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- Total Questions: 85
- Updated on: Sep 15, 2026
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- Total Questions: 85
- Updated on: Sep 15, 2026
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- Total Questions: 85
- Updated on: Sep 15, 2026
- Price: $69.98
You can review the approach before you buy. Actual4dump offers a free PDF demo for Oracle Java SE 21 Developer Professional, letting you sample the 1z1-830 practice material and see how the 85-question set is presented in 2026.
Oracle 1z1-830 Exam Overview:
| Certification Vendor: | Oracle |
|---|---|
| Exam Name: | Java SE 21 Developer Professional |
| Exam Number: | 1Z0-830 |
| Real Exam Qty: | 50 |
| Exam Price: | $245 USD |
| Related Certifications: | Oracle Certified Professional: Java SE 21 Developer |
| Available Languages: | English |
| Passing Score: | 68% |
| Exam Duration: | 120 minutes |
| Exam Format: | Multiple Choice |
| Sample Questions: | DOWNLOAD DEMO |
| Exam Way: | Online proctored exam or in-person at Pearson VUE testing centers. |
| Pre Condition: | No mandatory prerequisite certification. Recommended experience with Java programming and modern Java SE features. |
| Official Syllabus URL: | https://education.oracle.com/java-se-21-developer-professional/pexam_1Z0-830 |
Oracle 1z1-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Exception Handling | - Handle checked and unchecked exceptions - Create custom exceptions - Use try-with-resources |
| Topic 2: Object-Oriented Programming | - Apply inheritance and polymorphism - Implement encapsulation and abstraction - Create and use classes, interfaces, enums, and records |
| Topic 3: Functional Programming | - Work with functional interfaces - Process data using Stream API - Use lambda expressions and method references |
| Topic 4: Collections and Generics | - Use List, Set, Map, Queue, and Deque implementations - Use sequenced collections and maps - Apply generics and bounded types |
| Topic 5: Java I/O and NIO | - Use Path, Files, and related APIs - Read and write files - Process file system resources |
| Topic 6: Modules and Packaging | - Package and deploy applications - Create and use Java modules - Manage dependencies and exports |
| Topic 7: Java Concurrency | - Work with concurrent collections and executors - Use virtual threads - Create and manage threads |
| Topic 8: Handling Date, Time, Text, Numeric and Boolean Values | - Use String, StringBuilder, and related APIs - Use date, time, duration, period, and localization APIs - Work with primitive wrappers and number formatting |
| Topic 9: Annotations and JDBC | - Use built-in and custom annotations - Execute SQL operations and process results - Connect to databases using JDBC |
| Topic 10: Controlling Program Flow | - Use switch expressions and pattern matching - Apply decision statements and loops - Work with records and sealed classes |
Common Questions About Oracle Java SE 21 Developer Professional
The 1z1-830 exam, Java SE 21 Developer Professional, assesses whether a candidate can apply Oracle knowledge to the skills measured by this credential. It is associated with the Java SE certification. The certification is positioned at the Professional level. Related credentials include Oracle Certified Professional: Java SE 21 Developer.
The 1z1-830 exam includes 50 questions and allows 120 minutes. Plan your pacing before exam day rather than calculating it under pressure. Timed sessions with Actual4dump practice tests can help you decide when to flag a difficult item, keep moving, and reserve enough time for a final review.
The published passing score for Oracle Java SE 21 Developer Professional is 68%, and the official exam fee is $245 USD. A retake requires budgeting for the full official fee again, so it is sensible to complete several timed practice tests before scheduling. Consistent results across the 85 practice questions can give you a clearer picture of your readiness.
The stated prerequisite information for Oracle Java SE 21 Developer Professional is: No mandatory prerequisite certification. Recommended experience with Java programming and modern Java SE features. Before registering, review the eligibility details on the official exam page to confirm the requirements.
Yes. Actual4dump provides a free PDF demo so you can review the format and quality of the Oracle Java SE 21 Developer Professional practice questions before placing an order. Your purchase includes 365 days of free updates, and you can extend the update service after expiration at a 50% discount.
If you take the corresponding 1z1-830 exam within 60 days of purchase and do not pass, you may apply for a full refund under the 100% Money Back Guarantee. Claims based on an exam taken within 3 days of purchase are not eligible; free materials, expired orders, and downloaded products that were not used before sitting for the exam are also excluded. The candidate name must match the payer name.
To apply, submit a scanned enrollment slip and the official Score Report PDF within 2 days after the exam. Eligible requests are processed within 7 days. If you prefer an alternative, you may receive two free products of equal value and keep the update service for your original purchase.
Delivery is instant after payment. Your download is also sent to your email within one minute; if it has not arrived within 2 hours, contact customer service. There is no limit on the number of computers on which the material can be installed.
The published Oracle Java SE 21 Developer Professional outline contains 10 major domains. The opening domains include:
- Exception Handling (official weight not provided)
- Collections and Generics (official weight not provided)
- Java I/O and NIO (official weight not provided)
Review the complete Exam Topics section above for every domain and subtopic before planning your study time.
Oracle Java SE 21 Developer Professional Sample Questions:
Given:
java
void verifyNotNull(Object input) {
boolean enabled = false;
assert enabled = true;
assert enabled;
System.out.println(input.toString());
assert input != null;
}
When does the given method throw a NullPointerException?
- A. Only if assertions are enabled and the input argument is null
- B. Only if assertions are enabled and the input argument isn't null
- C. Only if assertions are disabled and the input argument isn't null
- D. Only if assertions are disabled and the input argument is null
- E. A NullPointerException is never thrown
Correct Answer: D 🗳️
Explanation: Only visible for Actual4dump members. You can sign-up / login (it's free).
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. Nothing
- B. nginx
Hall of Mirrors has 17 mirrors.
The gardens cover 800 hectares. - C. An exception is thrown at runtime.
- D. Compilation fails at line n2.
- E. Compilation fails at line n1.
Correct Answer: E 🗳️
Explanation: Only visible for Actual4dump members. You can sign-up / login (it's free).
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 3 only
- C. Line 2 and line 3
- D. The program successfully compiles
- E. Line 1 and line 3
- F. Line 2 only
- G. Line 1 only
Correct Answer: D 🗳️
Explanation: Only visible for Actual4dump members. You can sign-up / login (it's free).
Given:
java
public class ThisCalls {
public ThisCalls() {
this(true);
}
public ThisCalls(boolean flag) {
this();
}
}
Which statement is correct?
- A. It does not compile.
- B. It throws an exception at runtime.
- C. It compiles.
Correct Answer: A 🗳️
Explanation: Only visible for Actual4dump members. You can sign-up / login (it's free).
Which of the following statements are correct?
- A. None
- B. You can use 'public' access modifier with all kinds of classes
- C. You can use 'protected' access modifier with all kinds of classes
- D. You can use 'private' access modifier with all kinds of classes
- E. You can use 'final' modifier with all kinds of classes
Correct Answer: A 🗳️
Explanation: Only visible for Actual4dump members. You can sign-up / login (it's free).
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