Oracle 1z0-830 Questions & Answers - in .pdf
- Total Q&A: 85
- Update: Aug 26, 2026
- Price: $59.99
- Vendor: Oracle
- Exam Code: 1z0-830
- Exam Name: Java SE 21 Developer Professional
- Features:
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- Exact Oracle 1z0-830 Exam Questions with Correct Answers, verified by Experts with years of Experience in IT Field.
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Oracle 1z0-830 Q&A - Testing Engine
- Total Q&A: 85
- Update: Aug 26, 2026
- Price: $59.99
- Vendor: Oracle
- Exam Code: 1z0-830
- Exam Name: Java SE 21 Developer Professional
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Oracle 1z0-830 Exam Overview:
| Certification Vendor: | Oracle |
|---|---|
| Exam Name: | Oracle Java SE 21 Developer Professional |
| Exam Number: | 1Z0-830 |
| Exam Price: | USD 245 (may vary by region) |
| Related Certifications: | Oracle Certified Professional: Java SE 11 Developer Oracle Certified Professional: Java SE 17 Developer |
| Exam Duration: | 90 minutes |
| Certificate Validity Period: | Does not expire |
| Real Exam Qty: | 50-60 |
| Available Languages: | English, Japanese |
| Passing Score: | 68% |
| Exam Format: | Multiple Choice, Drag and Drop, Multiple Response |
| 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 |
|---|---|
| Topic 1: Object-Oriented Programming | - Core OOP principles
|
| Topic 2: Concurrency and Multithreading | - Thread management
|
| Topic 3: Java Language Fundamentals | - Java syntax and language structure
|
| Topic 4: Database Connectivity (JDBC) | - Database interaction
|
| Topic 5: Exception Handling and Debugging | - Error handling mechanisms
|
| Topic 6: Core APIs | - Java standard library usage
|
| Topic 7: Input/Output and File Handling | - NIO and file operations
|
| Topic 8: Advanced Java Features (Java SE 21) | - Modern language features
|
Oracle Java SE 21 Developer Professional Sample Questions:
Question 1
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(task2);
B. execService.execute(task2);
C. execService.submit(task1);
D. execService.run(task2);
E. execService.execute(task1);
F. execService.run(task1);
G. execService.call(task1);
H. execService.submit(task2);
Question 2
Given:
java
LocalDate localDate = LocalDate.of(2020, 8, 8);
Date date = java.sql.Date.valueOf(localDate);
DateFormat formatter = new SimpleDateFormat(/* pattern */);
String output = formatter.format(date);
System.out.println(output);
It's known that the given code prints out "August 08".
Which of the following should be inserted as the pattern?
A. MM d
B. MMM dd
C. MM dd
D. MMMM dd
Question 3
Which of the following statements are correct?
A. You can use 'protected' access modifier with all kinds of classes
B. You can use 'final' modifier with all kinds of classes
C. You can use 'private' access modifier with all kinds of classes
D. None
E. You can use 'public' access modifier with all kinds of classes
Question 4
Given:
java
sealed class Vehicle permits Car, Bike {
}
non-sealed class Car extends Vehicle {
}
final class Bike extends Vehicle {
}
public class SealedClassTest {
public static void main(String[] args) {
Class<?> vehicleClass = Vehicle.class;
Class<?> carClass = Car.class;
Class<?> bikeClass = Bike.class;
System.out.print("Is Vehicle sealed? " + vehicleClass.isSealed() +
"; Is Car sealed? " + carClass.isSealed() +
"; Is Bike sealed? " + bikeClass.isSealed());
}
}
What is printed?
A. Is Vehicle sealed? true; Is Car sealed? true; Is Bike sealed? true
B. Is Vehicle sealed? false; Is Car sealed? false; Is Bike sealed? false
C. Is Vehicle sealed? false; Is Car sealed? true; Is Bike sealed? true
D. Is Vehicle sealed? true; Is Car sealed? false; Is Bike sealed? false
Question 5
Given:
java
interface A {
default void ma() {
}
}
interface B extends A {
static void mb() {
}
}
interface C extends B {
void ma();
void mc();
}
interface D extends C {
void md();
}
interface E extends D {
default void ma() {
}
default void mb() {
}
default void mc() {
}
}
Which interface can be the target of a lambda expression?
A. A
B. E
C. None of the above
D. B
E. D
F. C
Solutions:
| Question 1 Answer: C,H | Question 2 Answer: D | Question 3 Answer: D | Question 4 Answer: D | Question 5 Answer: C |
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