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Updated: Oct 02, 2026
No. of Questions: 85 Questions & Answers
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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Input/Output and File Handling | - NIO and file operations
|
| Object-Oriented Programming | - Core OOP principles
|
| Java Language Fundamentals | - Java syntax and language structure
|
| Core APIs | - Java standard library usage
|
| Database Connectivity (JDBC) | - Database interaction
|
| Exception Handling and Debugging | - Error handling mechanisms
|
| Concurrency and Multithreading | - Thread management
|
| Advanced Java Features (Java SE 21) | - Modern language features
|
Oracle Java SE 21 Developer Professional Sample Questions:
Which two of the following aren't the correct ways to create a Stream?
- A. Stream<String> stream = Stream.builder().add("a").build();
- B. Stream stream = Stream.empty();
- C. Stream stream = new Stream();
- D. Stream stream = Stream.ofNullable("a");
- E. Stream stream = Stream.generate(() -> "a");
- F. Stream stream = Stream.of();
Correct Answer: A,C 🗳️
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. arduino
2,Teddy Riner,Mouse,1,15.99
3,Sebastien Loeb,Monitor,1,199.99 - 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. An exception is thrown at runtime.
- E. Compilation fails.
Correct Answer: D,E 🗳️
Explanation: Only visible for Lead1Pass members. You can sign-up / login (it's free).
Given:
java
var deque = new ArrayDeque<>();
deque.add(1);
deque.add(2);
deque.add(3);
deque.add(4);
deque.add(5);
System.out.print(deque.peek() + " ");
System.out.print(deque.poll() + " ");
System.out.print(deque.pop() + " ");
System.out.print(deque.element() + " ");
What is printed?
- A. 5 5 2 3
- B. 1 1 1 1
- C. 1 1 2 3
- D. 1 5 5 1
- E. 1 1 2 2
Correct Answer: C 🗳️
Explanation: Only visible for Lead1Pass members. You can sign-up / login (it's free).
Which of the following statements is correct about a final class?
- A. It cannot be extended by any other class.
- B. It must contain at least a final method.
- C. It cannot extend another class.
- D. It cannot implement any interface.
- E. The final keyword in its declaration must go right before the class keyword.
Correct Answer: A 🗳️
Explanation: Only visible for Lead1Pass members. You can sign-up / login (it's free).
Which of the following statements are correct?
- A. You can use 'final' modifier with all kinds of classes
- B. You can use 'private' access modifier with all kinds of classes
- C. You can use 'public' access modifier with all kinds of classes
- D. None
- E. You can use 'protected' access modifier with all kinds of classes
Correct Answer: D 🗳️
Explanation: Only visible for Lead1Pass members. You can sign-up / login (it's free).
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