Oracle 1z1-830 : Java SE 21 Developer Professional

Exam Code: 1z1-830

Exam Name: Java SE 21 Developer Professional

Updated: Sep 17, 2026

Q & A: 85 Questions and Answers

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Oracle 1z1-830 Exam Syllabus Topics:

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

Oracle Java SE 21 Developer Professional Sample Questions:

Question #1

Given a properties file on the classpath named Person.properties with the content:
ini
name=James
And:
java
public class Person extends ListResourceBundle {
protected Object[][] getContents() {
return new Object[][]{
{"name", "Jeanne"}
};
}
}
And:
java
public class Test {
public static void main(String[] args) {
ResourceBundle bundle = ResourceBundle.getBundle("Person");
String name = bundle.getString("name");
System.out.println(name);
}
}
What is the given program's output?

A. Compilation fails
B. Jeanne
C. JeanneJames
D. JamesJeanne
E. MissingResourceException
F. James

Reveal Solution Discussion 0

Correct Answer: B 🗳️