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- Total Questions: 85
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Oracle 1z1-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Core APIs | - Java standard library usage
|
| Topic 2: Java Language Fundamentals | - Java syntax and language structure
|
| Topic 3: Exception Handling and Debugging | - Error handling mechanisms
|
| Topic 4: Concurrency and Multithreading | - Thread management
|
| Topic 5: Input/Output and File Handling | - NIO and file operations
|
| Topic 6: Database Connectivity (JDBC) | - Database interaction
|
| Topic 7: Object-Oriented Programming | - Core OOP principles
|
| Topic 8: Advanced Java Features (Java SE 21) | - Modern language features
|
Oracle Java SE 21 Developer Professional Sample Questions:
Given:
java
ExecutorService service = Executors.newFixedThreadPool(2);
Runnable task = () -> System.out.println("Task is complete");
service.submit(task);
service.shutdown();
service.submit(task);
What happens when executing the given code fragment?
- A. It prints "Task is complete" twice and throws an exception.
- B. It prints "Task is complete" once and throws an exception.
- C. It prints "Task is complete" once, then exits normally.
- D. It exits normally without printing anything to the console.
- E. It prints "Task is complete" twice, then exits normally.
Correct Answer: B 🗳️
Explanation: Only visible for NewPassLeader members. You can sign-up / login (it's free).
Given:
java
CopyOnWriteArrayList<String> list = new CopyOnWriteArrayList<>();
list.add("A");
list.add("B");
list.add("C");
// Writing in one thread
new Thread(() -> {
list.add("D");
System.out.println("Element added: D");
}).start();
// Reading in another thread
new Thread(() -> {
for (String element : list) {
System.out.println("Read element: " + element);
}
}).start();
What is printed?
- A. It prints all elements, including changes made during iteration.
- B. It prints all elements, but changes made during iteration may not be visible.
- C. Compilation fails.
- D. It throws an exception.
Correct Answer: B 🗳️
Explanation: Only visible for NewPassLeader 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. The final keyword in its declaration must go right before the class keyword.
- D. It cannot implement any interface.
- E. It cannot extend another class.
Correct Answer: A 🗳️
Explanation: Only visible for NewPassLeader members. You can sign-up / login (it's free).
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? true; Is Bike sealed? true
- C. Is Vehicle sealed? true; Is Car sealed? false; Is Bike sealed? false
- D. Is Vehicle sealed? false; Is Car sealed? false; Is Bike sealed? false
Correct Answer: C 🗳️
Explanation: Only visible for NewPassLeader 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. 0
- C. 2
- D. It throws an exception at runtime.
- E. Compilation fails.
Correct Answer: E 🗳️
Explanation: Only visible for NewPassLeader members. You can sign-up / login (it's free).
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