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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Input/Output and File Handling | - NIO and file operations
|
| Object-Oriented Programming | - Core OOP principles
|
| Concurrency and Multithreading | - Thread management
|
| Java Language Fundamentals | - Java syntax and language structure
|
| Core APIs | - Java standard library usage
|
| Exception Handling and Debugging | - Error handling mechanisms
|
| Advanced Java Features (Java SE 21) | - Modern language features
|
| Database Connectivity (JDBC) | - Database interaction
|
Oracle Java SE 21 Developer Professional Sample Questions:
Which three of the following are correct about the Java module system?
- A. If a request is made to load a type whose package is not defined in any known module, then the module system will attempt to load it from the classpath.
- B. The unnamed module exports all of its packages.
- C. If a package is defined in both a named module and the unnamed module, then the package in the unnamed module is ignored.
- D. Code in an explicitly named module can access types in the unnamed module.
- E. The unnamed module can only access packages defined in the unnamed module.
- F. We must add a module descriptor to make an application developed using a Java version prior to SE9 run on Java 11.
Correct Answer: A,B,C 🗳️
Explanation: Only visible for RealVCE 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 1945 randomly
- B. Numbers from 1 to 25 randomly
- C. An exception is thrown at runtime
- D. Numbers from 1 to 25 sequentially
- E. Compilation fails
Correct Answer: B 🗳️
Explanation: Only visible for RealVCE members. You can sign-up / login (it's free).
What is the output of the following snippet? (Assume the file exists)
java
Path path = Paths.get("C:\\home\\joe\\foo");
System.out.println(path.getName(0));
- A. C
- B. IllegalArgumentException
- C. home
- D. C:
- E. Compilation error
Correct Answer: C 🗳️
Explanation: Only visible for RealVCE members. You can sign-up / login (it's free).
Given:
java
ExecutorService service = Executors.newFixedThreadPool(2);
Runnable task = () -> System.out.println("Task is complete");
service.submit(task);
service.shutdown();
service.submit(task);
What happens when executing the given code fragment?
- A. It prints "Task is complete" twice, then exits normally.
- B. It prints "Task is complete" twice and throws an exception.
- C. It prints "Task is complete" once, then exits normally.
- D. It prints "Task is complete" once and throws an exception.
- E. It exits normally without printing anything to the console.
Correct Answer: D 🗳️
Explanation: Only visible for RealVCE members. You can sign-up / login (it's free).
Given:
java
package vehicule.parent;
public class Car {
protected String brand = "Peugeot";
}
and
java
package vehicule.child;
import vehicule.parent.Car;
public class MiniVan extends Car {
public static void main(String[] args) {
Car car = new Car();
car.brand = "Peugeot 807";
System.out.println(car.brand);
}
}
What is printed?
- A. An exception is thrown at runtime.
- B. Peugeot 807
- C. Compilation fails.
- D. Peugeot
Correct Answer: C 🗳️
Explanation: Only visible for RealVCE members. You can sign-up / login (it's free).
Alfred 
Timothy 
Audrey 
Clifford 
Algernon 
Kent 
Channing 
Hiram 
Fitzgerald 
Colby 
Judith 
Griffith 
Michaelia 
Marsh 
Lewis 
Ralap 
Kama 
Evan 
