Oracle 1z1-830 : Java SE 21 Developer Professional

Exam Code: 1z1-830
Exam Name: Java SE 21 Developer Professional
Updated: Oct 01, 2026
Q & A: 85 Questions and Answers

About Oracle 1z1-830 Exam

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Oracle 1z1-830 Exam Syllabus Topics:

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

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

Reveal Solution Discussion 0

Correct Answer: C 🗳️