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Last Updated: Sep 17, 2026
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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Modules and Packaging | - Manage dependencies and exports - Package and deploy applications - Create and use Java modules |
| Controlling Program Flow | - Use switch expressions and pattern matching - Work with records and sealed classes - Apply decision statements and loops |
| Java I/O and NIO | - Use Path, Files, and related APIs - Read and write files - Process file system resources |
| Collections and Generics | - Use List, Set, Map, Queue, and Deque implementations - Use sequenced collections and maps - Apply generics and bounded types |
| Object-Oriented Programming | - Apply inheritance and polymorphism - Implement encapsulation and abstraction - Create and use classes, interfaces, enums, and records |
| Annotations and JDBC | - Execute SQL operations and process results - Connect to databases using JDBC - Use built-in and custom annotations |
| Functional Programming | - Process data using Stream API - Use lambda expressions and method references - Work with functional interfaces |
| Exception Handling | - Use try-with-resources - Create custom exceptions - Handle checked and unchecked exceptions |
| Java Concurrency | - Work with concurrent collections and executors - Use virtual threads - Create and manage threads |
| 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 |
Oracle Java SE 21 Developer Professional Sample Questions:
Which two of the following aren't the correct ways to create a Stream?
- A. Stream stream = Stream.empty();
- B. Stream stream = Stream.of();
- C. Stream stream = Stream.ofNullable("a");
- D. Stream stream = new Stream();
- E. Stream<String> stream = Stream.builder().add("a").build();
- F. Stream stream = Stream.of("a");
- G. Stream stream = Stream.generate(() -> "a");
Correct Answer: D,E 🗳️
Explanation: Only visible for Test4Sure members. You can sign-up / login (it's free).
Given:
java
var frenchCities = new TreeSet<String>();
frenchCities.add("Paris");
frenchCities.add("Marseille");
frenchCities.add("Lyon");
frenchCities.add("Lille");
frenchCities.add("Toulouse");
System.out.println(frenchCities.headSet("Marseille"));
What will be printed?
- A. [Lyon, Lille, Toulouse]
- B. [Paris, Toulouse]
- C. [Lille, Lyon]
- D. Compilation fails
- E. [Paris]
Correct Answer: C 🗳️
Explanation: Only visible for Test4Sure members. You can sign-up / login (it's free).
Which of the following statements are correct?
- A. You can use 'protected' access modifier with all kinds of classes
- B. You can use 'final' modifier with all kinds of classes
- C. You can use 'private' access modifier with all kinds of classes
- D. You can use 'public' access modifier with all kinds of classes
- E. None
Correct Answer: E 🗳️
Explanation: Only visible for Test4Sure members. You can sign-up / login (it's free).
Given:
java
public class Versailles {
int mirrorsCount;
int gardensHectares;
void Versailles() { // n1
this.mirrorsCount = 17;
this.gardensHectares = 800;
System.out.println("Hall of Mirrors has " + mirrorsCount + " mirrors."); System.out.println("The gardens cover " + gardensHectares + " hectares.");
}
public static void main(String[] args) {
var castle = new Versailles(); // n2
}
}
What is printed?
- A. Compilation fails at line n1.
- B. nginx
Hall of Mirrors has 17 mirrors.
The gardens cover 800 hectares. - C. Compilation fails at line n2.
- D. Nothing
- E. An exception is thrown at runtime.
Correct Answer: A 🗳️
Explanation: Only visible for Test4Sure members. You can sign-up / login (it's free).
Given:
java
public static void main(String[] args) {
try {
throw new IOException();
} catch (IOException e) {
throw new RuntimeException();
} finally {
throw new ArithmeticException();
}
}
What is the output?
- A. ArithmeticException
- B. IOException
- C. Compilation fails
- D. RuntimeException
Correct Answer: A 🗳️
Explanation: Only visible for Test4Sure members. You can sign-up / login (it's free).
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