OCP Java SE 21

Exam code 1Z0-830 · Updated Jul 2026

Practice questions for the Oracle Certified Professional, Java SE 21 Developer (1Z0-830) exam. Covers modern Java through Java 21 — records, sealed classes, pattern matching for switch and records, virtual threads, sequenced collections, the module system, streams, and concurrency.

Topics covered · 18

Advanced Class Design & Design PatternsConcurrencyWorking with Java Data TypesDate/Time API (JSR-310)Handling ExceptionsText BlocksLocalizationGenerics and CollectionsStream APILambda Expressions and Functional InterfacesSwitch Expressions & StatementsPattern Matching (instanceof, switch, record patterns)RecordsSealed Classes & InterfacesJava I/O and NIO.2Java Platform Module System (JPMS)Sequenced CollectionsVirtual Threads & Structured Concurrency
TestHoop Originals

What's included

Full mock exams
3 exams
Topic drills
18 drills
Total questions
331 across all mocks

Full mock exams

Full Practice Exam 1
120 min · 50 questions
covers: Advanced Class Design & Design Patterns, Working with Java Data Types, Text Blocks +15 more
Not started
Full Practice Exam 2
120 min · 50 questions
covers: Text Blocks, Working with Java Data Types, Lambda Expressions and Functional Interfaces +15 more
Not started
Full Practice Exam 3
120 min · 50 questions
covers: Records, Concurrency, Generics and Collections +15 more
Not started

Topic drills

Class Design
20 min · 11 questions
covers: Advanced Class Design & Design Patterns
Not started
Concurrency
18 min · 10 questions
covers: Concurrency
Not started
Data Types
20 min · 11 questions
covers: Working with Java Data Types
Not started
Date-Time API
16 min · 9 questions
covers: Date/Time API (JSR-310)
Not started
Exceptions
18 min · 10 questions
covers: Handling Exceptions
Not started
Generics & Collections
18 min · 10 questions
covers: Generics and Collections
Not started
I/O & NIO.2
16 min · 9 questions
covers: Java I/O and NIO.2
Not started
Lambdas & Functional Interfaces
16 min · 9 questions
covers: Lambda Expressions and Functional Interfaces
Not started
Localization
16 min · 9 questions
covers: Localization
Not started
The Module System
16 min · 9 questions
covers: Java Platform Module System (JPMS)
Not started
Pattern Matching
29 min · 16 questions
covers: Pattern Matching (instanceof, switch, record patterns)
Not started
Records
18 min · 10 questions
covers: Records
Not started
Sealed Classes
16 min · 9 questions
covers: Sealed Classes & Interfaces
Not started
Sequenced Collections
18 min · 10 questions
covers: Sequenced Collections
Not started
Streams
18 min · 10 questions
covers: Stream API
Not started
Switch Expressions
18 min · 10 questions
covers: Switch Expressions & Statements
Not started
Text Blocks
16 min · 9 questions
covers: Text Blocks
Not started
Virtual Threads
18 min · 10 questions
covers: Virtual Threads & Structured Concurrency
Not started

Ratings

Sign in to rate this pack.

About OCP Java SE 21

OCP Java SE 21 (1Z0-830) is a practice-exam pack for the Oracle Java certification track. It contains 21 timed mock exams — 331 practice questions, totalling 11 hours 25 minutes of exam time — each with a worked explanation, not just an answer key. Topics covered include Advanced Class Design & Design Patterns, Concurrency, Working with Java Data Types, Date/Time API (JSR-310), Handling Exceptions, Text Blocks, Localization, Generics and Collections, Stream API, Lambda Expressions and Functional Interfaces, Switch Expressions & Statements and Pattern Matching (instanceof, switch, record patterns). Questions target the current Java exam objectives at an advanced level. Practice questions for the Oracle Certified Professional, Java SE 21 Developer (1Z0-830) exam. Covers modern Java through Java 21 — records, sealed classes, pattern matching for switch and records, virtual threads, sequenced collections, the module system, streams, and concurrency.

Topics covered

  • Advanced Class Design & Design Patterns
  • Concurrency
  • Working with Java Data Types
  • Date/Time API (JSR-310)
  • Handling Exceptions
  • Text Blocks
  • Localization
  • Generics and Collections
  • Stream API
  • Lambda Expressions and Functional Interfaces
  • Switch Expressions & Statements
  • Pattern Matching (instanceof, switch, record patterns)

Practice by topic

Each topic has its own page of worked questions — the prompt, every option, why each is right or wrong, and the explanation.

At a glance

Exam code
1Z0-830
Vendor
Oracle
Track
Java
Difficulty
Advanced
Practice questions
331
Mock exams
21
Total exam time
11 hours 25 minutes
Topics covered
Advanced Class Design & Design Patterns, Concurrency, Working with Java Data Types, Date/Time API (JSR-310), Handling Exceptions, Text Blocks, Localization, Generics and Collections, Stream API, Lambda Expressions and Functional Interfaces, Switch Expressions & Statements, Pattern Matching (instanceof, switch, record patterns)
Author
TestHoop Originals

Frequently asked questions

How many practice questions does OCP Java SE 21 include?

OCP Java SE 21 includes 331 practice questions across 21 timed mock exams, each with a detailed explanation.

How long are the Oracle Java mock exams?

This pack contains 11 hours 25 minutes of timed practice across 21 mock exams, mirroring real exam conditions.

What topics does OCP Java SE 21 cover?

OCP Java SE 21 covers Advanced Class Design & Design Patterns, Concurrency, Working with Java Data Types, Date/Time API (JSR-310), Handling Exceptions, Text Blocks, Localization, Generics and Collections, Stream API, Lambda Expressions and Functional Interfaces, Switch Expressions & Statements and Pattern Matching (instanceof, switch, record patterns) — the areas the Oracle Java exam objectives examine.

How hard is the 1Z0-830 exam?

OCP Java SE 21 is pitched at an advanced level and tracks the current Oracle Java objectives.

Can I try OCP Java SE 21 for free?

You can practise questions from this pack without an account. Timed mock exams and saved progress need a free sign-in.