How many 1Z0-830 practice questions are there?

254 questions across 1 version, each with the correct answer and an explanation.

Are there free 1Z0-830 sample questions?

Yes. 17 sample questions are free; 8 are open to everyone and the rest unlock with a free account.

What does full access include?

Every 1Z0-830 question in study, timed and flashcard modes, explanations for each answer, and progress that saves so you can resume.

What topics does 1Z0-830 cover?

Handling Date, Time, Text, Numeric and Boolean Values (12%), Controlling Program Flow (10%), Using Object-Oriented Concepts in Java (25%), Handling Exceptions (8%), Working with Arrays and Collections (10%), Working with Streams and Lambda Expressions (15%), Packaging and Deploying Java Code (8%), Managing Concurrent Code Execution (12%), Using Java I/O API (8%), Implementing Localization (7%).

How much does the 1Z0-830 exam cost?

The 1Z0-830 exam fee is $245 (USD; local pricing varies by region and provider).

How long is the 1Z0-830 certification valid?

Does not expire. Recertification: Oracle certifications do not expire; New version certifications available as Java evolves.

1Z0-830Java SE 21 Developer Professional practice test

254 Oracle 1Z0-830 practice questions with explanations, in study, timed and flashcard modes. 17 samples are free.

Full access

All 254 questions with explanations · Study, timed and flashcard modes · Progress saved, resume any time

Try the free samples first

Questions: 254
Free samples: 17
Versions: 1
Updated: Jan 2026

Practice 1Z0-830 in the simulator.

Study, timed and flashcard modes. Answers and explanations as you go, and your progress saves.

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1Z0-830, by the numbers.

Official specifications published by Oracle.

Duration: 120 min
Questions: 50
Passing score: 68%
Exam fee: $245
In the bank: v1 (254)

Open the full exam guide

Everything about 1Z0-830.

1Z0-830 · Oracle · Java 21

Exam information

Official specifications published by Oracle, plus what is in our question bank.

Duration: 120 min
Questions: 50
Passing score: 68%
Level: Professional
Question types: Multiple Choice

Three ways to practise

Study mode

Work through the bank at your own pace with the answer and explanation one tap away. Flag questions, add notes, bookmark the hard ones.

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Timed mode

A shuffled deck with a countdown that mirrors the real exam. Your score is saved to your attempt history.

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Flashcards

Question on the front, answer on the back. Good for the last week before the exam.

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1Z0-830Java SE 21 Developer Professional practice test

Full access

Practice 1Z0-830 in the simulator.

1Z0-830, by the numbers.