Java SE 21 Developer Professional: 1z1-830 Exam

"Java SE 21 Developer Professional", also known as 1z1-830 exam, is a Oracle Certification. With the complete collection of questions and answers, PrepPDF has assembled to take you through 85 Q&As to your 1z1-830 Exam preparation. In the 1z1-830 exam resources, you will cover every field and category in Java SE Certification helping to ready you for your successful Oracle Certification.

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Exam Code: 1z1-830
Exam Name: Java SE 21 Developer Professional
Certification Provider: Oracle
Corresponding Certification: Java SE
Updated: Oct 08, 2026
No. of Questions: 85 Questions & Answers with Testing Engine
Download Limit: Unlimited

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Oracle 1z1-830 Exam Syllabus Topics:

Section	Weight	Objectives
Controlling Program Flow	10%	- Loops: for, enhanced for, while, do-while, break, continue, return - Decision constructs: if-else, switch expressions and statements, pattern matching
Concurrency and Multithreading	10%	- Thread lifecycle, Runnable, Callable, ExecutorService, virtual threads - Synchronization, locks, concurrent collections, thread safety
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
Advanced Features and Annotations	3%	- Generics, type parameters, wildcards, type erasure - Annotations, built-in annotations, custom annotations
Working with Arrays and Collections	12%	- Declare, instantiate, initialize, use arrays and multidimensional arrays - Collections Framework: List, Set, Map, Deque, Queue, sorting, searching
Modules and Packaging	5%	- Create and use JAR files, modular and non-modular builds - Module system: module-info.java, exports, requires, provides, uses
Handling Exceptions	8%	- Exception hierarchy, try-catch-finally, multi-catch, try-with-resources - Create and use custom exceptions, throw, throws
Using Object-Oriented Concepts	20%	- Inheritance, abstract classes, sealed classes, interfaces, polymorphism - Classes, records, objects, constructors, initializers, methods, fields, encapsulation - Enums, nested classes, local variable type inference - Overloading, overriding, Object class methods, immutable objects
Java I/O and Localization	5%	- File I/O, NIO.2, streams, readers/writers, serialization - Resource bundles, locale, formatting messages, numbers, dates
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

Oracle Java SE 21 Developer Professional Sample Questions:

Question #1

What do the following print?
java
import java.time.Duration;
public class DividedDuration {
public static void main(String[] args) {
var day = Duration.ofDays(2);
System.out.print(day.dividedBy(8));
}
}

A. PT0D
B. PT6H
C. It throws an exception
D. PT0H
E. Compilation fails

Reveal Solution Discussion 0

Correct Answer: B 🗳️