Oracle 1z0-830 Exam Questions : Java SE 21 Developer Professional

Exam Code: 1z0-830
Exam Name: Java SE 21 Developer Professional
Updated: Sep 18, 2026
Q&As: 85 Questions and Answers

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Oracle 1z0-830 Exam Syllabus Topics:

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

Oracle Java SE 21 Developer Professional Sample Questions:

Question #1

Given:
java
interface SmartPhone {
boolean ring();
}
class Iphone15 implements SmartPhone {
boolean isRinging;
boolean ring() {
isRinging = !isRinging;
return isRinging;
}
}
Choose the right statement.

A. Iphone15 class does not compile
B. An exception is thrown at running Iphone15.ring();
C. Everything compiles
D. SmartPhone interface does not compile

Reveal Solution Discussion 0

Correct Answer: A 🗳️