Oracle 1z1-830 Exam : Java SE 21 Developer Professional

Exam Code: 1z1-830
Exam Name: Java SE 21 Developer Professional
Updated: Oct 02, 2026
Q & A: 85 Questions and Answers

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Oracle 1z1-830 Exam Syllabus Topics:

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

Oracle Java SE 21 Developer Professional Sample Questions:

Question #1

Given:
java
public class BoomBoom implements AutoCloseable {
public static void main(String[] args) {
try (BoomBoom boomBoom = new BoomBoom()) {
System.out.print("bim ");
throw new Exception();
} catch (Exception e) {
System.out.print("boom ");
}
}
@Override
public void close() throws Exception {
System.out.print("bam ");
throw new RuntimeException();
}
}
What is printed?

A. bim boom bam
B. bim bam boom
C. bim boom
D. Compilation fails.
E. bim bam followed by an exception

Reveal Solution Discussion 0

Correct Answer: B 🗳️