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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Advanced Java Features (Java SE 21) | - Modern language features
|
| Java Language Fundamentals | - Java syntax and language structure
|
| Database Connectivity (JDBC) | - Database interaction
|
| Object-Oriented Programming | - Core OOP principles
|
| Core APIs | - Java standard library usage
|
| Exception Handling and Debugging | - Error handling mechanisms
|
| Concurrency and Multithreading | - Thread management
|
| Input/Output and File Handling | - NIO and file operations
|
Oracle Java SE 21 Developer Professional Sample Questions:
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-info.java
java
module perfumery.shop {
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.java
java
module shop.perfumery {
requires perfumery.provider;
exports perfumery.shop.eaudeparfum;
}
Correct Answer: A 🗳️
Explanation: Only visible for DumpsMaterials 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. Peugeot 807
- B. An exception is thrown at runtime.
- C. Compilation fails.
- D. Peugeot
Correct Answer: C 🗳️
Explanation: Only visible for DumpsMaterials members. You can sign-up / login (it's free).
Which three of the following are correct about the Java module system?
- A. The unnamed module can only access packages defined in the unnamed module.
- B. 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.
- 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. We must add a module descriptor to make an application developed using a Java version prior to SE9 run on Java 11.
- E. Code in an explicitly named module can access types in the unnamed module.
- F. The unnamed module exports all of its packages.
Correct Answer: B,C,F 🗳️
Explanation: Only visible for DumpsMaterials members. You can sign-up / login (it's free).
What do the following print?
java
import java.time.Duration;
public class DividedDuration {
public static void main(String[] args) {
var day = Duration.ofDays(2);
System.out.print(day.dividedBy(8));
}
}
- A. PT0H
- B. PT0D
- C. PT6H
- D. It throws an exception
- E. Compilation fails
Correct Answer: C 🗳️
Explanation: Only visible for DumpsMaterials members. You can sign-up / login (it's free).
Given:
java
System.out.print(Boolean.logicalAnd(1 == 1, 2 < 1));
System.out.print(Boolean.logicalOr(1 == 1, 2 < 1));
System.out.print(Boolean.logicalXor(1 == 1, 2 < 1));
What is printed?
- A. truefalsetrue
- B. truetruetrue
- C. truetruefalse
- D. falsetruetrue
- E. Compilation fails
Correct Answer: A 🗳️
Explanation: Only visible for DumpsMaterials members. You can sign-up / login (it's free).
Viewing page 1 out of 17 pages.
Viewing questions 1-5 out of 85 questions.
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