Java SE 21 Developer Professional: 1z1-830 Exam Premium File as PDF & Test Engine
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Last Updated: Oct 03, 2026
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Oracle 1z1-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Database Connectivity (JDBC) | - Database interaction
|
| Topic 2: Advanced Java Features (Java SE 21) | - Modern language features
|
| Topic 3: Object-Oriented Programming | - Core OOP principles
|
| Topic 4: Concurrency and Multithreading | - Thread management
|
| Topic 5: Java Language Fundamentals | - Java syntax and language structure
|
| Topic 6: Core APIs | - Java standard library usage
|
| Topic 7: Input/Output and File Handling | - NIO and file operations
|
| Topic 8: Exception Handling and Debugging | - Error handling mechanisms
|
Oracle Java SE 21 Developer Professional Sample Questions:
Which methods compile?
- A. ```java public List<? super IOException> getListSuper() { return new ArrayList<Exception>(); } csharp
- B. ```java
public List<? super IOException> getListSuper() {
return new ArrayList<FileNotFoundException>();
} - C. ```java public List<? extends IOException> getListExtends() { return new ArrayList<Exception>(); } csharp
- D. ```java
public List<? extends IOException> getListExtends() {
return new ArrayList<FileNotFoundException>();
}
Correct Answer: A,D 🗳️
Explanation: Only visible for Fast2test members. You can sign-up / login (it's free).
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 Fast2test members. You can sign-up / login (it's free).
Given:
java
Integer frenchRevolution = 1789;
Object o1 = new String("1789");
Object o2 = frenchRevolution;
frenchRevolution = null;
Object o3 = o2.toString();
System.out.println(o1.equals(o3));
What is printed?
- A. A ClassCastException is thrown.
- B. false
- C. Compilation fails.
- D. true
- E. A NullPointerException is thrown.
Correct Answer: D 🗳️
Explanation: Only visible for Fast2test members. You can sign-up / login (it's free).
Which of the following methods of java.util.function.Predicate aredefault methods?
- A. and(Predicate<? super T> other)
- B. not(Predicate<? super T> target)
- C. or(Predicate<? super T> other)
- D. negate()
- E. isEqual(Object targetRef)
- F. test(T t)
Correct Answer: A,C,D 🗳️
Explanation: Only visible for Fast2test 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. An exception is thrown at runtime
- B. Numbers from 1 to 25 sequentially
- C. Compilation fails
- D. Numbers from 1 to 25 randomly
- E. Numbers from 1 to 1945 randomly
Correct Answer: D 🗳️
Explanation: Only visible for Fast2test members. You can sign-up / login (it's free).
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