switch expressions, and virtual threads alongside the concurrency API. These appear in detailed, compiler-level questions. Developers who use Java 8 or 11 at work need extra time with these features.
Should I take 1Z0-830 or the Java SE 17 exam? +
If you are starting fresh, Java SE 21 is the current long-term support release and the more relevant choice. The Java SE 17 exam (1Z0-829) covers much of the same foundation but not the newer Java 21 features. Choose 17 only if your employer specifically requires it.