Purchase Oracle : 1z0-830 Exam Materials and then pass exam easily
Updated: Oct 20, 2026
No. of Questions: 85 Questions & Answers with Testing Engine
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Oracle 1z0-830 Exam Overview:
| Certification Vendor: | Oracle |
|---|---|
| Exam Name: | Oracle Java SE 21 Developer Professional |
| Exam Number: | 1Z0-830 |
| Passing Score: | 68% |
| Real Exam Qty: | 50-60 |
| Exam Price: | USD 245 (may vary by region) |
| Certificate Validity Period: | Does not expire |
| Exam Duration: | 90 minutes |
| Related Certifications: | Oracle Certified Professional: Java SE 11 Developer Oracle Certified Professional: Java SE 17 Developer |
| Exam Format: | Drag and Drop, Multiple Choice, Multiple Response |
| Available Languages: | Japanese, English |
| Recommended Training: | Oracle University Java SE 21 Training |
| Exam Registration: | Oracle Certification Registration |
| Sample Questions: | Oracle 1z0-830 Sample Questions |
| Exam Way: | Online proctored or test center-based exam |
| Pre Condition: | No strict prerequisite, but prior Java programming experience recommended |
| Official Syllabus URL: | https://education.oracle.com |
Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Concurrency and Multithreading | - Thread management
|
| Advanced Java Features (Java SE 21) | - Modern language features
|
| Exception Handling and Debugging | - Error handling mechanisms
|
| Database Connectivity (JDBC) | - Database interaction
|
| Object-Oriented Programming | - Core OOP principles
|
| Input/Output and File Handling | - NIO and file operations
|
| Core APIs | - Java standard library usage
|
| Java Language Fundamentals | - Java syntax and language structure
|
Oracle Java SE 21 Developer Professional Sample Questions:
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.call(task1);
- B. execService.submit(task2);
- C. execService.execute(task2);
- D. execService.submit(task1);
- E. execService.run(task1);
- F. execService.call(task2);
- G. execService.execute(task1);
- H. execService.run(task2);
Correct Answer: B,D 🗳️
Explanation: Only visible for Pass4SureQuiz 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 2 only
- C. Line 3 only
- D. Line 2 and line 3
- E. Line 1 and line 3
- F. The program successfully compiles
- G. Line 1 only
Correct Answer: F 🗳️
Explanation: Only visible for Pass4SureQuiz members. You can sign-up / login (it's free).
Given:
java
StringBuilder result = Stream.of("a", "b")
.collect(
() -> new StringBuilder("c"),
StringBuilder::append,
(a, b) -> b.append(a)
);
System.out.println(result);
What is the output of the given code fragment?
- A. abc
- B. cacb
- C. cbca
- D. bac
- E. bca
- F. cba
- G. acb
Correct Answer: F 🗳️
Explanation: Only visible for Pass4SureQuiz members. You can sign-up / login (it's free).
Given:
java
final Stream<String> strings =
Files.readAllLines(Paths.get("orders.csv"));
strings.skip(1)
.limit(2)
.forEach(System.out::println);
And that the orders.csv file contains:
mathematica
OrderID,Customer,Product,Quantity,Price
1,Kylian Mbappe,Keyboard,2,25.50
2,Teddy Riner,Mouse,1,15.99
3,Sebastien Loeb,Monitor,1,199.99
4,Antoine Griezmann,Headset,3,45.00
What is printed?
- A. An exception is thrown at runtime.
- B. arduino
1,Kylian Mbappe,Keyboard,2,25.50
2,Teddy Riner,Mouse,1,15.99
3,Sebastien Loeb,Monitor,1,199.99
4,Antoine Griezmann,Headset,3,45.00 - C. arduino
1,Kylian Mbappe,Keyboard,2,25.50
2,Teddy Riner,Mouse,1,15.99 - D. Compilation fails.
- E. arduino
2,Teddy Riner,Mouse,1,15.99
3,Sebastien Loeb,Monitor,1,199.99
Correct Answer: A,D 🗳️
Explanation: Only visible for Pass4SureQuiz members. You can sign-up / login (it's free).
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 1 1
- B. 2 1 1
- C. 1 1 2
- D. An exception is thrown.
- E. 2 1 2
- F. 1 2 1
- G. 2 2 1
- H. 1 2 2
- I. 2 2 2
Correct Answer: H 🗳️
Explanation: Only visible for Pass4SureQuiz members. You can sign-up / login (it's free).
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