Exam Code: 1z0-830
Exam Name: Java SE 21 Developer Professional
Certification Provider: Oracle
Corresponding Certification: Java SE

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Updated: Oct 13, 2026

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Oracle 1z0-830 Exam Overview:

Certification Vendor:	Oracle
Exam Name:	Java SE 21 Developer Professional
Exam Number:	1Z0-830
Exam Format:	Multiple Choice, Multiple Select
Exam Price:	$300 USD
Certificate Validity Period:	18 months
Exam Duration:	120 minutes
Real Exam Qty:	50
Related Certifications:	Oracle Certified Professional: Java SE 17 Developer Oracle Certified Professional: Java SE 11 Developer
Available Languages:	Japanese, Chinese (Simplified), English
Passing Score:	68%
Recommended Training:	Oracle Java SE 21 Developer Training
Exam Registration:	Oracle University Registration Pearson VUE
Sample Questions:	Oracle 1z0-830 Sample Questions
Exam Way:	Online proctored or onsite at Pearson VUE test centers
Pre Condition:	No mandatory prerequisites; recommended 2+ years of Java development experience or equivalent knowledge
Official Syllabus URL:	https://education.oracle.com/java-se-21-developer/pexam_1Z0-830

Oracle 1z0-830 Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Concurrency and Multithreading	10%	- Thread lifecycle, Runnable, Callable, ExecutorService, virtual threads - Synchronization, locks, concurrent collections, thread safety
Topic 2: Controlling Program Flow	10%	- Decision constructs: if-else, switch expressions and statements, pattern matching - Loops: for, enhanced for, while, do-while, break, continue, return
Topic 3: Advanced Features and Annotations	3%	- Generics, type parameters, wildcards, type erasure - Annotations, built-in annotations, custom annotations
Topic 4: Java I/O and Localization	5%	- File I/O, NIO.2, streams, readers/writers, serialization - Resource bundles, locale, formatting messages, numbers, dates
Topic 5: Functional Programming and Streams	15%	- Stream API: create, intermediate/terminal operations, parallel streams, grouping, partitioning - Lambda expressions, functional interfaces, method references - Optional class, primitive streams
Topic 6: Handling Date, Time, Text, Numeric and Boolean Values	12%	- Use primitives and wrapper classes, evaluate expressions and apply type conversions - Manipulate text, text blocks, String, StringBuilder and StringBuffer - Use Date-Time API: LocalDate, LocalTime, LocalDateTime, Period, Duration, Instant, ZonedDateTime
Topic 7: Modules and Packaging	5%	- Create and use JAR files, modular and non-modular builds - Module system: module-info.java, exports, requires, provides, uses
Topic 8: Handling Exceptions	8%	- Exception hierarchy, try-catch-finally, multi-catch, try-with-resources - Create and use custom exceptions, throw, throws
Topic 9: Working with Arrays and Collections	12%	- Collections Framework: List, Set, Map, Deque, Queue, sorting, searching - Declare, instantiate, initialize, use arrays and multidimensional arrays
Topic 10: Using Object-Oriented Concepts	20%	- Enums, nested classes, local variable type inference - Overloading, overriding, Object class methods, immutable objects - Inheritance, abstract classes, sealed classes, interfaces, polymorphism - Classes, records, objects, constructors, initializers, methods, fields, encapsulation

Oracle Java SE 21 Developer Professional Sample Questions:

Question #1

Given:
java
public class Test {
class A {
}
static class B {
}
public static void main(String[] args) {
// Insert here
}
}
Which three of the following are valid statements when inserted into the given program?

A. A a = new Test().new A();
B. A a = new A();
C. B b = new Test().new B();
D. B b = new B();
E. A a = new Test.A();
F. B b = new Test.B();

Reveal Solution Discussion 0

Correct Answer: A,D,F 🗳️