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

Exam Code: 1z1-830
Exam Name: Java SE 21 Developer Professional
Updated: Sep 16, 2026
Q & A: 85 Questions and Answers

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Oracle 1z1-830 Exam Syllabus Topics:

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

Oracle Java SE 21 Developer Professional Sample Questions:

Question #1

Given:
java
void verifyNotNull(Object input) {
boolean enabled = false;
assert enabled = true;
assert enabled;
System.out.println(input.toString());
assert input != null;
}
When does the given method throw a NullPointerException?

A. A NullPointerException is never thrown
B. Only if assertions are disabled and the input argument is null
C. Only if assertions are enabled and the input argument is null
D. Only if assertions are disabled and the input argument isn't null
E. Only if assertions are enabled and the input argument isn't null

Reveal Solution Discussion 0

Correct Answer: B 🗳️