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Last Updated: Nov 14, 2026
No. of Questions: 85 Questions & Answers with Testing Engine
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Oracle 1z1-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Advanced Java Features (Java SE 21) | - Modern language features
|
| Topic 2: Object-Oriented Programming | - Core OOP principles
|
| Topic 3: Input/Output and File Handling | - NIO and file operations
|
| Topic 4: Concurrency and Multithreading | - Thread management
|
| Topic 5: Database Connectivity (JDBC) | - Database interaction
|
| Topic 6: Core APIs | - Java standard library usage
|
| Topic 7: Exception Handling and Debugging | - Error handling mechanisms
|
| Topic 8: Java Language Fundamentals | - Java syntax and language structure
|
Oracle Java SE 21 Developer Professional Sample Questions:
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 bam followed by an exception
- B. bim boom
- C. bim bam boom
- D. Compilation fails.
- E. bim boom bam
Correct Answer: C 🗳️
Explanation: Only visible for Pass4SureQuiz members. You can sign-up / login (it's free).
Which methods compile?
- A. ```java
public List<? super IOException> getListSuper() {
return new ArrayList<FileNotFoundException>();
} - B. ```java public List<? extends IOException> getListExtends() { return new ArrayList<Exception>(); } csharp
- C. ```java public List<? super IOException> getListSuper() { return new ArrayList<Exception>(); } csharp
- D. ```java
public List<? extends IOException> getListExtends() {
return new ArrayList<FileNotFoundException>();
}
Correct Answer: C,D 🗳️
Explanation: Only visible for Pass4SureQuiz members. You can sign-up / login (it's free).
Consider the following methods to load an implementation of MyService using ServiceLoader. Which of the methods are correct? (Choose all that apply)
- A. MyService service = ServiceLoader.services(MyService.class).getFirstInstance();
- B. MyService service = ServiceLoader.load(MyService.class).iterator().next();
- C. MyService service = ServiceLoader.load(MyService.class).findFirst().get();
- D. MyService service = ServiceLoader.getService(MyService.class);
Correct Answer: B,C 🗳️
Explanation: Only visible for Pass4SureQuiz members. You can sign-up / login (it's free).
Which of the following statements are correct?
- A. You can use 'private' access modifier with all kinds of classes
- B. None
- C. You can use 'protected' access modifier with all kinds of classes
- D. You can use 'public' access modifier with all kinds of classes
- E. You can use 'final' modifier with all kinds of classes
Correct Answer: B 🗳️
Explanation: Only visible for Pass4SureQuiz members. You can sign-up / login (it's free).
Given:
java
List<Long> cannesFestivalfeatureFilms = LongStream.range(1, 1945)
.boxed()
.toList();
try (var executor = Executors.newVirtualThreadPerTaskExecutor()) {
cannesFestivalfeatureFilms.stream()
.limit(25)
.forEach(film -> executor.submit(() -> {
System.out.println(film);
}));
}
What is printed?
- A. Numbers from 1 to 25 sequentially
- B. Numbers from 1 to 25 randomly
- C. Compilation fails
- D. Numbers from 1 to 1945 randomly
- E. An exception is thrown at runtime
Correct Answer: B 🗳️
Explanation: Only visible for Pass4SureQuiz members. You can sign-up / login (it's free).
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