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Oracle 1z0-830 Exam Questions : Java SE 21 Developer Professional
- Exam Code: 1z0-830
- Exam Name: Java SE 21 Developer Professional
- Updated: Sep 10, 2026
- Q&As: 85 Questions and Answers
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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Object-Oriented Programming | - Core OOP principles
|
| Core APIs | - Java standard library usage
|
| Input/Output and File Handling | - NIO and file operations
|
| Exception Handling and Debugging | - Error handling mechanisms
|
| Advanced Java Features (Java SE 21) | - Modern language features
|
| Concurrency and Multithreading | - Thread management
|
| Database Connectivity (JDBC) | - Database interaction
|
| Java Language Fundamentals | - Java syntax and language structure
|
Oracle Java SE 21 Developer Professional Sample Questions:
Question #1
You are working on a module named perfumery.shop that depends on another module named perfumery.
provider.
The perfumery.shop module should also make its package perfumery.shop.eaudeparfum available to other modules.
Which of the following is the correct file to declare the perfumery.shop module?
- A. File name: module.java
java
module shop.perfumery {
requires perfumery.provider;
exports perfumery.shop.eaudeparfum;
} - B. File name: module-info.perfumery.shop.java
java
module perfumery.shop {
requires perfumery.provider;
exports perfumery.shop.eaudeparfum.*;
} - C. File name: module-info.java
java
module perfumery.shop {
requires perfumery.provider;
exports perfumery.shop.eaudeparfum;
}
Answer: C
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Question #2
Which two of the following aren't the correct ways to create a Stream?
- A. Stream stream = Stream.of("a");
- B. Stream<String> stream = Stream.builder().add("a").build();
- C. Stream stream = new Stream();
- D. Stream stream = Stream.generate(() -> "a");
- E. Stream stream = Stream.of();
- F. Stream stream = Stream.empty();
- G. Stream stream = Stream.ofNullable("a");
Answer: B,C
Explanation: Only visible for VCEPrep members. You can sign-up / login (it's free).
Question #3
Given:
java
Runnable task1 = () -> System.out.println("Executing Task-1");
Callable<String> task2 = () -> {
System.out.println("Executing Task-2");
return "Task-2 Finish.";
};
ExecutorService execService = Executors.newCachedThreadPool();
// INSERT CODE HERE
execService.awaitTermination(3, TimeUnit.SECONDS);
execService.shutdownNow();
Which of the following statements, inserted in the code above, printsboth:
"Executing Task-2" and "Executing Task-1"?
- A. execService.call(task1);
- B. execService.submit(task2);
- C. execService.execute(task2);
- D. execService.submit(task1);
- E. execService.run(task2);
- F. execService.run(task1);
- G. execService.call(task2);
- H. execService.execute(task1);
Answer: B,D
Explanation: Only visible for VCEPrep members. You can sign-up / login (it's free).
Question #4
Which StringBuilder variable fails to compile?
java
public class StringBuilderInstantiations {
public static void main(String[] args) {
var stringBuilder1 = new StringBuilder();
var stringBuilder2 = new StringBuilder(10);
var stringBuilder3 = new StringBuilder("Java");
var stringBuilder4 = new StringBuilder(new char[]{'J', 'a', 'v', 'a'});
}
}
- A. None of them
- B. stringBuilder2
- C. stringBuilder4
- D. stringBuilder3
- E. stringBuilder1
Answer: C
Explanation: Only visible for VCEPrep members. You can sign-up / login (it's free).
Question #5
Given:
java
Deque<Integer> deque = new ArrayDeque<>();
deque.offer(1);
deque.offer(2);
var i1 = deque.peek();
var i2 = deque.poll();
var i3 = deque.peek();
System.out.println(i1 + " " + i2 + " " + i3);
What is the output of the given code fragment?
- A. 2 2 1
- B. 2 1 1
- C. 2 1 2
- D. An exception is thrown.
- E. 2 2 2
- F. 1 2 2
- G. 1 1 1
- H. 1 1 2
- I. 1 2 1
Answer: F
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