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Oracle 1z0-830 Q&A - in .pdf
- Exam Code: 1z0-830
- Exam Name: Java SE 21 Developer Professional
- Updated: Sep 29, 2026
- Q & A: 85 Questions and Answers
- Convenient, easy to study.
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- Updated: Sep 29, 2026
- Q & A: 85 Questions and Answers
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- Exam Code: 1z0-830
- Exam Name: Java SE 21 Developer Professional
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- Q & A: 85 Questions and Answers
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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Object-Oriented Programming | - Core OOP principles
|
| Topic 2: Java Language Fundamentals | - Java syntax and language structure
|
| Topic 3: Input/Output and File Handling | - NIO and file operations
|
| Topic 4: Database Connectivity (JDBC) | - Database interaction
|
| Topic 5: Advanced Java Features (Java SE 21) | - Modern language features
|
| Topic 6: Concurrency and Multithreading | - Thread management
|
| Topic 7: Core APIs | - Java standard library usage
|
| Topic 8: Exception Handling and Debugging | - Error handling mechanisms
|
Oracle Java SE 21 Developer Professional Sample Questions:
Question #1
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 package is defined in both a named module and the unnamed module, then the package in the unnamed module is ignored.
- C. The unnamed module exports all of its packages.
- D. We must add a module descriptor to make an application developed using a Java version prior to SE9 run on Java 11.
- E. 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.
- F. Code in an explicitly named module can access types in the unnamed module.
Correct Answer: B,C,E 🗳️
Explanation: Only visible for PracticeDump members. You can sign-up / login (it's free).
Question #2
Given:
java
public class Versailles {
int mirrorsCount;
int gardensHectares;
void Versailles() { // n1
this.mirrorsCount = 17;
this.gardensHectares = 800;
System.out.println("Hall of Mirrors has " + mirrorsCount + " mirrors."); System.out.println("The gardens cover " + gardensHectares + " hectares.");
}
public static void main(String[] args) {
var castle = new Versailles(); // n2
}
}
What is printed?
- A. An exception is thrown at runtime.
- B. Nothing
- C. nginx
Hall of Mirrors has 17 mirrors.
The gardens cover 800 hectares. - D. Compilation fails at line n2.
- E. Compilation fails at line n1.
Correct Answer: E 🗳️
Explanation: Only visible for PracticeDump members. You can sign-up / login (it's free).
Question #3
Given:
java
interface Calculable {
long calculate(int i);
}
public class Test {
public static void main(String[] args) {
Calculable c1 = i -> i + 1; // Line 1
Calculable c2 = i -> Long.valueOf(i); // Line 2
Calculable c3 = i -> { throw new ArithmeticException(); }; // Line 3
}
}
Which lines fail to compile?
- A. Line 1 and line 2
- B. Line 2 and line 3
- C. Line 3 only
- D. The program successfully compiles
- E. Line 1 only
- F. Line 2 only
- G. Line 1 and line 3
Correct Answer: D 🗳️
Explanation: Only visible for PracticeDump members. You can sign-up / login (it's free).
Question #4
Given:
java
Stream<String> strings = Stream.of("United", "States");
BinaryOperator<String> operator = (s1, s2) -> s1.concat(s2.toUpperCase()); String result = strings.reduce("-", operator); System.out.println(result); What is the output of this code fragment?
- A. -UnitedSTATES
- B. -UNITEDSTATES
- C. United-STATES
- D. UnitedStates
- E. -UnitedStates
- F. UNITED-STATES
- G. United-States
Correct Answer: A 🗳️
Explanation: Only visible for PracticeDump 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. 1 2 2
- B. 2 2 1
- C. 1 2 1
- D. An exception is thrown.
- E. 1 1 2
- F. 1 1 1
- G. 2 1 2
- H. 2 2 2
- I. 2 1 1
Correct Answer: A 🗳️
Explanation: Only visible for PracticeDump members. You can sign-up / login (it's free).
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