Oracle 1z1-830 : Java SE 21 Developer Professional

Exam Code: 1z1-830
Exam Name: Java SE 21 Developer Professional
Updated: Oct 06, 2026
Q & A: 85 Questions and Answers

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Oracle 1z1-830 Exam Syllabus Topics:

Section	Objectives
Topic 1: Exception Handling and Debugging	- Error handling mechanisms 1. Checked vs unchecked exceptions 2. Try-with-resources
Topic 2: Advanced Java Features (Java SE 21)	- Modern language features 1. Sealed classes 2. Records and record patterns 3. Pattern matching for switch 4. Virtual threads (Project Loom)
Topic 3: Java Language Fundamentals	- Java syntax and language structure 1. Control flow statements 2. Data types, variables, and operators
Topic 4: Concurrency and Multithreading	- Thread management 1. Virtual threads and structured concurrency concepts 2. Thread lifecycle and synchronization
Topic 5: Core APIs	- Java standard library usage 1. Collections Framework 2. Streams and functional programming 3. Date and Time API
Topic 6: Database Connectivity (JDBC)	- Database interaction 1. SQL execution and result handling 2. JDBC API usage
Topic 7: Input/Output and File Handling	- NIO and file operations 1. Serialization basics 2. File, Path, and Streams APIs
Topic 8: Object-Oriented Programming	- Core OOP principles 1. Abstract classes and interfaces 2. Encapsulation, inheritance, polymorphism

Oracle Java SE 21 Developer Professional Sample Questions:

Question #1

Given:
java
sealed class Vehicle permits Car, Bike {
}
non-sealed class Car extends Vehicle {
}
final class Bike extends Vehicle {
}
public class SealedClassTest {
public static void main(String[] args) {
Class<?> vehicleClass = Vehicle.class;
Class<?> carClass = Car.class;
Class<?> bikeClass = Bike.class;
System.out.print("Is Vehicle sealed? " + vehicleClass.isSealed() +
"; Is Car sealed? " + carClass.isSealed() +
"; Is Bike sealed? " + bikeClass.isSealed());
}
}
What is printed?

A. Is Vehicle sealed? true; Is Car sealed? false; Is Bike sealed? false
B. Is Vehicle sealed? false; Is Car sealed? true; Is Bike sealed? true
C. Is Vehicle sealed? true; Is Car sealed? true; Is Bike sealed? true
D. Is Vehicle sealed? false; Is Car sealed? false; Is Bike sealed? false

Reveal Solution Discussion 0

Correct Answer: A 🗳️