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Oracle 1z1-830 Value Package

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Exam Code: 1z1-830
Exam Name: Java SE 21 Developer Professional
No. of Questions: 85 Questions and Answers
Updated: Oct 04, 2026

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Oracle 1z1-830 Exam Syllabus Topics:

Section	Objectives
Topic 1: Exception Handling	- Use try-with-resources - Handle checked and unchecked exceptions - Create custom exceptions
Topic 2: Modules and Packaging	- Package and deploy applications - Create and use Java modules - Manage dependencies and exports
Topic 3: Handling Date, Time, Text, Numeric and Boolean Values	- Work with primitive wrappers and number formatting - Use date, time, duration, period, and localization APIs - Use String, StringBuilder, and related APIs
Topic 4: Annotations and JDBC	- Connect to databases using JDBC - Execute SQL operations and process results - Use built-in and custom annotations
Topic 5: Functional Programming	- Use lambda expressions and method references - Work with functional interfaces - Process data using Stream API
Topic 6: Java I/O and NIO	- Process file system resources - Use Path, Files, and related APIs - Read and write files
Topic 7: Controlling Program Flow	- Work with records and sealed classes - Apply decision statements and loops - Use switch expressions and pattern matching
Topic 8: Java Concurrency	- Use virtual threads - Work with concurrent collections and executors - Create and manage threads
Topic 9: Object-Oriented Programming	- Apply inheritance and polymorphism - Implement encapsulation and abstraction - Create and use classes, interfaces, enums, and records
Topic 10: Collections and Generics	- Use List, Set, Map, Queue, and Deque implementations - Apply generics and bounded types - Use sequenced collections and maps

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

Reveal Solution Discussion 0

Correct Answer: B 🗳️