Exam Code: 1z1-830
Exam Name: Java SE 21 Developer Professional
Certification Provider: Oracle
Corresponding Certification: Java SE

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Updated: Sep 10, 2026

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Oracle 1z1-830 Exam Syllabus Topics:

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

Oracle Java SE 21 Developer Professional Sample Questions:

Question #1

Given:
java
var frenchCities = new TreeSet<String>();
frenchCities.add("Paris");
frenchCities.add("Marseille");
frenchCities.add("Lyon");
frenchCities.add("Lille");
frenchCities.add("Toulouse");
System.out.println(frenchCities.headSet("Marseille"));
What will be printed?

A. Compilation fails
B. [Lille, Lyon]
C. [Paris]
D. [Paris, Toulouse]
E. [Lyon, Lille, Toulouse]

Reveal Solution Discussion 0

Correct Answer: B 🗳️