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Updated: Sep 13, 2026
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Oracle 1z0-830 Exam Overview:
| Certification Vendor: | Oracle |
|---|---|
| Exam Name: | Java SE 21 Developer Professional |
| Exam Number: | 1Z0-830 |
| Exam Format: | Multiple Choice |
| Exam Duration: | 120 minutes |
| Passing Score: | 68% |
| Exam Price: | $245 USD |
| Available Languages: | English |
| Real Exam Qty: | 50 |
| Related Certifications: | Oracle Certified Professional: Java SE 21 Developer |
| Sample Questions: | Oracle 1z0-830 Sample Questions |
| 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 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Collections and Generics | - Use List, Set, Map, Queue, and Deque implementations - Use sequenced collections and maps - Apply generics and bounded types |
| Object-Oriented Programming | - Create and use classes, interfaces, enums, and records - Apply inheritance and polymorphism - Implement encapsulation and abstraction |
| Annotations and JDBC | - Use built-in and custom annotations - Execute SQL operations and process results - Connect to databases using JDBC |
| Java I/O and NIO | - Use Path, Files, and related APIs - Read and write files - Process file system resources |
| Modules and Packaging | - Package and deploy applications - Create and use Java modules - Manage dependencies and exports |
| Controlling Program Flow | - Use switch expressions and pattern matching - Work with records and sealed classes - Apply decision statements and loops |
| Java Concurrency | - Work with concurrent collections and executors - Create and manage threads - Use virtual threads |
| Functional Programming | - Work with functional interfaces - Use lambda expressions and method references - Process data using Stream API |
| Exception Handling | - Use try-with-resources - Create custom exceptions - Handle checked and unchecked exceptions |
| Handling Date, Time, Text, Numeric and Boolean Values | - Use date, time, duration, period, and localization APIs - Use String, StringBuilder, and related APIs - Work with primitive wrappers and number formatting |
Oracle Java SE 21 Developer Professional Sample Questions:
Given:
java
var _ = 3;
var $ = 7;
System.out.println(_ + $);
What is printed?
- A. _$
- B. It throws an exception.
- C. 10
- D. Compilation fails.
Explanation: Only visible for Easy4Engine members. You can sign-up / login (it's free).
Given:
java
Runnable task1 = () -> System.out.println("Executing Task-1");
Callable<String> task2 = () -> {
System.out.println("Executing Task-2");
return "Task-2 Finish.";
};
ExecutorService execService = Executors.newCachedThreadPool();
// INSERT CODE HERE
execService.awaitTermination(3, TimeUnit.SECONDS);
execService.shutdownNow();
Which of the following statements, inserted in the code above, printsboth:
"Executing Task-2" and "Executing Task-1"?
- A. execService.submit(task2);
- B. execService.run(task1);
- C. execService.execute(task1);
- D. execService.call(task1);
- E. execService.submit(task1);
- F. execService.call(task2);
- G. execService.run(task2);
- H. execService.execute(task2);
Explanation: Only visible for Easy4Engine members. You can sign-up / login (it's free).
Given:
java
public class SpecialAddition extends Addition implements Special {
public static void main(String[] args) {
System.out.println(new SpecialAddition().add());
}
int add() {
return --foo + bar--;
}
}
class Addition {
int foo = 1;
}
interface Special {
int bar = 1;
}
What is printed?
- A. 1
- B. It throws an exception at runtime.
- C. 0
- D. 2
- E. Compilation fails.
Explanation: Only visible for Easy4Engine members. You can sign-up / login (it's free).
Given:
java
public class Test {
public static void main(String[] args) throws IOException {
Path p1 = Path.of("f1.txt");
Path p2 = Path.of("f2.txt");
Files.move(p1, p2);
Files.delete(p1);
}
}
In which case does the given program throw an exception?
- A. File f1.txt exists while file f2.txt doesn't
- B. Both files f1.txt and f2.txt exist
- C. Neither files f1.txt nor f2.txt exist
- D. File f2.txt exists while file f1.txt doesn't
- E. An exception is always thrown
Explanation: Only visible for Easy4Engine members. You can sign-up / login (it's free).
Given:
java
double amount = 42_000.00;
NumberFormat format = NumberFormat.getCompactNumberInstance(Locale.FRANCE, NumberFormat.Style.
SHORT);
System.out.println(format.format(amount));
What is the output?
- A. 42 k
- B. 42000
- C. 42 000,00 €
- D. 42000E
Explanation: Only visible for Easy4Engine members. You can sign-up / login (it's free).
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